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
F 22 B 1/00; combustion apparatus per seF 23)
31
/
02
•
Installation of water-tube boilers in chimneys, e.g. in converter chimneys
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
31
/
06
•
•
Installation of emergency heat supply
31
/
08
•
Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
Steam-generation plants; Control systems
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 B 63 H 21/00)
33
/
02
•
Combinations of boilers having a single combustion apparatus in common
33
/
04
•
•
of boilers of furnace-tube type with boilers of water-tube type
33
/
06
•
•
of boilers of furnace-tube type with boilers of fire-tube type
33
/
08
•
•
of boilers of water-tube type with boilers of fire-tube type
33
/
10
•
•
of two or more superposed boilers with separate water volumes and operating with two or more separate water levels
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
33
/
14
•
Combinations of low- and high-pressure boilers
33
/
16
•
•
of forced-flow type
33
/
18
•
Combinations of steam boilers with other apparatus
35
/
00
Control systems for steam boilers (regulation or control of steam power plants F 01 K 7/00
; for regulating feed-water supply F 22 D; for controlling superheat temperature F 22 G 5/00; control of combustion F 23 N; regulating or controlling in general G 05)
35
/
02
•
for steam boilers with natural convection circulation
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
35
/
06
•
for steam boilers of forced-flow type
35
/
08
•
•
of forced-circulation type
35
/
10
•
•
of once-through type
35
/
12
•
•
•
operating at critical or supercritical pressure
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
35
/
16
•
•
responsive to the percentage of steam in the mixture of steam and water
35
/
18
•
Applications of computers to steam-boiler control
37
/
00
Component parts or details of steam boilers (venting devices
F 16 K 24/00; steam traps or like apparatus F 16 T)
37
/
02
•
applicable to more than one kind or type of steam boiler
37
/
04
•
•
and characterised by material, e.g. use of special steel alloy
37
/
06
•
•
Flue or fire tubes; Accessories therefor, e.g. fire-tube inserts
37
/
08
•
•
•
Fittings preventing burning-off of the tube edges
37
/
10
•
•
Water tubes; Accessories therefor (working of metal tubes B 21 D; pipes in general F 16 L; repairing leaks in water tubes
F 16 L 55/16, F 28 F 11/00; cleaning water tubes of boilers F 23 J, F 28 G; baffles, screens, or deflectors formed of water tubes F 23 M 9/10)
37
/
12
•
•
•
Forms of water tubes, e.g. of varying cross-section
37
/
14
•
•
•
Supply mains, e.g. rising mains, down-comers, in connection with water tubes
37
/
16
•
•
•
Return bends
37
/
18
•
•
•
Inserts, e.g. for receiving deposits from water
37
/
20
•
•
•
Supporting arrangements, e.g. for securing water-tube sets (construction of tube walls of furnaces including boiler furnaces F 23 M 5/08)
37
/
22
•
•
Drums; Headers; Accessories therefor (making boilers from sheet metal B 21 D 51/24; pressure vessels in general
F 16 J 12/00; covers or similar closure members for pressure vessels in general F 16 J 13/00)
37
/
24
•
•
Supporting, suspending, or setting arrangements, e.g. heat shielding (frames, engine beds F 16 M)
37
/
26
•
•
Steam-separating arrangements (vapour-liquid separators, e.g. for drying steam, B 01 D, B 04)
37
/
28
•
•
•
involving reversal of direction of flow
37
/
30
•
•
•
using impingement against baffle separators
37
/
32
•
•
•
using centrifugal force
37
/
34
•
•
Adaptations of boilers for promoting water circulation (auxiliary apparatus F 22 D 7/00)
37
/
36
•
•
Arrangements for sheathing or casing boilers
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 G 01)
37
/
40
•
•
Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles (in flues or chimneys
F 23 J 13/00)
37
/
42
•
•
Applications, arrangements, or dispositions of alarm or automatic safety devices (for feed-water heaters F 22 D 1/14; alarms responsive to undesired or abnormal conditions G 08 B)
responsive to low or high water level, e.g. for checking, suppressing, extinguishing combustion in boilers (fire-fighting, fire extinction in general A 62)
37
/
47
•
•
•
responsive to abnormal temperature, e.g. actuated by fusible plugs (such alarms or devices per seG 08 B)
37
/
48
•
•
Devices or arrangements for removing water, minerals, or sludge from boilers (cleaning water tubes, furnace tubes, or the like of boilers F 23 J, F 28 G)
Note
Group F 22 B 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
/
50
•
•
•
for draining or expelling water
37
/
52
•
•
•
Washing-out devices
37
/
54
•
•
•
De-sludging or blow-down devices
37
/
56
•
•
Boiler-cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down
37
/
58
•
•
Removing tubes from headers or drums; Extracting tools
37
/
60
•
specially adapted for steam boilers of instantaneous or flash type
37
/
62
•
specially adapted for steam boilers of forced-flow type
37
/
64
•
•
Mounting of, or supporting arrangements for, tube units (construction of tube walls of furnaces, e.g. boiler furnaces F 23 M 5/08)
37
/
66
•
•
•
involving vertically-disposed water tubes
37
/
68
•
•
•
involving horizontally-disposed water tubes
37
/
70
•
•
Arrangements for distributing water into water tubes
37
/
72
•
•
•
involving injection devices
37
/
74
•
•
•
Throttling arrangements for tubes or sets of tubes
37
/
76
•
Adaptations or mounting of devices for observing existence or direction of fluid flow (devices per seG 01 P)
37
/
78
•
Adaptations or mounting of level indicators (level indicators per seG 01 F)
