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

LIGHTING AND HEATING

|  | F22 |
STEAM GENERATION (chemical or physical apparatus for generating gases Fulltext... Hierarchy... Expanded...B01J; chemical generation of gas, e.g. under pressure, Section C; generating combustion products of high pressure or high velocity Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...F01K; domestic central-heating systems using steam Fulltext... Hierarchy... Expanded...F24D; heat exchange or heat transfer in general Fulltext... Hierarchy... Expanded...F28; generation of vapour in the cores of nuclear reactors Fulltext... Hierarchy... Expanded...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, Fulltext... Hierarchy... Expanded...C02B; enclosed heat-exchange apparatus in general Fulltext... Hierarchy... Expanded...F28D; controlling in general Fulltext... Hierarchy... Expanded...G05)

|  | F22G |
SUPERHEATING OF STEAM (steam-separating arrangements in boilers Fulltext... Hierarchy... Expanded...F22B 37/26)