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Indent Level
Color Curly Brackets (indicating CPC extensions to IPC)

CPC
COOPERATIVE PATENT CLASSIFICATION
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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)
NOTE
-
This subclass covers only methods of, or apparatus for, the generation of steam under pressure for heating or power purposes

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Guide Heading:
General aspects of, or methods for, steam generation
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Methods of steam generation characterised by form of heating method (solar heating F24J; jackets or other cooling means in which steam is generated and which serve for cooling other apparatus, see the subclasses for such apparatus)
F22B 1/003
.
{
using combustion of hydrogen with oxygen (power plants using steam created by combustion of hydrogen with oxygen F01K 25/005)
}
F22B 1/006
.
{
using solar heat (solar heat collectors per se F24J 2/00; devices for producing mechanical power from solar energy F03G 6/00)
}
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F22B 1/02
.
by exploitation of the heat content of hot heat carriers
F22B 1/021
. .
{
with heating tubes in which flows a non-specified heating fluid (for nuclear reactors F22B 1/023, for hot gas F22B 1/1884)
}
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F22B 1/023
. .
{
with heating tubes, for nuclear reactors as far as they are not classified, according to a specified heating fluid, in another group
}
F22B 1/025
. . .
{
with vertical U shaped tubes carried on a horizontal tube sheet
}
F22B 1/026
. . .
{
with vertical tubes between to horizontal tube sheets
}
F22B 1/028
. .
{
Steam generation using heat accumulators (F22B 27/14 takes precedence)
}
F22B 1/04
. .
the heat carrier being hot slag, hot residues, or heated blocks, e.g. iron blocks
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F22B 1/06
. .
the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium
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F22B 1/063
. . .
{
for metal cooled nuclear reactors (heat-exchangers having a liquid metal as heat exchange medium F28D7/00C)
}
F22B 1/066
. . . .
{
with double-wall tubes having a third fluid between these walls, e.g. helium for leak detection (heat-exchangers with double-wall tubes F28D 7/10; double-wall pipes per se F16L 9/18)
}
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F22B 1/08
. .
the heat carrier being steam
F22B 1/10
. . .
released from heat accumulators
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F22B 1/12
. . .
produced by an indirect cyclic process
F22B 1/123
. . . .
{
Steam generators downstream of a nuclear boiling water reactor
}
F22B 1/126
. . . .
{
Steam generators of the Schmidt-Hartmann type
}
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F22B 1/14
. . .
coming in direct contact with water in bulk or in sprays
F22B 1/143
. . . .
{
in combination with a nuclear installation
}
F22B 1/146
. . . .
{
Loffler boilers
}
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F22B 1/16
. .
the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour
F22B 1/162
. . .
{
in combination with a nuclear installation
}
F22B 1/165
. . .
{
using heat pipes (heat pipes per se F28D 15/02)
}
F22B 1/167
. . .
{
using an organic fluid
}
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F22B 1/18
. .
the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines (use of waste heat of combustion engines, in general, F02G)
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F22B 1/1807
. . .
{
using the exhaust gases of combustion engines
}
F22B 1/1815
. . . .
{
using the exhaust gases of gas-turbines
}
F22B 1/1823
. . .
{
for gas-cooled nuclear reactors
}
F22B 1/183
. . .
{
in combination with metallurgical converter installations
}
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F22B 1/1838
. . .
{
the hot gas being under a high pressure, e.g. in chemical installations
}
F22B 1/1846
. . . .
{
the hot gas being loaded with particles, e.g. waste heat boilers after a coal gasification plant
}
F22B 1/1853
. . .
{
coming in direct contact with water in bulk or in sprays
}
F22B 1/1861
. . .
{
Waste heat boilers with supplementary firing
}
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F22B 1/1869
. . .
{
Hot gas water tube boilers not provided for in F22B 1/1807 - F22B 1/1861
}
F22B 1/1876
. . . .
{
the hot gas being loaded with particles, e.g. dust (with the hot gas being under high pressure F22B 1/1846)
}
F22B 1/1884
. . .
{
Hot gas heating tube boilers with one or more heating tubes
}
F22B 1/1892
. . .
