F22B   1/00		ǮˡηħȯˡΣ	Methods of steam generation characterised by form of heating method	4483
F22B   1/02		ǮΤǮ̤Ѥˤ	by exploitation of the heat content of hot heat carriers	3218
F22B   1/04		ǮΤǮ饰ǮޤǮǤΡ㡥Ŵ	the heat carrier being hot slag, hot residues, or heated blocks, e.g. iron blocks	758
F22B   1/06		ǮΤͻƤΡͻ°㡥ǮãΤȤƤΰλ	the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium	1801
F22B   1/08		ǮΤǤ	the heat carrier being steam	776
F22B   1/10		Ǯ狼Фˤ	released from heat accumulators	73
F22B   1/12		Ūʼˤä	produced by an indirect cyclic process	258
F22B   1/14		Х륯ޤʮ̸οľܿ	coming in direct contact with water in bulk or in sprays	261
F22B   1/16		ǮΤǮΤޤǮ㡥ѱաѾǤ	the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour	2136
F22B   1/18		ǮΤǮ㡥ǳؤӵΤȤѥǤΡΣ	the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines	12216
F22B   1/20		ۼϱФ줿ǮѤΡܥ	using heat evolved in a solution absorbing steam; Soda steam boilers	296
F22B   1/22		¼Ū絤ʾΰϤˤǳƤѤ	using combustion under pressure substantially exceeding atmospheric pressure	2232
F22B   1/24		ðǳƾܥ顤㡥̵ܶܥǳƼǮˤäƺư	Pressure-fired steam boilers, e.g. using turbo air compressors actuated by hot gases from boiler furnace	146
F22B   1/26		ǳƷξܥ顤ʤб꤬ȯ˰ϤޤƤޤͤ	Steam boilers of submerged-flame type, i.e. the flame being surrounded by, or impinging on, the water to be vaporised	400
F22B   1/28		ŵǮܥ	in boilers heated electrically	9609
F22B   1/30		Ŷ˥ܥ	Electrode boilers	1423
F22B   3/00		¾ξȯˡΥ֥饹¾Υ롼פʬवʤܥ	Other methods of steam generation; Steam boilers not provided for in other groups of this subclass	711
F22B   3/02		ʳκưΤλѤޤ	involving the use of working media other than water	547
F22B   3/04		ǹⰵǮΰϤ㲼뤳ȤˤΡ㡥졼Σ	by drop in pressure of high-pressure hot water within pressure-reducing chambers, e.g. in accumulators	1393
F22B   3/06		ŪѴˤΡ㡥ưͥ륮Ǯͥ륮Ѵ	by transformation of mechanical, e.g. kinetic, energy into heat energy	291
F22B   3/08		׳ޤĶ׳ϤΤȤˤ	at critical or supercritical pressure values	226
F22B   5/00		ɥ෿ξܥ顤ʤ˲ϧޤϱɤʤΤǳƥȳɽ̤ܿ	Steam boilers of drum type, i.e. without internal furnace or fire tubes, the boiler body being contacted externally by flue gas	473
F22B   5/02		γ¦ɤͭ	with auxiliary water tubes outside the boiler body	65
F22B   5/04		ʬ°ʪΣ	Component parts thereof; Accessories therefor	49
F22B   7/00		ϧξܥ顤ʤǳǳƤߤ줿ܤޤϤʾϧǹԤʤ	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	445
F22B   7/02		ɤʤ	without auxiliary water tubes	91
F22B   7/04		ɤ	with auxiliary water tubes	127
F22B   7/06		ϧ˲Ū󤵤Ƥ	inside the furnace tube in transverse arrangement	118
F22B   7/08		ϧ˽Ĥ󤵤Ƥ	inside the furnace tube in longitudinal arrangement	72
F22B   7/10		γˤ	outside the boiler body	23
F22B   7/12		ɤΡɴ󤻼ǳƥεž򵯤	with auxiliary fire tubes; Arrangement of header boxes providing for return diversion of flue gas flow	648
