F28GCLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS cleaning pipes or tubes in general B08B9/02; devices or arrangements for removing water, minerals, or sludge from boilers while the boiler is in operation, or which remain in position while the boiler is in operation, or are specifically adapted to boilers without any other utility F22B37/48; removal or treatment of combustion products or combustion residues F23J; removing ice from heat-exchange apparatus F28F17/00In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme. F28G1/00 F28G1/00Non-rotary, e.g. reciprocated, appliances F28G3/00 takes precedence F28G1/02having brushes F28G1/12 takes precedence; brushes A46B F28G1/04having articulated tools, e.g. assembled in chain manner F28G1/06having coiled wire tools, i.e. basket type F28G1/08having scrapers, hammers, or cutters, e.g. rigidly mounted F28G1/10resiliently mounted F28G1/12Fluid-propelled scrapers, bullets, or like solid bodies F28G1/125forced back and forth by means of flow reversal F28G1/14Pull-through rods F28G1/16using jets of fluid for removing debris F28G1/12 takes precedence F28G1/163from internal surfaces of heat exchange conduits F28G1/166from external surfaces of heat exchange conduits F28G3/00Rotary appliances F28G3/02having abrasive tools F28G3/04having brushes brushes A46B F28G3/06having articulated tools, e.g. assembled in chain manner F28G3/08having coiled wire tools, i.e. basket type F28G3/10having scrapers, hammers, or cutters, e.g. rigidly mounted F28G3/12resiliently mounted F28G3/14thrown into working position by centrifugal force F28G3/16using jets of fluid for removing debris F28G3/163from internal surfaces of heat exchange conduits F28G3/166from external surfaces of heat exchange conduits F28G5/00Cleaning by distortion by vibration F28G7/00 F28G7/00Cleaning by vibration or pressure waves F28G7/005by explosions or detonations; by pressure waves generated by combustion processes F28G9/00Cleaning by flushing or washing, e.g. with chemical solvents appliances using jets of fluid for removing debris F28G1/16, F28G3/16 F28G9/005of regenerative heat exchanger F28G11/00Cleaning by combustion, e.g. using squibs, using travelling burners F28G7/005 takes precedence F28G13/00Appliances or processes not covered by groups F28G1/00 - F28G11/00Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00 F28G13/005cleaning by increasing the temperature of heat exchange surfaces F28G7/005, F28G11/00 take precedence F28G15/00Details measuring thickness of deposit G01B F28G15/003Control arrangements F28G2015/006Arrangements for processing a cleaning fluid after use, e.g. filtering and recycling F28G15/02Supports for cleaning appliances, e.g. frames F28G15/04Feeding and driving arrangements, e.g. power operation F28G15/06Automatic reversing devices F28G15/08Locating position of cleaning appliances within conduits F28G15/10Masks for delimiting area to be cleaned