{
Systems therefor not provided for in F22B 1/1807 to F22B 1/1861
}
F22B 1/20
.
using heat evolved in a solution absorbing steam; Soda steam boilers
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F22B 1/22
.
using combustion under pressure substantially exceeding atmospheric pressure
F22B 1/24
. .
Pressure-fired steam boilers, e.g. using turbo-air compressors actuated by hot gases from boiler furnace
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F22B 1/26
. .
Steam boilers of submerged-flame type, i.e. the flame being surrounded by, or impinging on, the water to be vaporised
{
e.g. water in sprays
}
F22B 1/265
. . .
{
the water being in bulk
}
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F22B 1/28
.
in boilers heated electrically
{
(superheating using an electrical heat source independent from heat supply of the steam boiler F22G 1/165)
}
F22B 1/281
. .
{
other than by electrical resistances or electrodes
}
F22B 1/282
. .
{
with water or steam circulating in tubes or ducts
}
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F22B 1/284
. .
{
with water in reservoirs
}
F22B 1/285
. . .
{
the water being fed by a pump to the reservoirs
}
F22B 1/287
. .
{
with water in sprays or in films
}
F22B 1/288
. .
{
Instantaneous electrical steam generators built-up from heat-exchange elements arranged within a confined chamber having heat-retaining walls
}
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F22B 1/30
. .
Electrode boilers
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F22B 1/303
. . .
{
with means for injecting or spraying water against electrodes or with means for water circulation
}
F22B 1/306
. . . .
{
with at least one electrode permanently above the water surface
}
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Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
F22B 3/02
.
involving the use of working media other than water
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F22B 3/04
.
by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators (steam accumulators per se F01K 1/00)
F22B 3/045
. .
{
the drop in pressure being achieved by compressors, e.g. with steam jet pumps
}
F22B 3/06
.
by transformation of mechanical, e.g. kinetic, energy into heat energy
F22B 3/08
.
at critical or supercritical pressure values
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Guide Heading:
Kinds of steam boilers
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Steam boilers of drum type, i.e. without internal furnace or fire tubes, the boiler body being contacted externally by flue gas
F22B 5/005
.
{
with rotating drums
}
F22B 5/02
.
with auxiliary water tubes outside the boiler body
F22B 5/04
.
Component parts thereof; Accessories therefor (covers or similar closure members F16J 13/00)
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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
F22B 7/02
.
without auxiliary water tubes
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F22B 7/04
.
with auxiliary water tubes
F22B 7/06
. .
inside the furnace tube in transverse arrangements
F22B 7/08
. .
inside the furnace tube in longitudinal arrangement
F22B 7/10
. .
outside the boiler body
F22B 7/12
.
with auxiliary fire tubes; Arrangement of header boxes providing for return diversion of flue gas flow
F22B 7/14
.
with both auxiliary water tubes and auxiliary fire tubes
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F22B 7/16
.
Component parts thereof; Accessories therefor, e.g. stay-bolt connections
F22B 7/18
. .
Walling of flues; Flue gas header boxes
F22B 7/20
. .
Furnace tubes
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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
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F22B 9/02
.
the boiler body being disposed upright, e.g. above the combustion chamber
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F22B 9/04
. .
the fire tubes being in upright arrangement
F22B 9/06
. . .
Arrangement of header boxes providing for return diversion of flue gas flow
F22B 9/08
. .
the fire tubes being in horizontal arrangement
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F22B 9/10
.
the boiler body being disposed substantially horizontally, e.g. at the side of the combustion chamber
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F22B 9/12
. .
the fire tubes being in substantially horizontal arrangement
F22B 9/14
. . .
Arrangement of header boxes providing for return diversion of flue gas flow
F22B 9/16
.
the boiler body containing fire tubes disposed crosswise in inclined upward arrangement
F22B 9/18
.
Component parts thereof; Accessories therefor, e.g. stay-bolt connections
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Steam boilers of combined fire-tube type and water-tube type, i.e. steam boilers of fire-tube type having auxiliary water tubes
F22B 11/02
.
the fire tubes being in upright arrangement
F22B 11/04
.
the fire tubes being in horizontal arrangement
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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
F22B 13/005
.
