F22D

PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION

FEED-WATER SUPPLY FOR STEAM GENERATION

CONTROLLING WATER LEVEL FOR STEAM GENERATION

AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS

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.

F22D1/00

Feed-water heaters, i.e. economisers or like preheaters

F22D1/003

Feed-water heater systems F22D1/325, F22D1/36 and F22D1/40 take precedence

F22D1/006

with heating tubes F22D1/24 takes precedence

F22D1/02

with water tubes arranged in the boiler furnace, fire tubes, or flue ways heat-exchange tubes in general F28F

F22D1/04

the tubes having plain outer surfaces, e.g. in vertical arrangement

F22D1/06

in horizontal arrangement

F22D1/08

the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement

F22D1/10

in horizontal arrangement hollow fire-bars, grates, or the like used as water tubes F23H3/02

F22D1/12

Control devices, e.g. for regulating steam temperature

F22D1/14

Safety or venting devices safety devices for boilers in general F22B37/42

F22D1/16

with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways

F22D1/18

and heated indirectly

F22D1/20

and directly connected to boilers

F22D1/22

and provided for rotary movements

F22D1/24

with fire tubes or flue ways traversing feed-water vessels

F22D1/26

with means, other than tubes, to separate water and heating medium, e.g. bulk heaters without internal flues or tubes, jacketted smoke-boxes or flue or flues

F22D1/28

for direct heat transfer, e.g. by mixing water and steam

F22D1/30

with stages, steps, baffles, dishes, circular troughs, or other means to cause interrupted or cascading fall of water de-aeration apparatus C02F

F22D1/32

arranged to be heated by steam, e.g. bled from turbines

F22D1/325

Schematic arrangements or control devices therefor

F22D1/34

and returning condensate to boiler with main feed supply

F22D1/36

Water and air preheating systems

F22D1/38

Constructional features of water and air preheating systems

F22D1/40

Combinations of exhaust-steam and smoke-gas preheaters for locomotives F22D1/42

F22D1/42

specially adapted for locomotives

F22D1/44

Smoke-gas preheaters

F22D1/46

Exhaust-steam preheaters

F22D1/48

Details

F22D1/50

incorporating thermal de-aeration of feed-water de-aeration produced in the course of direct heat transfer F22D1/28; thermal de-aeration of water per se B01D19/00, C02F1/20; valves for venting F16K24/04

F22D3/00

Accumulators for preheated water

F22D3/02

arranged within combustion chambers

F22D3/04

combined with steam accumulators

F22D3/06

directly connected to boilers

F22D3/08

specially adapted for locomotives locomotives boilers F22B13/06

F22D3/10

Control devices controlling water feed to boilers, or water level F22D5/00

F22D5/00

Controlling water feed or water level

Automatic water feeding or water-level regulators steam traps F16T; measuring or indicating instruments G01; for indicating water level G01F; level control in general G05D9/00

F22D5/02

with an intermediate compartment from which the water is fed by gravity after mechanically moving the compartment, the movement being controlled according to water level

F22D5/04

with pivoting buckets

F22D5/06

with receptacles external to, but in free communication with, the boilers and adapted to move up and down in accordance with change in water level

F22D5/08

with float-actuated valves

F22D5/10

and with pistons or membranes unitary with the feed inlet valves

F22D5/12

and with dipping tubes

F22D5/14

responsive to thermal expansion and contraction, e.g. of solid elements

F22D5/16

of fluids

F22D5/18

for varying the speed or delivery pressure of feed pumps

F22D5/20

without floats

F22D5/22

with floats

F22D5/24

with electric switches

F22D5/26

Automatic feed-control systems automatic safety devices F22B37/42; controlling in general G05

F22D5/28

responsive to amount of steam withdrawn

responsive to steam pressure

F22D5/30

responsive to both water level and amount of steam withdrawn or steam pressure

F22D5/32

influencing the speed or delivery pressure of the feed pumps

F22D5/34

Applications of valves valves per se

F16K

F22D5/36

for feeding a number of steam boilers designed for different ranges of temperature and pressure

F22D7/00

Auxiliary devices for promoting water circulation adaptation of boilers for promoting water circulation F22B37/34

F22D7/02

Saddles or like directing plates fitted to furnace tubes

F22D7/04

Injectors for water or steam

F22D7/06

Rotary devices, e.g. propellers

F22D7/08

Arrangements of pumps, e.g. outside the boilers

F22D7/10

within the boilers

F22D7/12

Control devices

F22D7/14

specially adapted for locomotive boilers

F22D11/00

Feed-water supply not provided for in other main groups

F22D11/003

Emergency feed-water supply safety devices for boilers in general F22B37/42

F22D11/006

Arrangements of feedwater cleaning with a boiler

F22D11/02

Arrangements of feed-water pumps F22D11/06 takes precedence; pumps per se

F04

F22D11/04

with means to eliminate steam formation

F22D11/06

for returning condensate to boiler