F22B   7/14		ɤɤξͭ	with both auxiliary water tubes and auxiliary fire tubes	80
F22B   7/16		ʬ°ʪ㡥ƥܥϢ	Component parts thereof; Accessories therefor, e.g. stay-bolt connections	429
F22B   7/18		ƻɹ¤ǳƥɴ󤻼	Walling of flues; Flue-gas header boxes	41
F22B   7/20		ϧ	Furnace tubes	140
F22B   9/00		ɷξܥ顤ʤǳƼǳƥߤ줿ɷ̤äƴΤγήΡΣ	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	234
F22B   9/02		Τľ㡥ǳƼξ֤ΡΣ	the boiler body being disposed upright, e.g. above the combustion chamber	158
F22B   9/04		ɤΩˤ줿ΡΣ	the fire tubes being in upright arrangement	345
F22B   9/06		ɴȢ󤬱ƻήεž򵯤ΡΣ	Arrangement of header boxes providing for return diversion of flue gas flow	27
F22B   9/08		ɤʿ󤵤ΡΣ	the fire tubes being in horizontal arrangement	72
F22B   9/10		Τ¼Ū˿ʿ㡥ǳƼ¦ɡ󤵤ΡΣ	the boiler body being disposed substantially horizontally, e.g. at the side of the combustion chamber	99
F22B   9/12		ɤ¼Ū˿ʿ֤ΡΣ	the fire tubes being in substantially-horizontal arrangement	280
F22B   9/14		ɴ󤻼󤬱ƻήεž򵯤ΡΣ	Arrangement of header boxes providing for return diversion of flue gas flow	57
F22B   9/16		Τ˷ФƲ֤줿ɤͭΡΣ	the boiler body containing fire tubes disposed crosswise in inclined upward arrangement	13
F22B   9/18		ʬ°ʪ㡥ƥܥϢΣ	Component parts thereof; Accessories therefor, e.g. stay-bolt connections	141
F22B  11/00		ɷȿɷȤ߹蘆줿ܥ顤ʤɷξܥ餬ɤͭ	Steam boilers of combined fire-tube type and water-tube type, i.e. steam boilers of fire-tube type having auxiliary water tubes	323
F22B  11/02		ɤľ󤵤	the fire tubes being in upright arrangement	74
F22B  11/04		ɤʿ󤵤	the fire tubes being in horizontal arrangement	66
F22B  13/00		мξܥ顤ʤϧӤ³дɤޤϱɤξ֤ƤܥΣ	Steam boilers of fire-box type, i.e. boilers where both combustion chambers and subsequent flues or fire tubes are arranged within the boiler body	437
F22B  13/02		Τľ֤Ƹ֤Ǥդ	mounted in fixed position with the boiler body disposed upright	422
F22B  13/04		Τ¼Ū˿ʿ֤Ƹ֤Ǥդ	mounted in fixed position with the boiler body disposed substantially horizontally	114
F22B  13/06		Ͼ屿žؼ֡ؼ֡ޤϵؼ֥ܥ	Locomobile, traction-engine, steam-roller, or locomotive boilers	237
F22B  13/08		мɤʤ	without auxiliary water tubes inside the fire-box	105
F22B  13/10		мɤ	with auxiliary water tubes inside the fire-box	121
F22B  13/12		мɤ¤٤	the auxiliary water tubes lining the fire-box	136
F22B  13/14		ʬ°ʪ	Component parts thereof; Accessories therefor	267
F22B  13/16		ƥܥϢ롤㡥Ϣ	Stay-bolt connections, e.g. rigid connections	13
F22B  13/18		̼Ϣ롤㡥ܡ롦åȷ	Flexible connections, e.g. of ball-and-socket type	12
F22B  15/00		ʿοɥܥ顤ʤɤʿ󤵤Ƥ	Water-tube boilers of horizontal type, i.e. the water-tube sets being arranged horizontally	376
F22B  17/00		ʿзοɥܥ顤ʤȤʿ̤Ф¿ФƤ	Water-tube boilers of horizontally-inclined type, i.e. the water-tube sets being inclined slightly with respect to the horizontal plane	123
