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357 lines
196 KiB
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357 lines
196 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
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<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="F22B" definition-exists="true" date-revised="2018-08-01" status="published"><classification-symbol>F22B</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>METHODS OF STEAM GENERATION</text></title-part><title-part><text>STEAM BOILERS </text><reference><text>steam engine plants where engine aspects predominate <class-ref scheme="cpc">F01K</class-ref>; domestic central-heating systems using steam <class-ref scheme="cpc">F24D</class-ref>; heat exchange or heat transfer in general <class-ref scheme="cpc">F28</class-ref>; generation of vapour in the cores of nuclear reactors <class-ref scheme="cpc">G21</class-ref></text></reference></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph>This subclass <u>covers</u> only methods of, or apparatus for, the generation of steam under pressure for heating or power purposes</note-paragraph></note><note type="warning"><note-paragraph>In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.</note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="F22B1/00" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>General aspects of, or methods for, steam generation</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B1/00" definition-exists="true" ipc-concordant="F22B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-05-01" status="published"><classification-symbol>F22B1/00</classification-symbol><class-title date-revised="2018-05-01"><title-part><text>Methods of steam generation characterised by form of heating method </text><reference><text>solar heating <class-ref scheme="cpc">F24S</class-ref>; jackets or other cooling means in which steam is generated and which serve for cooling other apparatus, see the subclasses for such apparatus</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B1/003" definition-exists="false" ipc-concordant="F22B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using combustion of hydrogen with oxygen </text><reference><text>power plants using steam created by combustion of hydrogen with oxygen <class-ref scheme="cpc">F01K25/005</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B1/006" definition-exists="false" ipc-concordant="F22B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-05-01" status="published"><classification-symbol>F22B1/006</classification-symbol><class-title date-revised="2018-05-01"><title-part><CPC-specific-text><text>using solar heat </text><reference><text>solar heat collectors <u>per se</u> <class-ref scheme="cpc">F24S</class-ref>; devices for producing mechanical power from solar energy <class-ref scheme="cpc">F03G6/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B1/02" definition-exists="false" ipc-concordant="F22B1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by exploitation of the heat content of hot heat carriers</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/021" definition-exists="false" ipc-concordant="F22B1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with heating tubes in which flows a non-specified heating fluid </text><reference><text>for nuclear reactors <class-ref scheme="cpc">F22B1/023</class-ref>, for hot gas <class-ref scheme="cpc">F22B1/1884</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/023" definition-exists="false" ipc-concordant="F22B1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with heating tubes, for nuclear reactors as far as they are not classified, according to a specified heating fluid, in another group</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/025" definition-exists="false" ipc-concordant="F22B1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with vertical U shaped tubes carried on a horizontal tube sheet</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/026" definition-exists="false" ipc-concordant="F22B1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with vertical tubes between to horizontal tube sheets</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/028" definition-exists="false" ipc-concordant="F22B1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Steam generation using heat accumulators </text><reference><text><class-ref scheme="cpc">F22B27/14</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/04" definition-exists="false" ipc-concordant="F22B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the heat carrier being hot slag, hot residues, or heated blocks, e.g. iron blocks</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/06" definition-exists="false" ipc-concordant="F22B1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the heat carrier being molten</text></title-part><title-part><text>Use of molten metal, e.g. zinc, as heat transfer medium</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/063" definition-exists="false" ipc-concordant="F22B1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for metal cooled nuclear reactors </text><reference><text>heat-exchangers having a liquid metal as heat exchange medium <class-ref scheme="not-mapped">F28D7/00C</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B1/066" definition-exists="false" ipc-concordant="F22B1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/066</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with double-wall tubes having a third fluid between these walls, e.g. helium for leak detection </text><reference><text>heat-exchangers with double-wall tubes <class-ref scheme="cpc">F28D7/10</class-ref>; double-wall pipes <u>per se</u> <class-ref scheme="cpc">F16L9/18</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/08" definition-exists="false" ipc-concordant="F22B1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the heat carrier being steam</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/10" definition-exists="false" ipc-concordant="F22B1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>released from heat accumulators</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/12" definition-exists="false" ipc-concordant="F22B1/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>produced by an indirect cyclic process</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B1/123" definition-exists="false" ipc-concordant="F22B1/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/123</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Steam generators downstream of a nuclear boiling water reactor</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B1/126" definition-exists="false" ipc-concordant="F22B1/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/126</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Steam generators of the Schmidt-Hartmann type</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/14" definition-exists="false" ipc-concordant="F22B1/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>coming in direct contact with water in bulk or in sprays</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B1/143" definition-exists="false" ipc-concordant="F22B1/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/143</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in combination with a nuclear installation</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B1/146" definition-exists="false" ipc-concordant="F22B1/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/146</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Loffler boilers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/16" definition-exists="false" ipc-concordant="F22B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/162" definition-exists="false" ipc-concordant="F22B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/162</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in combination with a nuclear installation</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/165" definition-exists="false" ipc-concordant="F22B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/165</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using heat pipes </text><reference><text>heat pipes <u>per se</u> <class-ref scheme="cpc">F28D15/02</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/167" definition-exists="false" ipc-concordant="F22B1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/167</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using an organic fluid</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/18" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines </text><reference><text>use of waste heat of combustion engines, in general, <class-ref scheme="cpc">F02G</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/1807" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/1807</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using the exhaust gases of combustion engines</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B1/1815" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/1815</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using the exhaust gases of gas-turbines</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/1823" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/1823</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for gas-cooled nuclear reactors</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/183" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/183</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in combination with metallurgical converter installations</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/1838" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/1838</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the hot gas being under a high pressure, e.g. in chemical installations</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B1/1846" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/1846</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the hot gas being loaded with particles, e.g. waste heat boilers after a coal gasification plant</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/1853" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/1853</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>coming in direct contact with water in bulk or in sprays</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/1861" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/1861</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Waste heat boilers with supplementary firing</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/1869" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/1869</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hot gas water tube boilers not provided for in <class-ref scheme="cpc">F22B1/1807</class-ref> - <class-ref scheme="cpc">F22B1/1861</class-ref></text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B1/1876" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/1876</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the hot gas being loaded with particles, e.g. dust </text><reference><text>with the hot gas being under high pressure <class-ref scheme="cpc">F22B1/1846</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/1884" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/1884</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hot gas heating tube boilers with one or more heating tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/1892" definition-exists="false" ipc-concordant="F22B1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>F22B1/1892</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>Systems therefor not provided for in <class-ref scheme="cpc">F22B1/1807</class-ref> - <class-ref scheme="cpc">F22B1/1861</class-ref></text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B1/20" definition-exists="false" ipc-concordant="F22B1/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using heat evolved in a solution absorbing steam</text></title-part><title-part><text>Soda steam boilers</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B1/22" definition-exists="false" ipc-concordant="F22B1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using combustion under pressure substantially exceeding atmospheric pressure</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/24" definition-exists="false" ipc-concordant="F22B1/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pressure-fired steam