{
with flues, other than fire tubes
}
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F22B 13/02
.
mounted in fixed position with the boiler body disposed upright
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F22B 13/023
. .
{
with auxiliary water tubes inside the fire-box, e.g. vertical tubes (F22B 13/10 takes precedence)
}
F22B 13/026
. . .
{
the tubes being in substantially horizontal arrangement
}
F22B 13/04
.
mounted in fixed position with the boiler body disposed substantially horizontally
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F22B 13/06
.
Locomobile, traction-engine, steam-roller, or locomotive boilers
F22B 13/065
. .
{
Combination of low and high pressure locomotive boilers
}
F22B 13/08
. .
without auxiliary water tubes inside the fire-box
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F22B 13/10
. .
with auxiliary water tubes inside the fire-box
F22B 13/12
. . .
the auxiliary water tubes lining the fire-box
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F22B 13/14
.
Component parts thereof; Accessories therefor
F22B 13/145
. .
{
Firebox thermosiphons
}
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F22B 13/16
. .
Stay-bolt connections, e.g. rigid connections
F22B 13/18
. . .
Flexible connections, e.g. of ball-and-socket type
Water-tube boilers of horizontal type, i.e. the water-tube sets being arranged horizontally
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Water-tube boilers of horizontally-inclined type, e.g. the water-tube sets being inclined slightly with respect to the horizontal plane
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F22B 17/02
.
built-up from water-tube sets in abutting connection with two header boxes in common for all sets, e.g. with flat header boxes
F22B 17/025
. .
{
with combined inlet and outlet header boxes, e.g. connected by U-tubes or Field tubes
}
F22B 17/04
. .
the water-tube sets being inclined in opposite directions, e.g. crosswise
F22B 17/06
. .
the water-tube sets being bent angularly
F22B 17/08
. .
the water-tube sets being curved
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F22B 17/10
.
built-up from water-tube sets in abutting connection with two sectional headers each for every set, i.e. with headers in a number of sections across the width or height of the boiler
F22B 17/105
. .
{
with tubes in series flow arrangement
}
F22B 17/12
. .
the sectional headers being in vertical or substantially vertical arrangement
F22B 17/14
. .
the sectional headers being in horizontal or substantially horizontal arrangement
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F22B 17/16
.
Component parts thereof; Accessories therefor
F22B 17/18
. .
Header boxes; Sectional headers
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
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Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
F22B 21/002
.
{
involving a single upper drum (F22B 21/36 takes precedence)
}
F22B 21/005
.
{
involving a central vertical drum, header or downcomer
}
F22B 21/007
.
{
specially adapted for locomotives
}
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F22B 21/02
.
built-up from substantially straight water tubes
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F22B 21/04
. .
involving a single upper drum and a single lower drum, e.g. the drums being arranged transversely
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F22B 21/06
. . .
the water tubes being arranged annularly in sets, e.g. in abutting connection with drums of annular shape
F22B 21/065
. . . .
{
involving an upper and lower drum of annular shape
}
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F22B 21/08
. . .
the water tubes being arranged sectionally in groups or in banks, e.g. bent over at their ends
F22B 21/081
. . . .
{
involving a combustion chamber, placed at the side and built-up from water tubes
}
F22B 21/083
. . . .
{
involving an upper drum and a lower drum and a fire-place between the two drums
}
F22B 21/085
. . . .
{
the tubes being placed in layers
}
F22B 21/086
. . . .
{
Frames built-up from water tubes
}
F22B 21/088
. . . .
{
involving an upper drum and a lower drum and two lateral drums
}
F22B 21/10
. . .
the water tubes being arranged in staggered rows
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F22B 21/12
. .
involving two or more upper drums and two or more lower drums, e.g. with crosswise-arranged water-tube sets in abutting connections with drums
F22B 21/123
. . .
{
involving crossed water tubes
}
F22B 21/126
. . .
{
involving more than two lower or upper drums
}
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F22B 21/14
. .
involving a single upper drum and two or more lower drums
F22B 21/16
. . .
the lower drums being interconnected by further water tubes
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F22B 21/18
. .
involving two or more upper drums and a single lower drum
F22B 21/185
. . .
