F
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  
LIGHTING AND HEATING
 F22
STEAM GENERATION (chemical or physical apparatus for generating gases B01J; chemical generation of gas, e.g. under pressure, Section C; generating combustion products of high pressure or high velocity F23R)
 F22

Note(s)

In this class, the term "steam" also covers other condensable vapours, 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, C02B; enclosed heat-exchange apparatus in general F28D; controlling in general G05)
 F22D 1/00
Feed-water heaters, i.e. economisers or like 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 (de-aeration apparatus C02B 1/10)
 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 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 per se 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