boilers, e.g. using turbo-air compressors actuated by hot gases from boiler furnace</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/26" definition-exists="false" ipc-concordant="F22B1/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>F22B1/26</classification-symbol><class-title date-revised="2016-08-01"><title-part><text>Steam boilers of submerged-flame type, i.e. the flame being surrounded by, or impinging on, the water to be vaporised </text><CPC-specific-text><text>, e.g. water in sprays</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/265" definition-exists="false" ipc-concordant="F22B1/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/265</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the water being in bulk</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B1/28" definition-exists="false" ipc-concordant="F22B1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in boilers heated electrically </text><CPC-specific-text><reference><text>superheating using an electrical heat source independent from heat supply of the steam boiler <class-ref scheme="cpc">F22G1/165</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/281" definition-exists="false" ipc-concordant="F22B1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/281</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>other than by electrical resistances or electrodes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/282" definition-exists="false" ipc-concordant="F22B1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/282</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with water or steam circulating in tubes or ducts</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/284" definition-exists="false" ipc-concordant="F22B1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/284</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with water in reservoirs</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/285" definition-exists="false" ipc-concordant="F22B1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/285</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the water being fed by a pump to the reservoirs</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/287" definition-exists="false" ipc-concordant="F22B1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/287</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with water in sprays or in films</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/288" definition-exists="false" ipc-concordant="F22B1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/288</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Instantaneous electrical steam generators built-up from heat-exchange elements arranged within a confined chamber having heat-retaining walls</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B1/30" definition-exists="false" ipc-concordant="F22B1/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Electrode boilers</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B1/303" definition-exists="false" ipc-concordant="F22B1/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/303</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with means for injecting or spraying water against electrodes or with means for water circulation</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B1/306" definition-exists="false" ipc-concordant="F22B1/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B1/306</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with at least one electrode permanently above the water surface</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B3/00" definition-exists="true" ipc-concordant="F22B3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B3/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Other methods of steam generation</text></title-part><title-part><text>Steam boilers not provided for in other groups of this subclass</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B3/02" definition-exists="false" ipc-concordant="F22B3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B3/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving the use of working media other than water</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B3/04" definition-exists="false" ipc-concordant="F22B3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B3/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators </text><reference><text>steam accumulators <u>per se</u> <class-ref scheme="cpc">F01K1/00</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B3/045" definition-exists="false" ipc-concordant="F22B3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B3/045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the drop in pressure being achieved by compressors, e.g. with steam jet pumps</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B3/06" definition-exists="false" ipc-concordant="F22B3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B3/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by transformation of mechanical, e.g. kinetic, energy into heat energy</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B3/08" definition-exists="false" ipc-concordant="F22B3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B3/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>at critical or supercritical pressure values</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="F22B5/00" date-revised="2013-01-01" status="published"><classification-symbol>F22B5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Kinds of steam boilers</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B5/00" definition-exists="true" ipc-concordant="F22B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Steam boilers of drum type, i.e. without internal furnace or fire tubes, the boiler body being contacted externally by flue gas</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B5/005" definition-exists="false" ipc-concordant="F22B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B5/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with rotating drums</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B5/02" definition-exists="false" ipc-concordant="F22B5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with auxiliary water tubes outside the boiler body</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B5/04" definition-exists="false" ipc-concordant="F22B5/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B5/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Component parts thereof</text></title-part><title-part><text>Accessories therefor </text><reference><text>covers or similar closure members <class-ref scheme="cpc">F16J13/00</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B7/00" definition-exists="true" ipc-concordant="F22B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed inside one or more furnace tubes built-in in the boiler body</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B7/02" definition-exists="false" ipc-concordant="F22B7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B7/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>without auxiliary water tubes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B7/04" definition-exists="false" ipc-concordant="F22B7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B7/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with auxiliary water tubes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B7/06" definition-exists="false" ipc-concordant="F22B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B7/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>inside the furnace tube in transverse arrangements</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B7/08" definition-exists="false" ipc-concordant="F22B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B7/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>inside the furnace tube in longitudinal arrangement</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B7/10" definition-exists="false" ipc-concordant="F22B7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B7/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>outside the boiler body</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B7/12" definition-exists="false" ipc-concordant="F22B7/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B7/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with auxiliary fire tubes</text></title-part><title-part><text>Arrangement of header boxes providing for return diversion of flue gas flow</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B7/14" definition-exists="false" ipc-concordant="F22B7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B7/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with both auxiliary water tubes and auxiliary fire tubes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B7/16" definition-exists="false" ipc-concordant="F22B7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B7/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Component parts thereof</text></title-part><title-part><text>Accessories therefor, e.g. stay-bolt connections</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B7/18" definition-exists="false" ipc-concordant="F22B7/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B7/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Walling of flues</text></title-part><title-part><text>Flue gas header boxes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B7/20" definition-exists="false" ipc-concordant="F22B7/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B7/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Furnace tubes</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B9/00" definition-exists="true" ipc-concordant="F22B9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B9/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B9/02" definition-exists="false" ipc-concordant="F22B9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B9/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the boiler body being disposed upright, e.g. above the combustion chamber</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B9/04" definition-exists="false" ipc-concordant="F22B9/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B9/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the fire tubes being in upright arrangement</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B9/06" definition-exists="false" ipc-concordant="F22B9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B9/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangement of header boxes providing for return diversion of flue gas flow</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B9/08" definition-exists="false" ipc-concordant="F22B9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B9/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the fire tubes being in horizontal arrangement</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B9/10" definition-exists="false" ipc-concordant="F22B9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B9/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the boiler body being disposed substantially horizontally, e.g. at the side of the combustion chamber</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B9/12" definition-exists="false" ipc-concordant="F22B9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B9/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the fire tubes being in substantially horizontal arrangement</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B9/14" definition-exists="false" ipc-concordant="F22B9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B9/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangement of header boxes providing for return diversion of flue gas flow</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B9/16" definition-exists="false" ipc-concordant="F22B9/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B9/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the boiler body containing fire tubes disposed crosswise in inclined upward arrangement</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B9/18" definition-exists="false" ipc-concordant="F22B9/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B9/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Component parts thereof</text></title-part><title-part><text>Accessories therefor, e.g. stay-bolt