{
involving more than two upper drums and a single lower drum
}
F22B 21/20
. .
involving sectional or subdivided headers in separate arrangement for each water-tube set
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F22B 21/22
.
built-up from water tubes of form other than straight or substantially straight
F22B 21/24
. .
bent in serpentine or sinuous form
F22B 21/26
. .
bent helically, i.e. coiled
F22B 21/28
. .
bent spirally
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F22B 21/30
. .
bent in U-loop form
F22B 21/32
. . .
disposed horizontally in abutting connection with upright headers or rising water mains
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F22B 21/34
.
built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
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F22B 21/341
. .
{
Vertical radiation boilers with combustion in the lower part
}
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F22B 21/343
. . .
{
the vertical radiation combustion chamber being connected at its upper part to a sidewards convection chamber
}
F22B 21/345
. . . .
{
with a tube bundle between an upper and a lower drum in the convection pass
}
F22B 21/346
. .
{
Horizontal radiation boilers
}
F22B 21/348
. .
{
Radiation boilers with a burner at the top
}
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F22B 21/36
. .
involving an upper drum or headers mounted at the top of the combustion chamber
F22B 21/363
. . .
{
involving a horizontal drum mounted in an upper corner of the boiler
}
F22B 21/366
. . .
{
involving a horizontal drum mounted in the middle of the boiler
}
F22B 21/38
. .
Component parts thereof, e.g. prefabricated panels
F22B 21/40
.
built-up from water tubes arranged in a comparatively long vertical shaft, i.e. tower boilers
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Water-tube boilers built-up from sets of spaced double-walled water tubes of return type in unilateral 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
F22B 23/02
.
the water-tube, i.e. Field-tube, sets being horizontal or substantially horizontal
F22B 23/04
.
the water-tube, i.e. Field-tube, sets being vertical or substantially vertical
F22B 23/06
.
Component parts thereof, e.g. Field water tubes (heat-exchange tubes in general F28F)
Water-tube boilers built-up from sets of water tubes with internally-arranged flue tubes, or fire tubes, extending through the water tubes
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Instantaneous or flash steam boilers
F22B 27/02
.
built-up from fire tubes
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F22B 27/04
.
built-up from water tubes (F22B 27/12 to F22B 27/16 take precedence)
F22B 27/06
. .
bent in serpentine or sinuous form
F22B 27/08
. .
bent helically, i.e. coiled
F22B 27/10
. .
bent spirally
F22B 27/12
.
built-up from rotary heat-exchange elements, e.g. from tube assemblies
F22B 27/14
.
built-up from heat-exchange elements arranged within a confined chamber having heat-retaining walls
{
(F22B 1/288 takes precedence)
}
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F22B 27/16
.
involving spray nozzles for sprinkling or injecting water particles on to or into hot heat-exchange elements, e.g. into tubes
{
(F22B 1/287 takes precedence)
}
F22B 27/165
. .
{
with film flow of water on heated surfaces
}
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Steam boilers of forced-flow type
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F22B 29/02
.
of forced-circulation type
{
(F22B 29/06 takes precedence)
}
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F22B 29/023
. .
{
without drums, i.e. without hot water storage in the boiler
}
F22B 29/026
. . .
{
operating at critical or supercritical pressure
}
F22B 29/04
.
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
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F22B 29/06
.
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)
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F22B 29/061
. .
{
Construction of tube walls
}
F22B 29/062
. . .
{
involving vertically-disposed water tubes
}
F22B 29/064
. . .
{
involving horizontally- or helically-disposed water tubes
}
F22B 29/065
. . .
{
involving upper vertically disposed water tubes and lower horizontally- or helically disposed water tubes
}
F22B 29/067
. .
{
operating at critical or supercritical pressure (with recirculation during normal operation F22B 29/026)
}
F22B 29/068
. .