F22B  17/02		٤ƤȤ˶̤룲Ĥδɴ󤻼ͤ³줿ȤȤ߾夲줿Ρ㡥ʿʴɴ󤻼ͭ	built-up from water-tube sets in abutting connection with two header boxes in common for all sets, e.g. with flat header boxes	149
F22B  17/04		Ȥȿ˷ФƤΡ㡥򺹤褦	the water-tube sets being inclined in opposite directions, e.g. crosswise	16
F22B  17/06		ɤѤʤƶʤäƤ	the water-tube sets being bent angularly	4
F22B  17/08		ɤ֤Ƥ	the water-tube sets being curved	20
F22B  17/10		ΤΤȤȤˣߤ줿ʬŪɴ󤻼ͤ³줿ȤȤ߾夲줿ΡʤܥޤϹ⤵ˤ錄äʣʬߤ줿ɴ󤻤ͭ	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	363
F22B  17/12		ʬŪɴ󤻤ľˤޤϼ¼Ū˿ľ֤줿	the sectional headers being in vertical or substantially-vertical arrangement	185
F22B  17/14		ʬŪɴ󤻤ʿˤޤϼ¼Ū˿ʿ֤줿	the sectional headers being in horizontal or substantially-horizontal arrangement	7
F22B  17/16		ʬ°ʪ	Component parts thereof; Accessories therefor	179
F22B  17/18		ɴ󤻼ʬŪɴ	Header boxes; Sectional headers	19
F22B  19/00		ʿзȿľȤ߹蘆줿ɥܥ顤ʤʿзοɥܥ餬ľޤϼ¼Ū˿ľ󤵤줿ɤͭ	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	144
F22B  21/00		ľޤϱԤзοɥܥ顤ʤȤľޤϼ¼Ū˿ľ󤵤줿	Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically	780
F22B  21/02		¼Ū˿äʿɤȤ߾夲줿	built-up from substantially-straight water tubes	292
F22B  21/04		ĤξɥपӣĤβɥޤΡ㡥ɥबŪ֤	involving a single upper drum and a single lower drum, e.g. the drums being arranged transversely	645
F22B  21/06		ɤľȤˤʤ褦󤵤Ρ㡥ľΥɥͤ³	the water tubes being arranged annularly in sets, e.g. in abutting connection with drums of annular shape	706
F22B  21/08		ɤʬ褦󤵤ƥ롼פޤϽˤʤäƤΡ㡥üޤ֤Ƥ	the water tubes being arranged sectionally in groups or in banks, e.g. bent over at their ends	356
F22B  21/10		ɤߤ㤤󤵤	the water tubes being arranged in staggered rows	13
F22B  21/12		ʾξɥपӣʾβɥबΡ㡥ɥͤ³줿󤹤Ȥͭ	involving two or more upper drums and two or more lower drums, e.g. with crosswise-arranged water-tube sets in abutting connection with drums	230
F22B  21/14		Ĥξɥपӣʾβɥब	involving a single upper drum and two or more lower drums	164
F22B  21/16		ɥबʤɤˤߤϢ뤵	the lower drums being interconnected by further water tubes	8
F22B  21/18		ʾξɥपӣĤβɥब	involving two or more upper drums and a single lower drum	166
F22B  21/20		ΤΤοɥåȤ˸̤󤵤줿ʬŪʤޤʬ䤵줿ɴ󤻤	involving sectional or subdivided headers in separate arrangement for each water-tube set	97
F22B  21/22		ľɤޤϼ¼Ūľɰʳοɤʤ	built-up from water tubes of form other than straight or substantially straight	200
F22B  21/24		ʤ꤯ͤä˶ʤ	bent in serpentine or sinuous form	149
F22B  21/26		˶ʤʤˤ줿	bent helically, i.e. coiled	267
F22B  21/28		˶ʤ	bent spirally	56
F22B  21/30		ջ˶ʤ	bent in U-loop form	84
F22B  21/32		Ωɴ󤻤ޤϵ夬äɤͤ碌³ƿʿ󤵤줿	disposed horizontally in abutting connection with upright headers or rising water mains	11
F22B  21/34		ǳƼϤѥ֤ͥ˥롼ײ줿ɤˤȤΩƤ줿Ρʤͥܥ	built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers	1235
F22B  21/36		ǳƼξüߤ줿ɥޤϴɴ󤻤	involving an upper drum or headers mounted at the top of the combustion chamber	195