connections</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B11/00" definition-exists="true" ipc-concordant="F22B11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B11/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Steam boilers of combined fire-tube type and water-tube type, i.e. steam boilers of fire-tube type having auxiliary water tubes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B11/02" definition-exists="false" ipc-concordant="F22B11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B11/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the fire tubes being in upright arrangement</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B11/04" definition-exists="false" ipc-concordant="F22B11/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B11/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the fire tubes being in horizontal arrangement</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B13/00" definition-exists="true" ipc-concordant="F22B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Steam boilers of fire-box type, i.e. the combustion of fuel being performed in a chamber or fire-box with subsequent flue(s) or fire tube(s), both chamber or fire-box and flues or fire tubes being built-in in the boiler body</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B13/005" definition-exists="false" ipc-concordant="F22B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with flues, other than fire tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B13/02" definition-exists="false" ipc-concordant="F22B13/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>mounted in fixed position with the boiler body disposed upright</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B13/023" definition-exists="false" ipc-concordant="F22B13/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with auxiliary water tubes inside the fire-box, e.g. vertical tubes </text><reference><text><class-ref scheme="cpc">F22B13/10</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B13/026" definition-exists="false" ipc-concordant="F22B13/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the tubes being in substantially horizontal arrangement</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B13/04" definition-exists="false" ipc-concordant="F22B13/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>mounted in fixed position with the boiler body disposed substantially horizontally</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B13/06" definition-exists="false" ipc-concordant="F22B13/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Locomobile, traction-engine, steam-roller, or locomotive boilers</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B13/065" definition-exists="false" ipc-concordant="F22B13/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Combination of low and high pressure locomotive boilers</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B13/08" definition-exists="false" ipc-concordant="F22B13/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>without auxiliary water tubes inside the fire-box</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B13/10" definition-exists="false" ipc-concordant="F22B13/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with auxiliary water tubes inside the fire-box</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B13/12" definition-exists="false" ipc-concordant="F22B13/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the auxiliary water tubes lining the fire-box</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B13/14" definition-exists="false" ipc-concordant="F22B13/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Component parts thereof</text></title-part><title-part><text>Accessories therefor</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B13/145" definition-exists="false" ipc-concordant="F22B13/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/145</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Firebox thermosiphons</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B13/16" definition-exists="false" ipc-concordant="F22B13/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Stay-bolt connections, e.g. rigid connections</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B13/18" definition-exists="false" ipc-concordant="F22B13/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B13/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Flexible connections, e.g. of ball-and-socket type</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B15/00" definition-exists="true" ipc-concordant="F22B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B15/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Water-tube boilers of horizontal type, i.e. the water-tube sets being arranged horizontally</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B17/00" definition-exists="true" ipc-concordant="F22B17/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Water-tube boilers of horizontally-inclined type, e.g. the water-tube sets being inclined slightly with respect to the horizontal plane</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B17/02" definition-exists="false" ipc-concordant="F22B17/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>built-up from water-tube sets in abutting connection with two header boxes in common for all sets, e.g. with flat header boxes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B17/025" definition-exists="false" ipc-concordant="F22B17/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with combined inlet and outlet header boxes, e.g. connected by U-tubes or Field tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B17/04" definition-exists="false" ipc-concordant="F22B17/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the water-tube sets being inclined in opposite directions, e.g. crosswise</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B17/06" definition-exists="false" ipc-concordant="F22B17/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the water-tube sets being bent angularly</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B17/08" definition-exists="false" ipc-concordant="F22B17/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the water-tube sets being curved</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B17/10" definition-exists="false" ipc-concordant="F22B17/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>built-up from water-tube sets in abutting connection with two sectional headers each for every set, i.e. with headers in a number of sections across the width or height of the boiler</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B17/105" definition-exists="false" ipc-concordant="F22B17/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/105</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with tubes in series flow arrangement</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B17/12" definition-exists="false" ipc-concordant="F22B17/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the sectional headers being in vertical or substantially vertical arrangement</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B17/14" definition-exists="false" ipc-concordant="F22B17/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the sectional headers being in horizontal or substantially horizontal arrangement</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B17/16" definition-exists="false" ipc-concordant="F22B17/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Component parts thereof</text></title-part><title-part><text>Accessories therefor</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B17/18" definition-exists="false" ipc-concordant="F22B17/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B17/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Header boxes</text></title-part><title-part><text>Sectional headers</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B19/00" definition-exists="true" ipc-concordant="F22B19/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B19/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Water-tube boilers of combined horizontally-inclined type and vertical type, i.e. water-tube boilers of horizontally-inclined type having auxiliary water-tube sets in vertical or substantially vertical arrangement</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B21/00" definition-exists="true" ipc-concordant="F22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B21/002" definition-exists="false" ipc-concordant="F22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a single upper drum </text><reference><text><class-ref scheme="cpc">F22B21/36</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B21/005" definition-exists="false" ipc-concordant="F22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a central vertical drum, header or downcomer</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B21/007" definition-exists="false" ipc-concordant="F22B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for locomotives</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B21/02" definition-exists="false" ipc-concordant="F22B21/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>built-up from substantially straight water tubes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/04" definition-exists="false" ipc-concordant="F22B21/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving a single upper drum and a single lower drum, e.g. the drums being arranged transversely</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B21/06" definition-exists="false" ipc-concordant="F22B21/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the water tubes being arranged annularly in sets, e.g. in abutting connection with drums of annular shape</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B21/065" definition-exists="false" ipc-concordant="F22B21/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving an upper and lower drum of annular shape</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B21/08" definition-exists="false" ipc-concordant="F22B21/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the water tubes being arranged sectionally in groups or in banks, e.g. bent over at their ends</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B21/081" definition-exists="false" ipc-concordant="F22B21/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a combustion chamber, placed at the side and built-up from water tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B21/083" definition-exists="false" ipc-concordant="F22B21/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/083</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving an upper drum and a lower drum and a fire-place between the two drums</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B21/085" definition-exists="false" ipc-concordant="F22B21/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/085</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the tubes being placed in layers</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B21/086" definition-exists="false" ipc-concordant="F22B21/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Frames built-up from water tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B21/088" definition-exists="false" ipc-concordant="F22B21/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/088</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving an upper drum and a lower drum and two lateral drums</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B21/10" definition-exists="false" ipc-concordant="F22B21/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the water tubes being arranged in staggered rows</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/12" definition-exists="false" ipc-concordant="F22B21/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving two or more upper drums and two or more lower drums, e.g. with crosswise-arranged water-tube sets in abutting connections with drums</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B21/123" definition-exists="false" ipc-concordant="F22B21/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/123</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving crossed water tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B21/126" definition-exists="false" ipc-concordant="F22B21/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/126</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving more than two lower or upper