|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

|  | F01 - F04 |
Subsection index
MACHINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F04C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F04B
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
ENGINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F03C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F03C
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
PUMPS |
positive displacement |
rotary or oscillating piston | F04C
reciprocating piston or other | F04B
non-positive displacement | F04D

LIGHTING; HEATING

|  | F28 |
HEAT EXCHANGE IN GENERAL (heat-transfer, heat-exchange or heat-storage materials Fulltext... Hierarchy... Expanded...C09K 5/00; arrangement or mounting of heat-exchangers in air-conditioning, air-humidification or ventilation Fulltext... Hierarchy... Expanded...F24F 13/00)

|  | F28 |
Note(s) In this class, the following expressions are used with the meanings indicated: "heat exchange" means the heating or cooling of a fluid or fluent solid by direct or indirect contact with a heated or cooled fluid or fluent solid; "heat transfer" means the heating or cooling of a fluid or fluent solid by direct contact with a heated or cooled surface or body. Apparatus using heat exchange or heat transfer (as defined in Note (1) above) for specific purposes is classified either in subclass Fulltext... Hierarchy... Expanded...F28B or in the appropriate subclasses of, for example, classes Fulltext... Hierarchy... Expanded...F22, Fulltext... Hierarchy... Expanded...F24, Fulltext... Hierarchy... Expanded...F25, Fulltext... Hierarchy... Expanded...F26, or Fulltext... Hierarchy... Expanded...F27; if no such other subclass is appropriate, such apparatus is classified in subclass Fulltext... Hierarchy... Expanded...F28C or Fulltext... Hierarchy... Expanded...F28D.

|  | F28G |
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 Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...F22B 37/00; removal or treatment of combustion products or combustion residues Fulltext... Hierarchy... Expanded...F23J; removing ice from heat-exchange apparatus Fulltext... Hierarchy... Expanded...F28F 17/00)

|  | F28G |
Subclass index
APPLIANCES FOR CLEANING: NON-ROTARY; ROTARY; OTHERS; DETAILS | 1/00; 3/00; 13/00; 15/00
CLEANING PROCESSES BY: DISTORTION; VIBRATION; FLUSHING OR WASHING; COMBUSTION; OTHERS | 5/00; 7/00; 9/00; 11/00; 13/00
COMBINATION OF PROCESSES | 13/00

P:60 |  | F28G 1/00 |
Non-rotary, e.g. reciprocated, appliances (Fulltext... Hierarchy... Expanded...F28G 3/00 takes precedence)

P:50 |  | F28G 3/00 |
Rotary appliances

P:40 |  | F28G 5/00 |
Cleaning by distortion (by vibration Fulltext... Hierarchy... Expanded...F28G 7/00)

P:30 |  | F28G 7/00 |
Cleaning by vibration

P:20 |  | F28G 9/00 |
Cleaning by flushing or washing, e.g. with chemical solvents (appliances using jets of fluid for removing debris Fulltext... Hierarchy... Expanded...F28G 1/00, Fulltext... Hierarchy... Expanded...F28G 3/00)

P:10 |  | F28G 11/00 |
Cleaning by combustion processes, e.g. using squibs, using travelling burners

P:0 |  | F28G 13/00 |
Appliances or processes not covered by groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F28G 1/00-F28G 11/00; Combinations of appliances or processes covered by groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F28G 1/00-F28G 11/00

P:70 |  | F28G 15/00 |
Details (measuring thickness of deposit Fulltext... Hierarchy... Expanded...G01B)