F
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  
LIGHTING; HEATING
 F22
STEAM 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)
 F22

Note(s)

In this class, the following term is used with the meaning indicated:

  • "steam" covers also other condensable vapours, e.g. mercury, diphenyl, diphenyl oxide.

 F22D
PREHEATING, 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)
 F22D 1/00
Feed-water heaters, e.g. preheaters
 F22D 1/02
·  with water tubes arranged in the boiler furnace, fire tubes, or flue ways (heat-exchange tubes in general F28F)
 F22D 1/04
·  ·  the tubes having plain outer surfaces, e.g. in vertical arrangement
 F22D 1/06
·  ·  ·  in horizontal arrangement
 F22D 1/08
·  ·  the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement
 F22D 1/10
·  ·  ·  in horizontal arrangement (hollow fire-bars, grates, or the like used as water tubes F23H 3/02)
 F22D 1/12
·  ·  Control devices, e.g. for regulating steam temperature
 F22D 1/14
·  ·  Safety or venting devices (safety devices for boilers in general F22B 37/42)
 F22D 1/16
·  with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways
 F22D 1/18
·  ·  and heated indirectly
 F22D 1/20
·  ·  and directly connected to boilers
 F22D 1/22
·  ·  and provided for rotary movement
 F22D 1/24
·  with fire tubes or flue ways traversing feed-water vessels
 F22D 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
 F22D 1/28
·  for direct heat transfer, e.g. by mixing water and steam
 F22D 1/30
·  ·  with stages, steps, baffles, dishes, circular troughs, or other means to cause interrupted or cascading fall of water
 F22D 1/32
·  arranged to be heated by steam, e.g. bled from turbines
 F22D 1/34
·  ·  and returning condensate to boiler with main feed supply
 F22D 1/36
·  Water and air preheating systems
 F22D 1/38
·  ·  Constructional features of water and air preheating systems
 F22D 1/40
·  Combinations of exhaust-steam and smoke-gas preheaters (for locomotives F22D 1/42)
 F22D 1/42
·  specially adapted for locomotives
 F22D 1/44
·  ·  Smoke-gas preheaters
 F22D 1/46
·  ·  Exhaust-steam preheaters
 F22D 1/48
·  ·  Details
 F22D 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]
 F22D 3/00
Accumulators for preheated water
 F22D 3/02
·  arranged within combustion chambers
 F22D 3/04
·  combined with steam accumulators
 F22D 3/06
·  directly connected to boilers
 F22D 3/08
·  specially adapted for locomotives (locomotive boilers F22B 13/06)
 F22D 3/10
·  ·  Control devices (controlling water feed to boilers, or water level F22D 5/00)
 F22D 5/00
Controlling 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)
 F22D 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
 F22D 5/04
·  with pivoting buckets
 F22D 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
 F22D 5/08
·  with float-actuated valves
 F22D 5/10
·  ·  and with pistons or membranes unitary with the feed inlet valves
 F22D 5/12
·  ·  and with dipping tubes
 F22D 5/14
·  responsive to thermal expansion and contraction, e.g. of solid elements
 F22D 5/16
·  ·  of fluids
 F22D 5/18
·  for varying the speed or delivery pressure of feed pumps
 F22D 5/20
·  ·  without floats
 F22D 5/22
·  ·  with floats
 F22D 5/24
·  with electric switches
 F22D 5/26
·  Automatic feed-control systems (automatic safety devices F22B 37/42; controlling in general G05)
 F22D 5/28
·  ·  responsive to amount of steam withdrawn; responsive to steam pressure
 F22D 5/30
·  ·  responsive to both water level and amount of steam withdrawn or steam pressure
 F22D 5/32
·  ·  influencing the speed or delivery pressure of the feed pumps
 F22D 5/34
·  ·  Applications of valves (valves per se F16K)
 F22D 5/36
·  ·  for feeding a number of steam boilers designed for different ranges of temperature and pressure
 F22D 7/00
Auxiliary devices or apparatus for promoting water circulation
 F22D 7/02
·  Saddles or like directing plates fitted to furnace tubes
 F22D 7/04
·  Injectors for water or steam
 F22D 7/06
·  Rotary devices, e.g. propellers
 F22D 7/08
·  ·  Arrangements of pumps, e.g. outside the boilers
 F22D 7/10
·  ·  ·  within the boilers
 F22D 7/12
·  Control devices
 F22D 7/14
·  specially adapted for locomotive boilers
 F22D 11/00
Feed-water supply not provided for in other main groups
 F22D 11/02
·  Arrangements of feed-water pumps (F22D 11/06 takes precedence; pumps per se F04)
 F22D 11/04
·  ·  with means to eliminate steam formation
 F22D 11/06
·  ·  for returning condensate to boiler