drums</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/14" definition-exists="false" ipc-concordant="F22B21/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving a single upper drum and two or more lower drums</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B21/16" definition-exists="false" ipc-concordant="F22B21/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the lower drums being interconnected by further water tubes</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/18" definition-exists="false" ipc-concordant="F22B21/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving two or more upper drums and a single lower drum</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B21/185" definition-exists="false" ipc-concordant="F22B21/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/185</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving more than two upper drums and a single lower drum</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/20" definition-exists="false" ipc-concordant="F22B21/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving sectional or subdivided headers in separate arrangement for each water-tube set</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B21/22" definition-exists="false" ipc-concordant="F22B21/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>built-up from water tubes of form other than straight or substantially straight</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/24" definition-exists="false" ipc-concordant="F22B21/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>bent in serpentine or sinuous form</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/26" definition-exists="false" ipc-concordant="F22B21/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>bent helically, i.e. coiled</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/28" definition-exists="false" ipc-concordant="F22B21/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>bent spirally</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/30" definition-exists="false" ipc-concordant="F22B21/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>bent in U-loop form</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B21/32" definition-exists="false" ipc-concordant="F22B21/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>disposed horizontally in abutting connection with upright headers or rising water mains</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B21/34" definition-exists="false" ipc-concordant="F22B21/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/341" definition-exists="false" ipc-concordant="F22B21/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/341</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Vertical radiation boilers with combustion in the lower part</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B21/343" definition-exists="false" ipc-concordant="F22B21/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/343</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the vertical radiation combustion chamber being connected at its upper part to a sidewards convection chamber</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B21/345" definition-exists="false" ipc-concordant="F22B21/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/345</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a tube bundle between an upper and a lower drum in the convection pass</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/346" definition-exists="false" ipc-concordant="F22B21/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/346</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Horizontal radiation boilers</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/348" definition-exists="false" ipc-concordant="F22B21/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/348</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Radiation boilers with a burner at the top</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/36" definition-exists="false" ipc-concordant="F22B21/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/36</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving an upper drum or headers mounted at the top of the combustion chamber</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B21/363" definition-exists="false" ipc-concordant="F22B21/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/363</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a horizontal drum mounted in an upper corner of the boiler</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B21/366" definition-exists="false" ipc-concordant="F22B21/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/366</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a horizontal drum mounted in the middle of the boiler</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B21/38" definition-exists="false" ipc-concordant="F22B21/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Component parts thereof, e.g. prefabricated panels</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B21/40" definition-exists="false" ipc-concordant="F22B21/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B21/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>built-up from water tubes arranged in a comparatively long vertical shaft, i.e. tower boilers</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B23/00" definition-exists="true" ipc-concordant="F22B23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B23/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Water-tube boilers built-up from sets of spaced double-walled water tubes of return type in unilateral abutting connection with a boiler drum or with a header box, i.e. built-up from Field water tubes comprising an inner tube arranged within an outer unilaterally-closed tube</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B23/02" definition-exists="false" ipc-concordant="F22B23/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B23/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the water-tube, i.e. Field-tube, sets being horizontal or substantially horizontal</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B23/04" definition-exists="false" ipc-concordant="F22B23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B23/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the water-tube, i.e. Field-tube, sets being vertical or substantially vertical</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B23/06" definition-exists="false" ipc-concordant="F22B23/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B23/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Component parts thereof, e.g. Field water tubes </text><reference><text>heat-exchange tubes in general <class-ref scheme="cpc">F28F</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B25/00" definition-exists="true" ipc-concordant="F22B25/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B25/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Water-tube boilers built-up from sets of water tubes with internally-arranged flue tubes, or fire tubes, extending through the water tubes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B27/00" definition-exists="true" ipc-concordant="F22B27/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B27/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Instantaneous or flash steam boilers</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B27/02" definition-exists="false" ipc-concordant="F22B27/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B27/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>built-up from fire tubes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B27/04" definition-exists="false" ipc-concordant="F22B27/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>F22B27/04</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>built-up from water tubes </text><reference><text><class-ref scheme="cpc">F22B27/12</class-ref> - <class-ref scheme="cpc">F22B27/16</class-ref> take precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B27/06" definition-exists="false" ipc-concordant="F22B27/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B27/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>bent in serpentine or sinuous form</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B27/08" definition-exists="false" ipc-concordant="F22B27/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B27/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>bent helically, i.e. coiled</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B27/10" definition-exists="false" ipc-concordant="F22B27/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B27/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>bent spirally</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B27/12" definition-exists="false" ipc-concordant="F22B27/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B27/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>built-up from rotary heat-exchange elements, e.g. from tube assemblies</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B27/14" definition-exists="false" ipc-concordant="F22B27/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B27/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>built-up from heat-exchange elements arranged within a confined chamber having heat-retaining walls </text><CPC-specific-text><reference><text><class-ref scheme="cpc">F22B1/288</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B27/16" definition-exists="false" ipc-concordant="F22B27/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B27/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving spray nozzles for sprinkling or injecting water particles on to or into hot heat-exchange elements, e.g. into tubes </text><CPC-specific-text><reference><text><class-ref scheme="cpc">F22B1/287</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B27/165" definition-exists="false" ipc-concordant="F22B27/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B27/165</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with film flow of water on heated surfaces</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B29/00" definition-exists="true" ipc-concordant="F22B29/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Steam boilers of forced-flow type</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B29/02" definition-exists="false" ipc-concordant="F22B29/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of forced-circulation type </text><CPC-specific-text><reference><text><class-ref scheme="cpc">F22B29/06</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B29/023" definition-exists="false" ipc-concordant="F22B29/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>without drums, i.e. without hot water storage in the boiler</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B29/026" definition-exists="false" ipc-concordant="F22B29/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>operating at critical or supercritical pressure</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B29/04" definition-exists="false" ipc-concordant="F22B29/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of combined-circulation type, i.e. in which convection circulation due to the difference in specific gravity between cold and hot water is promoted by additional measures, e.g. by injecting pressure-water temporarily</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B29/06" definition-exists="false" ipc-concordant="F22B29/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes </text><reference><text><class-ref scheme="cpc">F22B33/00</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B29/061" definition-exists="false" ipc-concordant="F22B29/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/061</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Construction of tube walls</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B29/062" definition-exists="false" ipc-concordant="F22B29/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/062</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving vertically-disposed water tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B29/064" definition-exists="false" ipc-concordant="F22B29/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/064</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving horizontally- or helically-disposed water tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B29/065" definition-exists="false" ipc-concordant="F22B29/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving upper vertically disposed water tubes and lower horizontally- or helically disposed water tubes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B29/067" definition-exists="false" ipc-concordant="F22B29/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/067</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>operating at critical or supercritical pressure </text><reference><text>with recirculation during normal operation <class-ref scheme="cpc">F22B29/026</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B29/068" definition-exists="false" ipc-concordant="F22B29/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>operating with superimposed recirculation during normal operation </text><reference><text><class-ref scheme="cpc">F22B29/12</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B29/08" definition-exists="false" ipc-concordant="F22B29/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>operating with fixed point of final state of complete evaporation </text><CPC-specific-text><reference><text>evaporation or evaporation apparatus for physical or chemical purposes, e.g. evaporation of liquids for gas phase reactions <class-ref scheme="cpc">B01B1/005</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B29/10" definition-exists="false" ipc-concordant="F22B29/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>operating with sliding point of final state of complete evaporation </text><CPC-specific-text><reference><text>evaporation or evaporation apparatus for physical or chemical purposes, e.g. evaporation of liquids for gas phase reactions <class-ref scheme="cpc">B01B1/005</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B29/12" definition-exists="false" ipc-concordant="F22B29/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B29/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>operating with superimposed recirculation during starting and low-load periods, e.g. composite boilers</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B31/00" definition-exists="true" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus</text></title-part><title-part><text>Arrangements of dispositions of combustion apparatus </text><reference><text>steam generation characterised by heating method <class-ref scheme="cpc">F22B1/00</class-ref>; combustion apparatus <u>per se</u> <class-ref scheme="cpc">F23</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B31/0007" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/0007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with combustion in a fluidized bed </text><reference><text>fluidized bed apparatus <u>per se</u> <class-ref scheme="cpc">B01J8/00</class-ref>; fluidized bed combustors <class-ref scheme="cpc">F23C10/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B31/0015" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/0015</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for boilers of the water tube type</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B31/0023" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/0023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with tubes in the bed </text><reference><text><class-ref scheme="cpc">F22B31/003</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B31/003" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with tubes surrounding the bed or with water tube wall partitions</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B31/0038" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/0038</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with tubes in the bed</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B31/0046" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/0046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for boilers of the shell type, e.g. with furnace box</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B31/0053" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/0053</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with auxiliary water tubes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B31/0061" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/0061</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Constructional features of bed cooling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B31/0069" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/0069</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Systems therefor</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B31/0076" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/0076</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling processes for fluidized bed boilers not related to a particular type</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B31/0084" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/0084</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with recirculation of separated solids or with cooling of the bed particles outside the combustion bed</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B31/0092" definition-exists="false" ipc-concordant="F22B31/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/0092</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a fluidized heat exchange bed and a fluidized combustion bed separated by a partition, the bed particles circulating around or through that partition</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B31/02" definition-exists="false" ipc-concordant="F22B31/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Installation of water-tube boilers in chimneys, e.g. in converter chimneys</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B31/04" definition-exists="false" ipc-concordant="F22B31/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Heat supply by installation of two or more combustion apparatus, e.g. of separate combustion apparatus for the boiler and the superheater respectively</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B31/045" definition-exists="false" ipc-concordant="F22B31/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Steam generators specially adapted for burning refuse</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B31/06" definition-exists="false" ipc-concordant="F22B31/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Installation of emergency heat supply</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B31/08" definition-exists="false" ipc-concordant="F22B31/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B31/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="F22B33/00" date-revised="2013-01-01" status="published"><classification-symbol>F22B33/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Steam-generation plants</text></title-part><title-part><text>Control systems</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B33/00" definition-exists="true" ipc-concordant="F22B33/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B33/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Steam-generation plants, e.g. comprising steam boilers of different types in mutual association </text><reference><text>arrangements or dispositions of steam-generation plants in marine vessels <class-ref scheme="cpc">B63H21/00</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B33/02" definition-exists="false" ipc-concordant="F22B33/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B33/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Combinations of boilers having a single combustion apparatus in common</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B33/04" definition-exists="false" ipc-concordant="F22B33/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B33/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of boilers of furnace-tube type with boilers of water-tube type</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B33/06" definition-exists="false" ipc-concordant="F22B33/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B33/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of boilers of furnace-tube type with boilers of fire-tube type</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B33/08" definition-exists="false" ipc-concordant="F22B33/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B33/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of boilers of water tube type with boilers of fire-tube type</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B33/10" definition-exists="false" ipc-concordant="F22B33/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B33/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of two or more superposed boilers with separate water volumes and operating with two or more separate water levels</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B33/12" definition-exists="false" ipc-concordant="F22B33/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B33/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Self-contained steam boilers, i.e. comprising as a unit the steam boiler, the combustion apparatus, the fuel storage, accessory machines and equipment</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B33/14" definition-exists="false" ipc-concordant="F22B33/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>F22B33/14</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Combinations of low and high pressure boilers </text><reference><text><class-ref scheme="cpc">F22B13/065</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B33/16" definition-exists="false" ipc-concordant="F22B33/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B33/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of forced-flow type</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B33/18" definition-exists="false" ipc-concordant="F22B33/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B33/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Combinations of steam boilers with other apparatus</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B33/185" definition-exists="false" ipc-concordant="F22B33/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B33/185</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in combination with a steam accumulator</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B35/00" definition-exists="true" ipc-concordant="F22B35/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Control systems for steam boilers </text><reference><CPC-specific-text><text>for fluidized bed boilers <class-ref scheme="cpc">F22B31/0076</class-ref>;</text></CPC-specific-text><text> regulation or control of steam power plants <class-ref scheme="cpc">F01K7/00</class-ref>; for regulating feed-water supply <class-ref scheme="cpc">F22D</class-ref>; for controlling superheat temperature <class-ref scheme="cpc">F22G5/00</class-ref>; control of combustion <class-ref scheme="cpc">F23N</class-ref>; regulating or controlling in general <class-ref scheme="cpc">G05</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B35/001" definition-exists="false" ipc-concordant="F22B35/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling by flue gas dampers </text><reference><text>for superheaters <class-ref scheme="cpc">F22G5/04</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B35/002" definition-exists="false" ipc-concordant="F22B35/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control by recirculating flue gases </text><reference><text>for superheaters <class-ref scheme="cpc">F22G5/06</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B35/004" definition-exists="false" ipc-concordant="F22B35/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control systems for steam generators of nuclear power plants</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B35/005" definition-exists="false" ipc-concordant="F22B35/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control systems for instantaneous steam boilers</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B35/007" definition-exists="false" ipc-concordant="F22B35/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control systems for waste heat boilers</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B35/008" definition-exists="false" ipc-concordant="F22B35/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control systems for two or more steam generators </text><reference><text><class-ref scheme="cpc">F22D5/36</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B35/02" definition-exists="false" ipc-concordant="F22B35/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for steam boilers