|  | 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

|  | F22 |
STEAM GENERATION (chemical or physical apparatus for generating gases Fulltext... Hierarchy... Expanded...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, Fulltext... Hierarchy... Expanded...F23J; generating combustion products of high pressure or high velocity Fulltext... Hierarchy... Expanded...F23R; water heaters not for steam generation Fulltext... Hierarchy... Expanded...F24H, Fulltext... Hierarchy... Expanded...F28; cleaning of internal or external surfaces of heat-transfer conduits, e.g. water tubes of boilers, Fulltext... Hierarchy... Expanded...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 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 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

P:0 |  | F22B 1/00 |
Methods of steam generation characterised by form of heating method (use of solar heat Fulltext... Hierarchy... Expanded...F24J 2/00; jackets or other cooling means in which steam is generated and which serve for cooling other apparatus, see the subclasses for such apparatus)

P:10 |  | F22B 3/00 |
Other methods of steam generation; Steam boilers not provided for in other groups of this subclass

P:170 |  | F22B 5/00 |
Steam boilers of drum type, i.e. without internal furnace or fire tubes, the boiler body being contacted externally by flue gas

P:160 |  | F22B 7/00 |
Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed inside one or more furnace tubes built-in in the boiler body

P:150 |  | F22B 9/00 |
Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body

P:80 |  | F22B 11/00 |
Steam boilers of combined fire-tube type and water-tube type, i.e. steam boilers of fire-tube type having auxiliary water tubes

P:140 |  | F22B 13/00 |
Steam boilers of fire-box type, i.e. the combustion of fuel being performed in a chamber or fire-box with subsequent flue(s) or fire tube(s), both chamber or fire-box and flues or fire tubes being built-in in the boiler body

P:110 |  | F22B 15/00 |
Water-tube boilers of horizontal type, i.e. the water-tube sets being arranged horizontally

P:120 |  | F22B 17/00 |
Water-tube boilers of horizontally-inclined type, i.e. the water-tube sets being inclined slightly with respect to the horizontal plane

P:100 |  | F22B 19/00 |
Water-tube boilers of combined horizontally-inclined type and vertical type, i.e. water-tube boilers of horizontally-inclined type having auxiliary water-tube sets in vertical or substantially-vertical arrangement

P:130 |  | F22B 21/00 |
Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically

P:90 |  | F22B 23/00 |
Water-tube boilers built-up from sets of spaced double-walled water tubes of return type in unilaterial abutting connection with a boiler drum or with a header box, i.e. built-up from Field water tubes comprising an inner tube arranged within an outer unilaterally-closed tube

P:70 |  | F22B 25/00 |
Water-tube boilers built-up from sets of water tubes with internally-arranged flue tubes, or fire tubes, extending through the water tubes

P:50 |  | F22B 27/00 |
Instantaneous or flash steam boilers

P:60 |  | F22B 29/00 |
Steam boilers of forced-flow type

P:40 |  | F22B 31/00 |
Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus (steam generation characterised by heating method Fulltext... Hierarchy... Expanded...F22B 1/00; combustion apparatus per se Fulltext... Hierarchy... Expanded...F23)

|  | F22B 33/00 - F22B 35/00 |
Steam-generation plants; Control systems

P:30 |  | F22B 33/00 |
Steam-generation plants, e.g. comprising steam boilers of different types in mutual association (arrangements or dispositions of steam-generation plants in marine vessels Fulltext... Hierarchy... Expanded...B63H 21/00)

P:20 |  | F22B 35/00 |
Control systems for steam boilers (regulation or control of steam power plants Fulltext... Hierarchy... Expanded...F01K 7/00; for regulating feed-water supply Fulltext... Hierarchy... Expanded...F22D; for controlling superheat temperature Fulltext... Hierarchy... Expanded...F22G 5/00; control of combustion Fulltext... Hierarchy... Expanded...F23N)

P:180 |  | F22B 37/00 |
Component parts or details of steam boilers (venting devices Fulltext... Hierarchy... Expanded...F16K 24/00; steam traps or like apparatus Fulltext... Hierarchy... Expanded...F16T; construction of tube walls of boiler furnaces Fulltext... Hierarchy... Expanded...F23M 5/00)