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IPC 7
F22D-F22D01106

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


F 22STEAM GENERATION (chemical or physical apparatus for generating gases B01J; chemical generation of gas, e.g. under pressure, Section C; removal of combustion products or residues, e.g. cleaning of the combustion contaminated surfaces of tubes of boilers, F23J; generating combustion products of high pressure or high velocity F23R; water heaters not for steam generation F24H, F28; cleaning of internal or external surfaces of heat-transfer conduits, e.g. water tubes of boilers, F28G)


F 22 DPREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER; FEED-WATER SUPPLY; CONTROLLING WATER LEVEL; CIRCULATING WATER WITHIN BOILERS (chemical treatment of water, e.g. purification, C02F; enclosed heat-exchange apparatus in general F28D; controlling in general G05)



1/

00Feed-water heaters, e.g. preheaters

1/

02.with water tubes arranged in the boiler furnace, fire tubes, or flue ways (heat-exchange tubes in general F28F)

1/

04..the tubes having plain outer surfaces, e.g. in vertical arrangement

1/

06...in horizontal arrangement

1/

08..the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement

1/

10...in horizontal arrangement (hollow fire-bars, grates, or the like used as water tubes F23H 3/02)

1/

12..Control devices, e.g. for regulating steam temperature

1/

14..Safety or venting devices (safety devices for boilers in general F22B 37/42)

1/

16.with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways

1/

18..and heated indirectly

1/

20..and directly connected to boilers

1/

22..and provided for rotary movement

1/

24.with fire tubes or flue ways traversing feed-water vessels

1/

26.with means, other than tubes, to separate water and heating medium, e.g. bulk heaters without internal flues or tubes, jacketted smoke-boxes or flues

1/

28.for direct heat transfer, e.g. by mixing water and steam

1/

30..with stages, steps, baffles, dishes, circular troughs, or other means to cause interrupted or cascading fall of water

1/

32.arranged to be heated by steam, e.g. bled from turbines

1/

34..and returning condensate to boiler with main feed supply

1/

36.Water and air preheating systems

1/

38..Constructional features of water and air preheating systems

1/

40.Combinations of exhaust-steam and smoke-gas preheaters (for locomotives F22D 1/42)

1/

42.specially adapted for locomotives

1/

44..Smoke-gas preheaters

1/

46..Exhaust-steam preheaters

1/

48..Details

1/

50.incorporating thermal de-aeration of feed-water (de-aeration produced in the course of direct heat transfer F22D 1/28; thermal de-aeration of water per se B01D 19/00, C02F 1/20; valves for venting F16K 24/04)  [3]


3/

00Accumulators for preheated water

3/

02.arranged within combustion chambers

3/

04.combined with steam accumulators

3/

06.directly connected to boilers

3/

08.specially adapted for locomotives (locomotive boilers F22B 13/06)

3/

10..Control devices (controlling water feed to boilers, or water level F22D 5/00)


5/

00Controlling water feed or water level; Automatic water feeding or water-level regulators (steam traps F16T; measuring or indicating instruments G01; for indicating water level G01F; level control in general G05D 9/00)

5/

02.with an intermediate compartment from which the water is fed by gravity after mechanically moving the compartment, the movement being controlled according to water level

5/

04.with pivoting buckets

5/

06.with receptacles external to, but in free communication with, the boilers and adapted to move up and down in accordance with change in water level

5/

08.with float-actuated valves

5/

10..and with pistons or membranes unitary with the feed inlet valves

5/

12..and with dipping tubes

5/

14.responsive to thermal expansion and contraction, e.g. of solid elements

5/

16..of fluids

5/

18.for varying the speed or delivery pressure of feed pumps

5/

20..without floats

5/

22..with floats

5/

24.with electric switches

5/

26.Automatic feed-control systems (automatic safety devices F22B 37/42; controlling in general G05)

5/

28..responsive to amount of steam withdrawn; responsive to steam pressure

5/

30..responsive to both water level and amount of steam withdrawn or steam pressure

5/

32..influencing the speed or delivery pressure of the feed pumps

5/

34..Applications of valves (valves per se F16K)

5/

36..for feeding a number of steam boilers designed for different ranges of temperature and pressure


7/

00Auxiliary devices or apparatus for promoting water circulation

7/

02.Saddles or like directing plates fitted to furnace tubes

7/

04.Injectors for water or steam

7/

06.Rotary devices, e.g. propellers

7/

08..Arrangements of pumps, e.g. outside the boilers

7/

10...within the boilers

7/

12.Control devices

7/

14.specially adapted for locomotive boilers


11/

00Feed-water supply not provided for in other main groups

11/

02.Arrangements of feed-water pumps (F22D 11/06 takes precedence; pumps per se F04)

11/

04..with means to eliminate steam formation

11/

06..for returning condensate to boiler


  
 

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