with natural convection circulation</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B35/04" definition-exists="false" ipc-concordant="F22B35/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>during starting-up periods, i.e. during the periods between the lighting of the furnaces and the attainment of the normal operating temperature of the steam boilers</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B35/06" definition-exists="false" ipc-concordant="F22B35/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for steam boilers of forced-flow type</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B35/08" definition-exists="false" ipc-concordant="F22B35/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of forced-circulation type</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B35/083" definition-exists="false" ipc-concordant="F22B35/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/083</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>without drum, i.e. without hot water storage in the boiler</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B35/086" definition-exists="false" ipc-concordant="F22B35/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>operating at critical or supercritical pressure</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B35/10" definition-exists="false" ipc-concordant="F22B35/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of once-through type</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B35/101" definition-exists="false" ipc-concordant="F22B35/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/101</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>operating with superimposed recirculation during starting or low load periods, e.g. composite boilers </text><reference><text><class-ref scheme="cpc">F22B35/125</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B35/102" definition-exists="false" ipc-concordant="F22B35/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/102</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>operating with fixed point of final state of complete evaporation, e.g. in a steam-water separator</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B35/104" definition-exists="false" ipc-concordant="F22B35/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/104</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control systems by injecting water </text><reference><text>for superheaters <class-ref scheme="cpc">F22G5/12</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B35/105" definition-exists="false" ipc-concordant="F22B35/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/105</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>operating at sliding pressure</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B35/107" definition-exists="false" ipc-concordant="F22B35/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/107</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control systems with auxiliary heating surfaces</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B35/108" definition-exists="false" ipc-concordant="F22B35/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/108</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control systems for steam generators having multiple flow paths</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B35/12" definition-exists="false" ipc-concordant="F22B35/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>operating at critical or supercritical pressure</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B35/125" definition-exists="false" ipc-concordant="F22B35/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/125</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>operating with superimposed recirculation during starting or low load periods, e.g. composite boilers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B35/14" definition-exists="false" ipc-concordant="F22B35/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>during the starting-up periods, i.e. during the periods between the lighting of the furnaces and the attainment of the normal operating temperature of the steam boilers</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B35/16" definition-exists="false" ipc-concordant="F22B35/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B35/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>responsive to the percentage of steam in the mixture of steam and water</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B35/18" definition-exists="false" ipc-concordant="F22B35/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>F22B35/18</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Applications of computers to steam boiler control</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="F22B37/00" definition-exists="true" ipc-concordant="F22B37/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Component parts or details of steam boilers </text><reference><text>venting devices <class-ref scheme="cpc">F16K24/00</class-ref>; steam traps or like apparatus <class-ref scheme="cpc">F16T</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B37/001" definition-exists="false" ipc-concordant="F22B37/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Steam generators built-up from pre-fabricated elements</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B37/002" definition-exists="false" ipc-concordant="F22B37/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for nuclear steam generators, e.g. maintenance, repairing or inspecting equipment not otherwise provided for</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/003" definition-exists="false" ipc-concordant="F22B37/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Maintenance, repairing or inspecting equipment positioned in or via the headers</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/005" definition-exists="false" ipc-concordant="F22B37/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Positioning apparatus specially adapted therefor </text><reference><text><class-ref scheme="cpc">F22B37/64</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/006" definition-exists="false" ipc-concordant="F22B37/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Walking equipment, e.g. walking platforms suspended at the tube sheet </text><reference><text>walking mechanism <u>per se</u> <class-ref scheme="cpc">B62D57/02</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/007" definition-exists="false" ipc-concordant="F22B37/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Installation or removal of nuclear steam generators</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B37/008" definition-exists="false" ipc-concordant="F22B37/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Adaptations for flue gas purification in steam generators, </text><reference><text>flue gas purification in general <class-ref scheme="cpc">F23J</class-ref>; gas purification in general <class-ref scheme="cpc">B01D</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B37/02" definition-exists="false" ipc-concordant="F22B37/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>applicable to more than one kind or type of steam boiler</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/025" definition-exists="false" ipc-concordant="F22B37/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Devices and methods for diminishing corrosion, e.g. by preventing cooling beneath the dew point</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/04" definition-exists="false" ipc-concordant="F22B37/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>and characterised by material, e.g. use of special steel alloy</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/06" definition-exists="false" ipc-concordant="F22B37/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Flue or fire tubes</text></title-part><title-part><text>Accessories therefor, e.g. fire-tube inserts</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/08" definition-exists="false" ipc-concordant="F22B37/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Fittings preventing burning-off of the tube edges</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/10" definition-exists="false" ipc-concordant="F22B37/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Water tubes</text></title-part><title-part><text>Accessories therefor </text><reference><text>working of metal tubes <class-ref scheme="cpc">B21D</class-ref>; pipes in general <class-ref scheme="cpc">F16L</class-ref>; repairing leaks in water tubes <class-ref scheme="cpc">F16L55/16</class-ref>; <class-ref scheme="cpc">F28F11/00</class-ref>; baffles, screens, or deflectors formed of water tubes <class-ref scheme="cpc">F23M9/10</class-ref>; cleaning internal or external surfaces of water tubes <class-ref scheme="cpc">F28G</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/101" definition-exists="false" ipc-concordant="F22B37/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/101</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tubes having fins or ribs</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/102" definition-exists="false" ipc-concordant="F22B37/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/102</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Walls built-up from finned tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/103" definition-exists="false" ipc-concordant="F22B37/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/103</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Internally ribbed tubes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/104" definition-exists="false" ipc-concordant="F22B37/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/104</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Connection of tubes one with the other or with collectors, drums or distributors </text><reference><text>in general <class-ref scheme="cpc">F16L</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/105" definition-exists="false" ipc-concordant="F22B37/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/105</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Penetrations of tubes through a wall and their sealing </text><reference><text>in general <class-ref scheme="cpc">F16L5/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/106" definition-exists="false" ipc-concordant="F22B37/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/106</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Studding of tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/107" definition-exists="false" ipc-concordant="F22B37/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/107</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Protection of water tubes </text><reference><text>in general <class-ref scheme="cpc">F16L57/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/108" definition-exists="false" ipc-concordant="F22B37/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/108</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Protection of water tube walls</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/12" definition-exists="false" ipc-concordant="F22B37/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Forms of water tubes, e.g. of varying cross-section</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/125" definition-exists="false" ipc-concordant="F22B37/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/125</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bifurcates</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/14" definition-exists="false" ipc-concordant="F22B37/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Supply mains, e.g. rising mains, down-comers, in connection with water tubes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/141" definition-exists="false" ipc-concordant="F22B37/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/141</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving vertically-disposed water tubes, e.g. walls built-up from vertical tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/142" definition-exists="false" ipc-concordant="F22B37/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/142</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving horizontally-or helically-disposed water tubes, e.g. walls built-up from horizontal or helical tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/143" definition-exists="false" ipc-concordant="F22B37/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/143</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Panel shaped heating surfaces built up from tubes </text><reference><text><class-ref scheme="cpc">F22B37/145</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/145" definition-exists="false" ipc-concordant="F22B37/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/145</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Flag-shaped panels built-up from tubes, e.g. from U-shaped tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/146" definition-exists="false" ipc-concordant="F22B37/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/146</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tube arrangements for ash hoppers and grates and for combustion chambers of the cyclone or similar type out of the flues</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/147" definition-exists="false" ipc-concordant="F22B37/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/147</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tube arrangements for cooling orifices, doors and burners</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/148" definition-exists="false" ipc-concordant="F22B37/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/148</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tube arrangements for the roofs</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/16" definition-exists="false" ipc-concordant="F22B37/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Return bends</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/165" definition-exists="false" ipc-concordant="F22B37/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/165</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Closures for access openings in return bends </text><reference><text>boiler plugs for drums or headers <class-ref scheme="cpc">F22B37/223</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/18" definition-exists="false" ipc-concordant="F22B37/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Inserts, e.g. for receiving deposits from water</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/20" definition-exists="false" ipc-concordant="F22B37/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Supporting arrangements, e.g. for securing water-tube sets </text><reference><text>construction of tube walls of furnaces including boiler furnaces <class-ref scheme="cpc">F23M5/08</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/201" definition-exists="false" ipc-concordant="F22B37/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/201</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Suspension and securing arrangements for walls built-up from tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/202" definition-exists="false" ipc-concordant="F22B37/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/202</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Suspension and securing arrangements for contact heating surfaces</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="F22B37/203" definition-exists="false" ipc-concordant="F22B37/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/203</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Horizontal tubes supported only away from their ends on vertical support tubes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/204" definition-exists="false" ipc-concordant="F22B37/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/204</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Supporting arrangements for individual tubes, e.g. for securing tubes to a refractory wall</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/205" definition-exists="false" ipc-concordant="F22B37/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Supporting and spacing arrangements for tubes of a tube bundle</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="F22B37/206" definition-exists="false" ipc-concordant="F22B37/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/206</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Anti-vibration supports for the bends of U-tube steam generators</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/207" definition-exists="false" ipc-concordant="F22B37/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/207</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Supporting arrangements for drums and collectors</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/208" definition-exists="false" ipc-concordant="F22B37/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/208</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Backstay arrangements</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/22" definition-exists="false" ipc-concordant="F22B37/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Drums</text></title-part><title-part><text>Headers</text></title-part><title-part><text>Accessories therefor </text><reference><text>making boilers from sheet metal <class-ref scheme="cpc">B21D51/24</class-ref>; pressure vessels in general <class-ref scheme="cpc">F16J12/00</class-ref>; covers or similar closure members <class-ref scheme="cpc">F16J13/00</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/221" definition-exists="false" ipc-concordant="F22B37/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/221</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Covers for drums, collectors, manholes or the like </text><reference><text>in general <class-ref scheme="cpc">F16J13/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/222" definition-exists="false" ipc-concordant="F22B37/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/222</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Nozzle dams introduced through a smaller manway, e.g. foldable</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/223" definition-exists="false" ipc-concordant="F22B37/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/223</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Boiler plugs, e.g. for handholes </text><reference><text>closures for access openings in return bends <class-ref scheme="cpc">F22B37/165</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/225" definition-exists="false" ipc-concordant="F22B37/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/225</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements on drums or collectors for fixing tubes or for connecting collectors to each other</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/226" definition-exists="false" ipc-concordant="F22B37/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/226</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Protection of drums against combustion</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/227" definition-exists="false" ipc-concordant="F22B37/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/227</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Drums and collectors for mixing</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/228" definition-exists="false" ipc-concordant="F22B37/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/228</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Headers for distributing feedwater into steam generator vessels; Accessories therefor</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/24" definition-exists="false" ipc-concordant="F22B37/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Supporting, suspending, or setting arrangements, e.g. heat shielding </text><reference><text>frames, engine beds <class-ref scheme="cpc">F16M</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/242" definition-exists="false" ipc-concordant="F22B37/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/242</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for bottom supported water-tube steam generators</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/244" definition-exists="false" ipc-concordant="F22B37/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/244</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for water-tube steam generators suspended from the top</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/246" definition-exists="false" ipc-concordant="F22B37/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/246</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for steam generators of the reservoir type, e.g. nuclear steam generators</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/248" definition-exists="false" ipc-concordant="F22B37/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/248</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a vertical cylindrical wall</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/26" definition-exists="false" ipc-concordant="F22B37/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Steam-separating arrangements </text><reference><text>vapour-liquid separators, e.g. for drying steam, <class-ref scheme="cpc">B01D</class-ref>; <class-ref scheme="cpc">B04</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/261" definition-exists="false" ipc-concordant="F22B37/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/261</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for boiler drums</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/263" definition-exists="false" ipc-concordant="F22B37/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/263</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Valves with water separators</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/265" definition-exists="false" ipc-concordant="F22B37/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/265</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Apparatus for washing and purifying steam</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/266" definition-exists="false" ipc-concordant="F22B37/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/266</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Separator reheaters</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/268" definition-exists="false" ipc-concordant="F22B37/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/268</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for steam generators of nuclear power plants</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/28" definition-exists="false" ipc-concordant="F22B37/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving reversal of direction of flow</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/283" definition-exists="false" ipc-concordant="F22B37/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/283</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for boiler drums</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/286" definition-exists="false" ipc-concordant="F22B37/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/286</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for steam generators of nuclear power plants</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/30" definition-exists="false" ipc-concordant="F22B37/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using impingement against baffle separators</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/303" definition-exists="false" ipc-concordant="F22B37/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/303</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for boiler drums</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/306" definition-exists="false" ipc-concordant="F22B37/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/306</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for steam generators of nuclear power plants</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/32" definition-exists="false" ipc-concordant="F22B37/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using centrifugal force</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/322" definition-exists="false" ipc-concordant="F22B37/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/322</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for boiler drums</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/325" definition-exists="false" ipc-concordant="F22B37/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/325</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a revolving element</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/327" definition-exists="false" ipc-concordant="F22B37/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/327</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for