| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F28 | KL | HEAT EXCHANGE IN GENERAL (heat-transfer, heat-exchange or heat-storage materials C09K 5/00; arrangement or mounting of heat-exchangers in air-conditioning, air-humidification or ventilation F24F 13/30) |
| F28G | UKL | CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OF BOILERS (cleaning pipes or tubes in general B08B 9/02; 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 F22B 37/48; removal or treatment of combustion products or combustion residues F23J; removing ice from heat-exchange apparatus F28F 17/00) |
| F28G 1/00 | HGR | Non-rotary, e.g. reciprocated, appliances (F28G 3/00 takes precedence) |
| F28G 1/02 | UGR1 | | . | having brushes (brushes A46B) |
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| F28G 1/04 | UGR1 | | . | having articulated tools, e.g. assembled in chain manner |
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| F28G 1/06 | UGR1 | | . | having coiled wire tools, i.e. basket type |
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| F28G 1/08 | UGR1 | | . | having scrapers, hammers, or cutters, e.g. rigidly mounted |
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| F28G 1/10 | UGR2 | |
| F28G 1/12 | UGR1 | | . | Fluid-propelled scrapers, bullets, or like solid bodies |
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| F28G 1/14 | UGR1 | |
| F28G 1/16 | UGR1 | | . | using jets of fluid for removing debris (F28G 1/12 takes precedence) |
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| F28G 3/00 | HGR | Rotary appliances |
| F28G 3/02 | UGR1 | |
| F28G 3/04 | UGR1 | | . | having brushes (brushes A46B) |
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| F28G 3/06 | UGR1 | | . | having articulated tools, e.g. assembled in chain manner |
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| F28G 3/08 | UGR1 | | . | having coiled wire tools, i.e. basket type |
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| F28G 3/10 | UGR1 | | . | having scrapers, hammers, or cutters, e.g. rigidly mounted |
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| F28G 3/12 | UGR2 | |
| F28G 3/14 | UGR2 | | . . | thrown into working position by centrifugal force |
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| F28G 3/16 | UGR1 | | . | using jets of fluid for removing debris |
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| F28G 5/00 | HGR | Cleaning by distortion (by vibration F28G 7/00) |
| F28G 7/00 | HGR | Cleaning by vibration |
| F28G 9/00 | HGR | Cleaning by flushing or washing, e.g. with chemical solvents (appliances using jets of fluid for removing debris F28G 1/16 , F28G 3/16) |
| F28G 11/00 | HGR | Cleaning by combustion processes, e.g. using squibs, using travelling burners |
| F28G 13/00 | HGR | Appliances or processes not covered by groups F28G 1/00 to F28G 11/00; Combinations of appliances or processes covered by groups F28G 1/00 to F28G 11/00 |
| F28G 15/00 | HGR | Details (measuring thickness of deposit G01B) |
| F28G 15/02 | UGR1 | | . | Supports for cleaning appliances, e.g. frames |
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| F28G 15/04 | UGR1 | | . | Feeding or driving arrangements, e.g. power operation |
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| F28G 15/06 | UGR2 | | . . | Automatic reversing devices |
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| F28G 15/08 | UGR1 | | . | Locating position of cleaning appliances within conduits |
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| F28G 15/10 | UGR1 | | . | Masks for delimiting area to be cleaned |
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