F22B  21/38		ʬ㡥ץϥּѥͥ	Component parts thereof, e.g. prefabricated panels	37
F22B  21/40		Ū˿ľĹߤɤˤȤΩƤΡʤܥ	built-up from water tubes arranged in a comparatively long vertical shaft, i.e. tower boilers	60
F22B  23/00		ֳ֤äƣŤȤ줿ɤͭ꥿󷿤οɤüǥܥɥޤϥإåȢͤ³Ƥʤ륻åȤȤ߾夲줿ʤüĺ줿֤줿ɤͭեɴɤȤ߾夲줿ɥܥΣ	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 	165
F22B  23/02		ɡʤեɴɡΥåȤʿޤϼ¼Ū˿ʿǤ	the water-tube, i.e. Field-tube, sets being horizontal or substantially horizontal	20
F22B  23/04		ɡʤեɴɡΥåȤľޤϼ¼Ū˿ľǤ	the water-tube, i.e. Field-tube, sets being vertical or substantially vertical	53
F22B  23/06		ιʡ㡥եɿɡΣ	Component parts thereof, e.g. Field water tubes	33
F22B  25/00		ɤ̤äƱӤ褦֤줿ƻɡޤϱɡͭɤΥåȤȤ߾夲줿ɥܥ	Water-tube boilers built-up from sets of water tubes with internally-arranged flue tubes, or fire tubes, extending through the water tubes	195
F22B  27/00		ִ֤ޤϥեå弰ܥ	Instantaneous or flash steam boilers	294
F22B  27/02		ɤȤ߾夲줿	built-up from fire tubes	38
F22B  27/04		ɤȤ߾夲줿Ρʣƣ£ƣ£ͥ	built-up from water tubes(<b>F22B27/12 to F22B27/16</b>  take precedence)	115
F22B  27/06		عԤޤ϶ʤ꤯ͤä֤˶ʤ줿	bent in serpentine or sinuous form	50
F22B  27/08		˶ʤ줿ʤˤ줿	bent helically, i.e. coiled	149
F22B  27/10		˶ʤ줿	bent spirally	31
F22B  27/12		žǮǡ㡥ȤΩΡȤ߾夲줿	built-up from rotary heat-exchange elements, e.g. from tube assemblies	172
F22B  27/14		Ǯݻɤ̩ļߤ줿ǮǤȤ߾夲줿	built-up from heat-exchange elements arranged within a confined chamber having heat-retaining walls	155
F22B  27/16		ⲹǮǤξˤޤˡ㡥ɤˡγҤʮ̸ޤ륹ץ쥤Υ뤬	involving spray nozzles for sprinkling or injecting water particles on to or into hot heat-exchange elements, e.g. into tubes	438
F22B  29/00		ήưξܥ	Steam boilers of forced-flow type	155
F22B  29/02		۴ķΣ	of forced-circulation type	606
F22B  29/04		Ȥ߹碌۴ķʤǮȤδ֤źˤή۴ĤղŪˡ㡥ŪʰϿˤ롤ˤä礵	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	54
F22B  29/06		ήʤɤΰüε夬¾üǮȤӽФΡ㰵ӹⰵܥȤ߹碌ήưܥƣ£ˡΣ	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 (combined low- and high-pressure boilers of forced-flow type <b>F22B33/16</b>)	815
F22B  29/08		ʾȯκǽ֤ꤵƱž	operating with fixed point of final state of complete evaporation	188
F22B  29/10		ʾȯκǽ֤ưƱž	operating with sliding point of final state of complete evaporation	80
F22B  29/12		ưٱưδֺƽ۴ĤäƱžΡ㡥ܥ	operating with superimposed recirculation during starting and low-load periods, e.g. composite boilers	137
F22B  31/00		ǳ֤Τդˤܥ鹽¤ޤϴɷνǳ֤ޤ֡Σ	Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus	4661
F22B  31/02		οɥܥΤդ㡥žϧα	Installation of water-tube boilers in chimneys, e.g. in converter chimneys	98
F22B  31/04		ĤޤϤʾǳ֤ˤǮ㡥ܥ餪ӲǮѤˤ줾ʬΥ줿ǳ	Heat supply by installation of two or more combustion apparatus, e.g. of separate combustion apparatus for the boiler and the superheater respectively	697
F22B  31/06		۵޲Ǯ	Installation of emergency heat supply	15
