F
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  
LIGHTING AND HEATING
 F22
STEAM GENERATION (chemical or physical apparatus for generating gases B01J; chemical generation of gas, e.g. under pressure, Section C; generating combustion products of high pressure or high velocity F23R)
 F22

Note(s)

In this class, the term "steam" also covers 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 sub-class includes only methods of, and apparatus for, the generation of steam under pressure for heating or power purposes.


 F22D
PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER; FEED-WATER SUPPLY; CONTROLLING WATER LEVEL; CIRCULATING WATER WITHIN BOILERS (chemical treatment of water, e.g. purification, C02B; enclosed heat-exchange apparatus in general F28D; controlling in general G05)

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