F
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  
LIGHTING; HEATING
 F22
STEAM GENERATION (chemical or physical apparatus for generating gases B01J; chemical generation of gas, e.g. under pressure, Section C; removal of combustion products or residues, e.g. cleaning of the combustion contaminated surfaces of tubes of boilers, F23J; generating combustion products of high pressure or high velocity F23R; water heaters not for steam generation F24H, F28; cleaning of internal or external surfaces of heat-transfer conduits, e.g. water tubes of boilers, F28G)
 F22

Note(s)

In this class, the following term is used with the meaning indicated:

  • "steam" covers also other condensable vapours, e.g. mercury, diphenyl, diphenyl oxide.

 F22B
METHODS OF STEAM GENERATION; STEAM BOILERS (steam engine plants where engine aspects predominate F01K; domestic central-heating systems using steam F24D; heat exchange or heat transfer in general F28; generation of vapour in the cores of nuclear reactors G21)
 F22B

Note(s)

This subclass covers only methods of, or apparatus for, the generation of steam under pressure for heating or power purposes.

 F22B
Subclass index
METHODS FOR STEAM GENERATION 1/00, 3/00
STEAM BOILERS
General characteristics
having drum; having furnace tube; having fire tube; having combined fire tube and water tube; having fire-box 5/00; 7/00; 9/00; 11/00; 13/00
having water tubes
auxiliary tubes 11/00
horizontal; horizontally-inclined; combined horizontally-inclined and vertical; vertical or steeply-inclined 15/00; 17/00; 19/00; 21/00
formed of sets of spaced double-walled water tubes or of return tubes; water tubes with internally-arranged flue tubes 23/00; 25/00
Special characteristics 27/00, 29/00
Modifications or arrangements; details of general application 31/00; 37/00
PLANTS; CONTROL SYSTEMS 33/00; 35/00

 F22D
PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER; FEED-WATER SUPPLY; CONTROLLING WATER LEVEL; CIRCULATING WATER WITHIN BOILERS (chemical treatment of water, e.g. purification, C02F; enclosed heat-exchange apparatus in general F28D; controlling in general G05)

 F22G
SUPERHEATING OF STEAM (steam-separating arrangements in boilers F22B 37/26)