F22B  31/08		ǳѲǮΤΥܥ֤ޤǮ֤Τդ	Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion	4920
F22B  33/00		ȯץȡ㡥ߤϢȤۤʤ륿פξܥͭΡΣ	Steam-generation plants, e.g. comprising steam boilers of different types in mutual association	1530
F22B  33/02		̤ΣĤǳ֤ͭܥȤ߹碌	Combinations of boilers having a single combustion apparatus in common	73
F22B  33/04		ϧܥȿɥܥȤ߹碌	of boilers of furnace-tube type with boilers of water-tube type	142
F22B  33/06		ϧܥȱɥܥȤ߹碌	of boilers of furnace-tube type with boilers of fire-tube type	12
F22B  33/08		ɥܥȱɥܥȤ߹碌	of boilers of water-tube type with boilers of fire-tube type	127
F22B  33/10		Ω̤Ω̤Ǳž룲ʾ¿ťܥȤ߹碌	of two or more superposed boilers with separate water volumes and operating with two or more separate water levels	32
F22B  33/12		Ωܥ顤ʤĤΥ˥åȤȤƾܥ顤ǳ֡ǳ塤°浪ͭ	Self-contained steam boilers, i.e. comprising as a unit the steam boiler, the combustion apparatus, the fuel storage, accessory machines, and equipment	231
F22B  33/14		㰵ӹⰵܥȤ߹碌	Combinations of low- and high-pressure boilers	234
F22B  33/16		ήư	of forced-flow type	24
F22B  33/18		ܥ¾֤Ȥ߹碌	Combinations of steam boilers with other apparatus	5381
F22B  35/00		ܥϡʵĴƣģǮƣǣˡΣ	Control systems for steam boilers (for regulating feed-water supply <b>F22D5/00</b>;  for controlling superheat temperature <b>F22G5/00</b>)	8536
F22B  35/02		۴Ĥξܥ	for steam boilers with natural convection circulation	78
F22B  35/04		ưˤΡʤϧФƤܥ̾αž٤ãޤǤεưˤ	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	139
F22B  35/06		ήưξܥ	for steam boilers of forced-flow type	182
F22B  35/08		۴ķˤ	of forced-circulation type	147
F22B  35/10		ήˤ	of once-through type	813
F22B  35/12		׳ޤĶ׳Ǳž	operating at critical or supercritical pressure	150
F22B  35/14		ưˤΡʤϧФƤܥ̾αž٤ãޤǤεưˤ	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	563
F22B  35/16		庮ʪξγˤ	responsive to the percentage of steam in the mixture of steam and water	44
F22B  35/18		ŻѤܥˤ	Applications of computers to steam-boiler control	998
F22B  37/00		ܥιʬޤϺΣ	Component parts or details of steam boilers	6377
F22B  37/02		ޤϣʾξܥˤŬѤǤ	applicable to more than one kind or type of steam boiler	2375
F22B  37/04		㡥üλѡħΤ	and characterised by material, e.g. use of special steel alloy	427
F22B  37/06		ƻɤޤϱɡ°ʪ㡥ɤؤʪ	Flue or fire tubes; Accessories therefor, e.g. fire-tube inserts	833
F22B  37/08		üξ»ɻߤ뤿μդ	Fittings preventing burning-off of the tube edges	72
F22B  37/10		ɡ°ʪΣ	Water tubes; Accessories therefor	4307
F22B  37/12		ɤη㡥̷Τ	Forms of water tubes, e.g. of varying cross-section	533
F22B  37/14		ʡ㡥ɤ³ʡ߿	Supply mains, e.g. rising mains, down-comers, in connection with water tubes	982
F22B  37/16			Return bends	96
F22B  37/18		ʪ㡥夫ʪ	Inserts, e.g. for receiving deposits from water	178
F22B  37/20		ٻ֡㡥ɰ켰ꤹ뤿ΤΡΣ	Supporting arrangements, e.g. for securing water-tube sets	2201