{
operating with superimposed recirculation during normal operation (F22B 29/12 takes precedence)
}
F22B 29/08
. .
operating with fixed point of final state of complete evaporation (
{
evaporation or evaporation apparatus for physical or chemical purposes, e.g. evaporation of liquids for gas phase reactions B01B 1/005
}
)
F22B 29/10
. .
operating with sliding point of final state of complete evaporation (
{
evaporation or evaporation apparatus for physical or chemical purposes, e.g. evaporation of liquids for gas phase reactions B01B 1/005
}
)
F22B 29/12
. .
operating with superimposed recirculation during starting and low-load periods, e.g. composite boilers
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Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus (steam generation characterised by heating method F22B 1/00; combustion apparatus per se F23)
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F22B 31/0007
.
{
with combustion in a fluidized bed (fluidized bed apparatus per se B01J 8/00; fluidized bed combustors F23C 10/00)
}
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F22B 31/0015
. .
{
for boilers of the water tube type
}
F22B 31/0023
. . .
{
with tubes in the bed (F22B 31/003 takes precedence)
}
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F22B 31/003
. . .
{
with tubes surrounding the bed or with water tube wall partitions
}
F22B 31/0038
. . . .
{
with tubes in the bed
}
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F22B 31/0046
. .
{
for boilers of the shell type, e.g. with furnace box
}
F22B 31/0053
. . .
{
with auxiliary water tubes
}
F22B 31/0061
. .
{
Constructional features of bed cooling
}
F22B 31/0069
. .
{
Systems therefor
}
F22B 31/0076
. .
{
Controlling processes for fluidized bed boilers not related to a particular type
}
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F22B 31/0084
. .
{
with recirculation of separated solids or with cooling of the bed particles outside the combustion bed
}
F22B 31/0092
. . .
{
with a fluidized heat exchange bed and a fluidized combustion bed separated by a partition, the bed particles circulating around or through that partition
}
F22B 31/02
.
Installation of water-tube boilers in chimneys, e.g. in converter chimneys
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F22B 31/04
.
Heat supply by installation of two or more combustion apparatus, e.g. of separate combustion apparatus for the boiler and the superheater respectively
F22B 31/045
. .
{
Steam generators specially adapted for burning refuse
}
F22B 31/06
. .
Installation of emergency heat supply
F22B 31/08
.
Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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Guide Heading:
Steam-generation plants; Control systems
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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)
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F22B 33/02
.
Combinations of boilers having a single combustion apparatus in common
F22B 33/04
. .
of boilers of furnace-tube type with boilers of water-tube type
F22B 33/06
. .
of boilers of furnace-tube type with boilers of fire-tube type
F22B 33/08
. .
of boilers of water tube type with boilers of fire-tube type
F22B 33/10
. .
of two or more superposed boilers with separate water volumes and operating with two or more separate water levels
F22B 33/12
.
Self-contained steam boilers, i.e. comprising as a unit the steam boiler, the combustion apparatus, the fuel storage, accessory machines and equipment
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F22B 33/14
.
Combination of low and high pressure boilers (F22B 13/065 takes precedence)
F22B 33/16
. .
of forced-flow type
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F22B 33/18
.
Combinations of steam boilers with other apparatus
F22B 33/185
. .
{
in combination with a steam accumulator
}
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Control systems for steam boilers (
{
for fluidized bed boilers F22B 31/0076;
}
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; regulating or controlling in general G05)
F22B 35/001
.
{
Controlling by flue gas dampers (for superheaters F22G 5/04)
}
F22B 35/002
.
{
Control by recirculating flue gases (for superheaters F22G 5/06)
}
F22B 35/004
.
{
Control systems for steam generators of nuclear power plants
}
F22B 35/005
.
{
Control systems for instantaneous steam boilers
}
F22B 35/007
.
{
Control systems for waste heat boilers
}
F22B 35/008
.
{
Control systems for two or more steam generators (F22D 5/36 takes precedence)
}
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F22B 35/02
.
for steam boilers with natural convection circulation
F22B 35/04
. .
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
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F22B 35/06
.
for steam boilers of forced-flow type
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F22B 35/08
. .
of forced-circulation type
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F22B 35/083
. . .
{
without drum, i.e. without hot water storage in the boiler
}
F22B 35/086
. . . .
{
operating at critical or supercritical pressure
}
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F22B 35/10
. .
of once-through type
F22B 35/101
. . .
