|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

LIGHTING; HEATING

|  | F22 |
STEAM GENERATION (chemical or physical apparatus for generating gases Fulltext... Hierarchy... Expanded...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, Fulltext... Hierarchy... Expanded...F23J; generating combustion products of high pressure or high velocity Fulltext... Hierarchy... Expanded...F23R; water heaters not for steam generation Fulltext... Hierarchy... Expanded...F24H, Fulltext... Hierarchy... Expanded...F28; cleaning of internal or external surfaces of heat-transfer conduits, e.g. water tubes of boilers, Fulltext... Hierarchy... Expanded...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, Fulltext... Hierarchy... Expanded...C02F; enclosed heat-exchange apparatus in general Fulltext... Hierarchy... Expanded...F28D; controlling in general Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...F22D 1/28; thermal de-aeration of water per se Fulltext... Hierarchy... Expanded...B01D 19/00, Fulltext... Hierarchy... Expanded...C02F 1/20; valves for venting Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...F22B 13/06)

|  | F22D 3/10 |
· · | Control devices (controlling water feed to boilers, or water level Fulltext... Hierarchy... Expanded...F22D 5/00)

|  | F22D 5/00 |
Controlling water feed or water level; Automatic water feeding or water-level regulators (steam traps Fulltext... Hierarchy... Expanded...F16T; measuring or indicating instruments Fulltext... Hierarchy... Expanded...G01; for indicating water level Fulltext... Hierarchy... Expanded...G01F; level control in general Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...F22B 37/42; controlling in general Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...F22D 11/06 takes precedence; pumps per se Fulltext... Hierarchy... Expanded...F04)

|  | F22D 11/04 |
· · | with means to eliminate steam formation

|  | F22D 11/06 |
· · | for returning condensate to boiler