F22B  37/22		ɥࡨɴ󤻡°ʪΣ	Drums; Headers; Accessories therefor	2759
F22B  37/24		ٻߤޤϤդ֡㡥ǮΤΤΡΣ	Supporting, suspending or setting arrangements, e.g. heat shielding	2924
F22B  37/26		ʬΥ֡Σ	Steam-separating arrangements	3518
F22B  37/28		ήž	involving reversal of direction of flow	293
F22B  37/30		ʬΥμĤФ׷Ѥ	using impingement against baffle separators	637
F22B  37/32		ϤѤ	using centrifugal force	801
F22B  37/34		۴Ĥʤ뤿Υܥ°ʡʿ۴Ĥʤ뤿֣ƣģ	Adaptations of boilers for promoting water circulation(auxiliary devices for promoting water circulation <b>F22D7/00</b>)	354
F22B  37/36		ܥʤ	Arrangements for sheathing or casing boilers	1306
F22B  37/38		ܥαž֤¬ޤϻؼ㡥ɤήޤή̤δƻΣ	Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes	2639
F22B  37/40		ܥαƻʬɤ㡥ĤǷ줿ΡΣ	Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles	439
F22B  37/42		֤ޤϼư֤Ŭѡޤ֡ʵǮѣƣģˡΣ	Applications, arrangements or dispositions of alarm or automatic safety devices (for feed-water heaters <b>F22D1/14</b>)	2820
F22B  37/44		ۤΡΣ	of safety valves	1045
F22B  37/46		̤ޤϹ̤˱Ρ㡥ܥ顼ǳѡѤޤϾòѡΣ	responsive to low or high water level, e.g. for checking, suppressing or extinguishing combustion in boilers	1042
F22B  37/47		۾ﲹ٤˱Ρ㡥ץ饰ˤưΡΣ	responsive to abnormal temperature, e.g. actuated by fusible plugs	540
F22B  37/48		ܥ餫塤̵ʪޤϥå뵡ޤ֡ʥܥοɡϧݣƣǡˡΣ<br><br><b><ul></ul></b><br>Σ<br>롼ףƣ£ϥܥ餬ưѤ륷ƥࡤޤϥܥ餬ư˽֤ˤȤɤޤ륷ƥࡤޤ¾ΤɤΤ褦ʸѤȼʤܥäŬѤ륷ƥΤߤޤ롣	Devices or arrangements for removing water, minerals or sludge from boilers (cleaning water tubes, furnace tubes or the like of boilers <b>F28G</b>);<br><br><b><u>Note(s)</u></b><br><br><ul><li>Group <b>F22B37/48</b><u>covers</u> 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. </li></ul>	1868
F22B  37/50		ӿ	for draining or expelling water	1307
F22B  37/52			Washing-out devices	1313
F22B  37/54		åޤϥ֥	De-sludging or blow-down devices	3951
F22B  37/56		ܥ֡㡥ܥΥ֥Ŭڤʻ³μ¤ˤ	Boiler-cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down	1180
F22B  37/58		ɴ󤻤ޤϥɥफδɤνй	Removing tubes from headers or drums; Extracting tools	126
F22B  37/60		ִŪޤϥեåξܥäŬ	specially adapted for steam boilers of instantaneous or flash type	56
F22B  37/62		ήưξܥäŬ礹	specially adapted for steam boilers of forced-flow type	31
F22B  37/64		ñΤΤդޤϻٻ֡Σ	Mounting of, or supporting arrangements for, tube units	125
F22B  37/66		ľ֤줿ɤ	involving vertically-disposed water tubes	54
F22B  37/68		ʿ֤줿ɤ	involving horizontally-disposed water tubes	49
F22B  37/70		ɤ˿ʬ	Arrangements for distributing water into water tubes	81
F22B  37/72			involving injection devices	27
F22B  37/74		ɤޤϴȤΩΤιʤ	Throttling arrangements for tubes or sets of tubes	138
F22B  37/76		ήή¸ߤޤѻ֤ŬѤޤϤդΣ	Adaptations or mounting of devices for observing existence or direction of fluid flow	53
F22B  37/78		٥ؼŬѤޤϤդΣ	Adaptations or mounting of level indicators	1276