{
operating with superimposed recirculation during starting or low load periods, e.g. composite boilers (F22B 35/125 takes precedence)
}
F22B 35/102
. . .
{
operating with fixed point of final state of complete evaporation, e.g. in a steam-water separator
}
F22B 35/104
. . .
{
Control systems by injecting water (for superheaters F22G 5/12)
}
F22B 35/105
. . .
{
operating at sliding pressure
}
F22B 35/107
. . .
{
Control systems with auxiliary heating surfaces
}
F22B 35/108
. . .
{
Control systems for steam generators having multiple flow paths
}
Collapse
F22B 35/12
. . .
operating at critical or supercritical pressure
F22B 35/125
. . . .
{
operating with superimposed recirculation during starting or low load periods, e.g. composite boilers
}
F22B 35/14
. .
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
F22B 35/16
. .
responsive to the percentage of steam in the mixture of steam and water
F22B 35/18
.
Application of computers to steam boiler control
Collapse
Component parts or details of steam boilers (venting devices F16K 24/00; steam traps or like apparatus F16T)
F22B 37/001
.
{
Steam generators built-up from pre-fabricated elements
}
Collapse
F22B 37/002
.
{
specially adapted for nuclear steam generators, e.g. maintenance, repairing or inspecting equipment not otherwise provided for
}
Collapse
F22B 37/003
. .
{
Maintenance, repairing or inspecting equipment positioned in or via the headers
}
F22B 37/005
. . .
{
Positioning apparatus specially adapted therefor (F22B 37/64 takes precedence)
}
F22B 37/006
. .
{
Walking equipment, e.g. walking platforms suspended at the tube sheet (walking mechanism per se B62D 57/02)
}
F22B 37/007
. .
{
Installation or removal of nuclear steam generators
}
F22B 37/008
.
{
Adaptations for flue gas purification in steam generators, (flue gas purification in general F23J; gas purification in general B01D)
}
Collapse
F22B 37/02
.
applicable to more than one kind or type of steam boiler
F22B 37/025
. .
{
Devices and methods for diminishing corrosion, e.g. by preventing cooling beneath the dew point
}
F22B 37/04
. .
and characterised by material, e.g. use of special steel alloy
Collapse
F22B 37/06
. .
Flue or fire tubes; Accessories therefor, e.g. fire-tube inserts
F22B 37/08
. . .
Fittings preventing burning-off of the tube edges
Collapse
F22B 37/10
. .
Water tubes; Accessories therefor (working of metal tubes B21D; pipes in general F16L; repairing leaks in water tubes F16L 55/16; F28F 11/00; baffles, screens, or deflectors formed of water tubes F23M 9/10; cleaning internal or external surfaces of water tubes F28G)
Collapse
F22B 37/101
. . .
{
Tubes having fins or ribs
}
F22B 37/102
. . . .
{
Walls built-up from finned tubes
}
F22B 37/103
. . . .
{
Internally ribbed tubes
}
F22B 37/104
. . .
{
Connection of tubes one with the other or with collectors, drums or distributors (in general F16L)
}
F22B 37/105
. . .
{
Penetrations of tubes through a wall and their sealing (in general F16L 5/00)
}
F22B 37/106
. . .
{
Studding of tubes
}
Collapse
F22B 37/107
. . .
{
Protection of water tubes (in general F16L 57/00)
}
F22B 37/108
. . . .
{
Protection of water tube walls
}
Collapse
F22B 37/12
. . .
Forms of water tubes, e.g. of varying cross-section
F22B 37/125
. . . .
{
Bifurcates
}
Collapse
F22B 37/14
. . .
Supply mains, e.g. rising mains, down-comers, in connection with water tubes
F22B 37/141
. . . .
{
involving vertically-disposed water tubes, e.g. walls built-up from vertical tubes
}
F22B 37/142
. . . .
{
involving horizontally-or helically-disposed water tubes, e.g. walls built-up from horizontal or helical tubes
}
F22B 37/143
. . . .
{
Panel shaped heating surfaces built up from tubes (F22B 37/145 takes precedence)
}
F22B 37/145
. . . .
{
Flag-shaped panels built-up from tubes, e.g. from U-shaped tubes
}
F22B 37/146
. . . .