steam generators of nuclear power plants</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/34" definition-exists="false" ipc-concordant="F22B37/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Adaptations of boilers for promoting water circulation </text><reference><CPC-specific-text><text><class-ref scheme="cpc">F22B13/145</class-ref> takes precedence </text></CPC-specific-text><text>; auxiliary devices for promoting water circulation <class-ref scheme="cpc">F22D7/00</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/36" definition-exists="false" ipc-concordant="F22B37/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/36</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for sheathing or casing boilers</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/365" definition-exists="false" ipc-concordant="F22B37/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/365</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Casings of metal sheets, e.g. expansion plates, expansible joints</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/38" definition-exists="false" ipc-concordant="F22B37/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes </text><reference><text>measuring or indicating instruments in general <class-ref scheme="cpc">G01</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/40" definition-exists="false" ipc-concordant="F22B37/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles </text><reference><text>in flues or chimneys <class-ref scheme="cpc">F23J13/00</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/42" definition-exists="false" ipc-concordant="F22B37/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>F22B37/42</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Applications, arrangements, or dispositions of alarm or automatic safety devices </text><reference><text>for feed-water heaters <class-ref scheme="cpc">F22D1/14</class-ref> </text><CPC-specific-text><text>; emergency feed-water supply <class-ref scheme="cpc">F22D11/003</class-ref></text></CPC-specific-text><text>; alarms responsive to undesired or abnormal conditions <class-ref scheme="cpc">G08B</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/421" definition-exists="false" ipc-concordant="F22B37/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/421</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for detecting leaks</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/423" definition-exists="false" ipc-concordant="F22B37/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/423</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Valves for testing steam generators</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/425" definition-exists="false" ipc-concordant="F22B37/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/425</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Feed-water supply alarm devices using floats</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/426" definition-exists="false" ipc-concordant="F22B37/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/426</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Feed-water supply alarm devices using electric signals</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/428" definition-exists="false" ipc-concordant="F22B37/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/428</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Feed-water supply alarm devices using dilatation of solids or liquids</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/44" definition-exists="false" ipc-concordant="F22B37/44" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/44</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of safety valves </text><reference><text>safety valves <u>per se</u> <class-ref scheme="cpc">F16K</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/443" definition-exists="false" ipc-concordant="F22B37/44" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/443</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Safety devices extinguishing the fire</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/446" definition-exists="false" ipc-concordant="F22B37/44" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/446</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Safety devices responsive to overpressure</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/46" definition-exists="false" ipc-concordant="F22B37/46" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/46</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>responsive to low or high water level, e.g. for checking, suppressing, extinguishing combustion in boilers </text><reference><text>fire-fighting, fire extinction in general <class-ref scheme="cpc">A62</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/47" definition-exists="false" ipc-concordant="F22B37/47" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/47</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>responsive to abnormal temperature, e.g. actuated by fusible plugs </text><reference><text>such alarms or devices <u>per se</u> <class-ref scheme="cpc">G08B</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/475" definition-exists="false" ipc-concordant="F22B37/47" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/475</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Safety devices with fusible plugs</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/48" definition-exists="false" ipc-concordant="F22B37/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/48</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Devices for removing water, salt, or sludge from boilers </text><reference><text>cleaning internal or external surfaces of water tubes <class-ref scheme="cpc">F28G</class-ref></text></reference></title-part><title-part><text>Arrangements of cleaning apparatus in boilers </text><reference><text>cleaning external surfaces of tubes by soot blowers <class-ref scheme="cpc">F23J</class-ref></text></reference></title-part><title-part><text>Combinations thereof with boilers</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/483" definition-exists="false" ipc-concordant="F22B37/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/483</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for nuclear steam generators</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/486" definition-exists="false" ipc-concordant="F22B37/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/486</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Devices for removing water, salt, or sludge from boilers </text><reference><text><class-ref scheme="cpc">F22B37/483</class-ref>, <class-ref scheme="cpc">F22B37/50</class-ref>, <class-ref scheme="cpc">F22B37/52</class-ref> and <class-ref scheme="cpc">F22B37/54</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/50" definition-exists="false" ipc-concordant="F22B37/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for draining or expelling water</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/52" definition-exists="false" ipc-concordant="F22B37/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/52</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Washing-out devices</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/54" definition-exists="false" ipc-concordant="F22B37/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/54</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>De-sludging or blow-down devices </text><CPC-specific-text><reference><text><class-ref scheme="cpc">F22B37/565</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="F22B37/545" definition-exists="false" ipc-concordant="F22B37/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/545</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Valves specially adapted therefor </text><reference><text>valves in general <class-ref scheme="cpc">F16K</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/56" definition-exists="false" ipc-concordant="F22B37/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/56</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Boiler cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/565" definition-exists="false" ipc-concordant="F22B37/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/565</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Blow-down control, e.g. for ascertaining proper duration of boiler blow-down</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/58" definition-exists="false" ipc-concordant="F22B37/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/58</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Removing tubes from headers or drums</text></title-part><title-part><text>Extracting tools</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B37/60" definition-exists="false" ipc-concordant="F22B37/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/60</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>specially adapted for steam boilers of instantaneous or flash type</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B37/62" definition-exists="false" ipc-concordant="F22B37/62" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/62</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>specially adapted for steam boilers of forced-flow type</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/64" definition-exists="false" ipc-concordant="F22B37/64" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/64</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Mounting of, or supporting arrangements for, tube units </text><reference><text>construction of tube walls of furnaces, e.g. boiler furnaces <class-ref scheme="cpc">F23M5/08</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/645" definition-exists="false" ipc-concordant="F22B37/64" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/645</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving upper vertically-disposed water tubes and lower horizontally- or helically disposed water tubes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/66" definition-exists="false" ipc-concordant="F22B37/66" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/66</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving vertically-disposed water tubes </text><reference><text><class-ref scheme="cpc">F22B37/645</class-ref> takes precedence</text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/68" definition-exists="false" ipc-concordant="F22B37/68" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/68</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving horizontally-disposed water tubes </text><reference><text><class-ref scheme="cpc">F22B37/645</class-ref> takes precedence</text></reference></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="F22B37/70" definition-exists="false" ipc-concordant="F22B37/70" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/70</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements for distributing water into water tubes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/72" definition-exists="false" ipc-concordant="F22B37/72" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/72</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>involving injection devices</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="F22B37/74" definition-exists="false" ipc-concordant="F22B37/74" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/74</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Throttling arrangements for tubes or sets of tubes</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B37/76" definition-exists="false" ipc-concordant="F22B37/76" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/76</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Adaptations or mounting of devices for observing existence or direction of fluid flow </text><reference><text>devices <u>per se</u> <class-ref scheme="cpc">G01P</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="F22B37/78" definition-exists="false" ipc-concordant="F22B37/78" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>F22B37/78</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Adaptations or mounting of level indicators </text><reference><text>level indicators <u>per se</u> <class-ref scheme="cpc">G01F</class-ref></text></reference></title-part></class-title></classification-item></classification-item></classification-item></classification-item></class-scheme> |