WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

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 1/00 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)}

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)}

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

F22B 1/06 ・・the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium

F22B 1/063 ・・・{for metal cooled nuclear reactors (heat-exchangers having a liquid metal as heat exchange medium F28D 7/00C)}

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)}

F22B 1/08 ・・the heat carrier being steam

F22B 1/10 ・・・released from heat accumulators

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}

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}

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 15/00B)}

F22B 1/167 ・・・{using an organic fluid}

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)

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}

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}

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

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

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}

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}

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}

F22B 1/30 ・・Electrode boilers

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}

F22B 3/00 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

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

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

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)

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

F22B 7/02 ・without auxiliary water tubes

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

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

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

F22B 9/02 ・the boiler body being disposed upright, e.g. above the combustion chamber

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

F22B 9/10 ・the boiler body being disposed substantially horizontally, e.g. at the side of the combustion chamber

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

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

F22B 11/02 ・the fire tubes being in upright arrangement

F22B 11/04 ・the fire tubes being in horizontal arrangement

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

F22B 13/005 ・{with flues, other than fire tubes}

F22B 13/02 ・mounted in fixed position with the boiler body disposed upright

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

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

F22B 13/10 ・・with auxiliary water tubes inside the fire-box

F22B 13/12 ・・・the auxiliary water tubes lining the fire-box

F22B 13/14 ・Component parts thereof; Accessories therefor

F22B 13/145 ・・{Firebox thermosiphons}

F22B 13/16 ・・Stay-bolt connections, e.g. rigid connections

F22B 13/18 ・・・Flexible connections, e.g. of ball-and-socket type

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

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

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

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

F22B 17/16 ・Component parts thereof; Accessories therefor

F22B 17/18 ・・Header boxes; Sectional headers

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

F22B 21/00 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}

F22B 21/02 ・built-up from substantially straight water tubes

F22B 21/04 ・・involving a single upper drum and a single lower drum, e.g. the drums being arranged transversely

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}

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

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}

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

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

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

F22B 21/30 ・・bent in U-loop form

F22B 21/32 ・・・disposed horizontally in abutting connection with upright headers or rising water mains

F22B 21/34 ・built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers

F22B 21/341 ・・{Vertical radiation boilers with combustion in the lower part}

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}

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

F22B 23/00 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)

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

F22B 27/00 Instantaneous or flash steam boilers

F22B 27/02 ・built-up from fire tubes

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)}

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}

F22B 29/00 Steam boilers of forced-flow type

F22B 29/02 ・of forced-circulation type {(F22B 29/06 takes precedence)}

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

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)

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

F22B 31/00 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)

F22B 31/0007 ・{with combustion in a fluidized bed (fluidized bed apparatus per se B01J 8/00; fluidized bed combustors F23C 11/02)}

F22B 31/0015 ・・{for boilers of the water tube type}

F22B 31/0023 ・・・{with tubes in the bed (F22B 31/003 takes precedence)}

F22B 31/003 ・・・{with tubes surrounding the bed or with water tube wall partitions}

F22B 31/0038 ・・・・{with tubes in the bed}

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}

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

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

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 B63H 21/00)

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

F22B 33/14 ・Combination of low and high pressure boilers (F22B 13/065 takes precedence)

F22B 33/16 ・・of forced-flow type

F22B 33/18 ・Combinations of steam boilers with other apparatus

F22B 33/185 ・・{in combination with a steam accumulator}

F22B 35/00 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)}

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

F22B 35/06 ・for steam boilers of forced-flow type

F22B 35/08 ・・of forced-circulation type

F22B 35/083 ・・・{without drum, i.e. without hot water storage in the boiler}

F22B 35/086 ・・・・{operating at critical or supercritical pressure}

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}

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

F22B 37/00 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}

F22B 37/002 ・{specially adapted for nuclear steam generators, e.g. maintenance, repairing or inspecting equipment not otherwise provided for}

F22B 37/003 ・・{Maintenance, repairing or inspecting equipment positioned in or via the headers}

F22B 37/005 ・・・{Positioning apparatus specially adapted therefor (F22B 37/70C3 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)}

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

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

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)

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}

F22B 37/107 ・・・{Protection of water tubes (in general F16L 57/00)}

F22B 37/108 ・・・・{Protection of water tube walls}

F22B 37/12 ・・・Forms of water tubes, e.g. of varying cross-section

F22B 37/125 ・・・・{Bifurcates}

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}

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

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}

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}

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}

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)

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}

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}

F22B 37/246 ・・・{for steam generators of the reservoir type, e.g. nuclear steam generators}

F22B 37/248 ・・・・{with a vertical cylindrical wall}

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}

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}

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}

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)

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)

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}

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)

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}

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

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)}

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

F22B 37/62 ・specially adapted for steam boilers of forced-flow type

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)

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)