{
Tube arrangements for ash hoppers and grates and for combustion chambers of the cyclone or similar type out of the flues
}
F22B 37/147
. . . .
{
Tube arrangements for cooling orifices, doors and burners
}
F22B 37/148
. . . .
{
Tube arrangements for the roofs
}
Collapse
F22B 37/16
. . .
Return bends
F22B 37/165
. . . .
{
Closures for access openings in return bends (boiler plugs for drums or headers F22B 37/223)
}
F22B 37/18
. . .
Inserts, e.g. for receiving deposits from water
Collapse
F22B 37/20
. . .
Supporting arrangements, e.g. for securing water-tube sets (construction of tube walls of furnaces including boiler furnaces F23M 5/08)
F22B 37/201
. . . .
{
Suspension and securing arrangements for walls built-up from tubes
}
Collapse
F22B 37/202
. . . .
{
Suspension and securing arrangements for contact heating surfaces
}
F22B 37/203
. . . . .
{
Horizontal tubes supported only away from their ends on vertical support tubes
}
F22B 37/204
. . . .
{
Supporting arrangements for individual tubes, e.g. for securing tubes to a refractory wall
}
Collapse
F22B 37/205
. . . .
{
Supporting and spacing arrangements for tubes of a tube bundle
}
F22B 37/206
. . . . .
{
Anti-vibration supports for the bends of U-tube steam generators
}
F22B 37/207
. . . .
{
Supporting arrangements for drums and collectors
}
F22B 37/208
. . . .
{
Backstay arrangements
}
Collapse
F22B 37/22
. .
Drums; Headers; Accessories therefor (making boilers from sheet metal B21D 51/24; pressure vessels in general F16J 12/00; covers or similar closure members F16J 13/00)
Collapse
F22B 37/221
. . .
{
Covers for drums, collectors, manholes or the like (in general F16J 13/00)
}
F22B 37/222
. . . .
{
Nozzle dams introduced through a smaller manway, e.g. foldable
}
F22B 37/223
. . . .
{
Boiler plugs, e.g. for handholes (closures for access openings in return bends F22B 37/165)
}
F22B 37/225
. . .
{
Arrangements on drums or collectors for fixing tubes or for connecting collectors to each other
}
F22B 37/226
. . .
{
Protection of drums against combustion
}
F22B 37/227
. . .
{
Drums and collectors for mixing
}
F22B 37/228
. . .
{
Headers for distributing feedwater into steam generator vessels; Accessories therefor
}
Collapse
F22B 37/24
. .
Supporting, suspending, or setting arrangements, e.g. heat shielding (frames, engine beds F16M)
F22B 37/242
. . .
{
for bottom supported water-tube steam generators
}
F22B 37/244
. . .
{
for water-tube steam generators suspended from the top
}
Collapse
F22B 37/246
. . .
{
for steam generators of the reservoir type, e.g. nuclear steam generators
}
F22B 37/248
. . . .
{
with a vertical cylindrical wall
}
Collapse
F22B 37/26
. .
Steam-separating arrangements (vapour-liquid separators, e.g. for drying steam, B01D; B04)
F22B 37/261
. . .
{
specially adapted for boiler drums
}
F22B 37/263
. . .
{
Valves with water separators
}
F22B 37/265
. . .
{
Apparatus for washing and purifying steam
}
F22B 37/266
. . .
{
Separator reheaters
}
F22B 37/268
. . .
{
specially adapted for steam generators of nuclear power plants
}
Collapse
F22B 37/28
. . .
involving reversal of direction of flow
F22B 37/283
. . . .
{
specially adapted for boiler drums
}
F22B 37/286
. . . .
{
specially adapted for steam generators of nuclear power plants
}
Collapse
F22B 37/30
. . .
using impingement against baffle separators
F22B 37/303
. . . .
{
specially adapted for boiler drums
}
F22B 37/306
. . . .
{
specially adapted for steam generators of nuclear power plants
}
Collapse
F22B 37/32
. . .
using centrifugal force
F22B 37/322
. . . .
{
specially adapted for boiler drums
}
F22B 37/325
. . . .
