IPC 7 English version F22B 23/00-F22B 37/78

F22B02300-F22B03778

SECTION F – MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

F 22

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)

F 22 B

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)

23/

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

23/

the water-tube, i.e. Field-tube, sets being horizontal or substantially horizontal

23/

the water-tube, i.e. Field-tube, sets being vertical or substantially vertical

23/

Component parts thereof, e.g. Field water tubes (heat-exchange tubes in general F28F)

25/

Water-tube boilers built-up from sets of water tubes with internally-arranged flue tubes, or fire tubes, extending through the water tubes

27/

Instantaneous or flash steam boilers

27/

built-up from fire tubes

27/

built-up from water tubes (F22B 27/12 to F22B 27/16 take precedence)

27/

bent in serpentine or sinuous form

27/

bent helically, i.e. coiled

27/

bent spirally

27/

built-up from rotary heat-exchange elements, e.g. from tube assemblies

27/

built-up from heat-exchange elements arranged within a confined chamber having heat-retaining walls

27/

involving spray nozzles for sprinkling or injecting water particles on to or into hot heat-exchange elements, e.g. into tubes

29/

Steam boilers of forced-flow type

29/

of forced-circulation type

29/

of combined-circulation type, i.e. in which convection circulation due to the difference in specific gravity between cold and hot water is promoted by additional measures, e.g. by injecting pressure-water temporarily

29/

of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes (F22B 33/00 takes precedence)

29/

operating with fixed point of final state of complete evaporation

29/

operating with sliding point of final state of complete evaporation

29/

operating with superimposed recirculation during starting and low-load periods, e.g. composite boilers

31/

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 F22B 1/00; combustion apparatus per se F23)

31/

Installation of water-tube boilers in chimneys, e.g. in converter chimneys

31/

Heat supply by installation of two or more combustion apparatus, e.g. of separate combustion apparatus for the boiler and the superheater respectively

31/

Installation of emergency heat supply

31/

Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion

Steam-generation plants; Control systems

33/

Steam-generation plants, e.g. comprising steam boilers of different types in mutual association (arrangements or dispositions of steam-generation plants in marine vessels B63H 21/00)

33/

Combinations of boilers having a single combustion apparatus in common

33/

of boilers of furnace-tube type with boilers of water-tube type

33/

of boilers of furnace-tube type with boilers of fire-tube type

33/

of boilers of water-tube type with boilers of fire-tube type

33/

of two or more superposed boilers with separate water volumes and operating with two or more separate water levels

33/

Self-contained steam boilers, i.e. comprising as a unit the steam boiler, the combustion apparatus, the fuel storage, accessory machines, and equipment

33/

Combinations of low- and high-pressure boilers

33/

of forced-flow type

33/

Combinations of steam boilers with other apparatus

35/

Control systems for steam boilers (regulation or control of steam power plants F01K 7/00; for regulating feed-water supply F22D; for controlling superheat temperature F22G 5/00; control of combustion F23N)

35/

for steam boilers with natural convection circulation

35/

during starting-up periods, i.e. during the periods between the lighting of the furnaces and the attainment of the normal operating temperature of the steam boilers

35/

for steam boilers of forced-flow type

35/

of forced-circulation type

35/

of once-through type

35/

operating at critical or supercritical pressure

35/

during the starting-up periods, i.e. during the periods between the lighting of the furnaces and the attainment of the normal operating temperature of the steam boilers

35/

responsive to the percentage of steam in the mixture of steam and water

35/

Applications of computers to steam-boiler control

37/

Component parts or details of steam boilers (venting devices F16K 24/00; steam traps or like apparatus F16T)

37/

applicable to more than one kind or type of steam boiler

37/

and characterised by material, e.g. use of special steel alloy

37/

Flue or fire tubes; Accessories therefor, e.g. fire-tube inserts

37/

Fittings preventing burning-off of the tube edges

37/

Water tubes; Accessories therefor (working of metal tubes B21D; pipes in general F16L; repairing leaks in water tubes F16L 55/16, F28F 11/00; cleaning water tubes of boilers F23J, F28G; baffles, screens, or deflectors formed of water tubes F23M 9/10)

37/

Forms of water tubes, e.g. of varying cross-section

37/

Supply mains, e.g. rising mains, down-comers, in connection with water tubes

37/

Return bends

37/

Inserts, e.g. for receiving deposits from water

37/

Supporting arrangements, e.g. for securing water-tube sets (construction of tube walls of furnaces including boiler furnaces F23M 5/08)

37/

Drums; Headers; Accessories therefor (making boilers from sheet metal B21D 51/24; pressure vessels in general F16J 12/00; covers or similar closure members for pressure vessels in general F16J 13/00)

37/

Supporting, suspending, or setting arrangements, e.g. heat shielding (frames, engine beds F16M)

37/

Steam-separating arrangements (vapour-liquid separators, e.g. for drying steam, B01D, B04)

37/

involving reversal of direction of flow

37/

using impingement against baffle separators

37/

using centrifugal force

37/

Adaptations of boilers for promoting water circulation (auxiliary apparatus F22D 7/00)

37/

Arrangements for sheathing or casing boilers

37/

Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes (measuring or indicating instruments in general G01)

37/

Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles (in flues or chimneys F23J 13/00)

37/

Applications, arrangements, or dispositions of alarm or automatic safety devices (for feed-water heaters F22D 1/14; alarms responsive to undesired or abnormal conditions G08B)

37/

of safety valves (safety valves per se F16K)

37/

responsive to low or high water level, e.g. for checking, suppressing, extinguishing combustion in boilers (fire-fighting, fire extinction in general A62)

37/

responsive to abnormal temperature, e.g. actuated by fusible plugs (such alarms or devices per se G08B)

37/

Devices or arrangements for removing water, minerals, or sludge from boilers (cleaning water tubes, furnace tubes, or the like of boilers F23J, F28G)

Note

Group F22B 37/48 covers only systems used 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. [4]

37/

for draining or expelling water

37/

Washing-out devices

37/

De-sludging or blow-down devices

37/

Boiler-cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down

37/

Removing tubes from headers or drums; Extracting tools

37/

specially adapted for steam boilers of instantaneous or flash type

37/

specially adapted for steam boilers of forced-flow type

37/

Mounting of, or supporting arrangements for, tube units (construction of tube walls of furnaces, e.g. boiler furnaces F23M 5/08)

37/

involving vertically-disposed water tubes

37/

involving horizontally-disposed water tubes

37/

Arrangements for distributing water into water tubes

37/

involving injection devices

37/

Throttling arrangements for tubes or sets of tubes

37/

Adaptations or mounting of devices for observing existence or direction of fluid flow (devices per se G01P)

37/

Adaptations or mounting of level indicators (level indicators per se G01F)

F22 - F22B 21/40