{
using a revolving element
}
F22B 37/327
. . . .
{
specially adapted for steam generators of nuclear power plants
}
F22B 37/34
. .
Adaptations of boilers for promoting water circulation (
{
F22B 13/145 takes precedence
}
; auxiliary devices for promoting water circulation F22D 7/00)
Collapse
F22B 37/36
. .
Arrangements for sheathing or casing boilers
F22B 37/365
. . .
{
Casings of metal sheets, e.g. expansion plates, expansible joints
}
F22B 37/38
. .
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)
F22B 37/40
. .
Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles (in flues or chimneys F23J 13/00)
Collapse
F22B 37/42
. .
Applications, arrangements, or dispositions of alarm or automatic safety devices (for feed-water heaters F22D 1/14;
{
emergency feed-water supply F22D 11/003
}
; alarms responsive to undesired or abnormal conditions G08B)
F22B 37/421
. . .
{
Arrangements for detecting leaks
}
F22B 37/423
. . .
{
Valves for testing steam generators
}
F22B 37/425
. . .
{
Feed-water supply alarm devices using floats
}
F22B 37/426
. . .
{
Feed-water supply alarm devices using electric signals
}
F22B 37/428
. . .
{
Feed-water supply alarm devices using dilatation of solids or liquids
}
Collapse
F22B 37/44
. . .
of safety valves (safety valves per se F16K)
F22B 37/443
. . . .
{
Safety devices extinguishing the fire
}
F22B 37/446
. . . .
{
Safety devices responsive to overpressure
}
F22B 37/46
. . .
responsive to low or high water level, e.g. for checking, suppressing, extinguishing combustion in boilers (fire-fighting, fire extinction in general A62)
Collapse
F22B 37/47
. . .
responsive to abnormal temperature, e.g. actuated by fusible plugs (such alarms or devices per se G08B)
F22B 37/475
. . . .
{
Safety devices with fusible plugs
}
Collapse
F22B 37/48
. .
Devices for removing water, salt, or sludge from boilers (cleaning internal or external surfaces of water tubes F28G); Arrangements of cleaning apparatus in boilers (cleaning external surfaces of tubes by soot blowers F23J); Combinations thereof with boilers
F22B 37/483
. . .
{
specially adapted for nuclear steam generators
}
F22B 37/486
. . .
{
Devices for removing water, salt, or sludge from boilers (F22B 37/483, F22B 37/50, F22B 37/52 and F22B 37/54 take precedence)
}
F22B 37/50
. . .
for draining or expelling water
F22B 37/52
. . .
Washing-out devices
Collapse
F22B 37/54
. . .
De-sludging or blow-down devices
{
(F22B 37/565 takes precedence)
}
F22B 37/545
. . . .
{
Valves specially adapted therefor (valves in general F16K)
}
Collapse
F22B 37/56
. .
Boiler cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down
F22B 37/565
. . .
{
Blow-down control, e.g. for ascertaining proper duration of boiler blow-down
}
F22B 37/58
. .
Removing tubes from headers or drums; Extracting tools
F22B 37/60
.
specially adapted for steam boilers of instantaneous or flash type
Collapse
F22B 37/62
.
specially adapted for steam boilers of forced-flow type
Collapse
F22B 37/64
. .
Mounting of, or supporting arrangements for, tube units (construction of tube walls of furnaces, e.g. boiler furnaces F23M 5/08)
F22B 37/645
. . .
{
involving upper vertically-disposed water tubes and lower horizontally- or helically disposed water tubes
}
F22B 37/66
. . .
involving vertically-disposed water tubes (F22B 37/645 takes precedence)
F22B 37/68
. . .
involving horizontally-disposed water tubes (F22B 37/645 takes precedence)
Collapse
F22B 37/70
. .
Arrangements for distributing water into water tubes
F22B 37/72
. . .
involving injection devices
F22B 37/74
. . .
Throttling arrangements for tubes or sets of tubes
F22B 37/76
.
Adaptations or mounting of devices for observing existence or direction of fluid flow (devices per se G01P)
F22B 37/78
.
Adaptations or mounting of level indicators (level indicators per se G01F)
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013