CPC Definition - Subclass F22D
This place covers:
This subclass covers general aspects of, or methods for, preheating or accumulating feed water for steam generation. All devices in a power plant or a steam boiler for heating water in liquid form, like economisers or water preheaters and accumulating water for preheating purposes, controlling and regulating the water level in said water accumulators, feed-water supply like automatic water feeding and controlling methods are covered. Furthermore safety feed water supply and arrangements of feed water pumps are also covered.
Water heaters in general are classified in F24H. Generation of steam or vapour is classified in F22B, devices and methods for superheating steam in F22G. Steam engine plants where engine aspects predominate are classified in F01K, domestic central heating systems using steam are classified in F24D, heat exchange or heat transfer in general is classified in F28.
Attention is drawn to the following places, which may be of interest for search:
Cooking vessels | |
Apparatus for making beverages | |
Baking, Roasting, Grilling, Frying | |
Machines for cleaning floors, carpets, furniture, walls, or wall coverings with arrangements for steam generation | |
Water heater arrangements for cleaning windows | |
Bathing devices for special therapeutic or hygienic purposes | |
Degasification of liquids or water | |
Cleaning by methods involving the use or presence of liquid steam | |
Treatment of water, waste water, or sewage | |
Washing machines with steam generation | |
Hand irons | |
Use of steam extracted from the engine for feed-water purposes | |
Use of two or more feed-water heaters in series | |
Use of desuperheaters for feed water heating | |
Water heaters for domestic or space-heating systems | |
Controlling in general | |
Water heaters heated by electric, magnetic or electromagnetic fields |
In this place, the following terms or expressions are used with the meaning indicated:
Economiser | heat exchanger for heating feed water normally beyond the boiling point improving the boiler's efficiency |
This place covers:
General aspects and constructional features of devices or heat exchangers for heating water normally beyond the boiling point in order to improve the boiler's efficiency arranged in a flow path up stream of an evaporator. This group covers also economisers and preheaters with water tube arranged in the boiler furnace, in fire tubes or in flue ways, with water tubes arranged outside the boiler furnace and heated for example in a separate heat exchanger. Furthermore also water and air preheating systems, combinations of exhaust-steam and smoke-gas water preheater and preheaters incorporating thermal de-aeration are covered.
Attention is drawn to the following places, which may be of interest for search:
Control of feed-water heaters | |
Thermal de-aeration of water per se | |
Liebig degassing water | |
Valves for venting | |
Heat exchange apparatus in boiler for heating air supplied for combustion | |
Safety devices for boilers in general | |
Hollow fire-bars, grates, or the like used as water tubes |
In this place, the following terms or expressions are used with the meaning indicated:
Economiser | feed water heater |
This place covers:
Accumulators and storage vessels for water which is heated in an economiser arranged within the combustion chamber or combined with steam accumulators and thereby heated by steam or connected directly to boilers by water conduits. Water accumulators with preheated water specially adapted for locomotives and control devices are also covered by this group.
Attention is drawn to the following places, which may be of interest for search:
Control of feed water heaters; water-level and feeding | |
Plants characterised by the use of steam or heat accumulators | |
Vehicles being a steam locomotive | |
Steam boilers of fire-box type, locomotive boilers |
This place covers:
Devices and methods for controlling the supply of feed water and the feed water level using intermediate compartments, pivoting buckets, receptacles outside of the boiler and devices with float actuated valves, responsive to thermal expansion and contraction, with electric switches. Also regulators with varying the speed or delivery pressure of feed pumps and automatic feed-control systems are covered by said group.
This place does not cover:
Attention is drawn to the following places, which may be of interest for search:
Control devices for feed water heaters with water tubes arranged in the boiler furnace | |
Arrangements of feed water pumps | |
Control devices of plants characterised by condensers | |
Control system for two or more steam generators including feeding | |
Applications and arrangements of alarm or automatic safety devices for steam boilers |
This place covers:
Devices in for promoting or enhancing water circulation like saddles, deflecting plates, Venturi arrangements, injectors for water or steam, rotary devices like for example pumps, said devices also specially adapted for locomotive boilers. Control devises of said devices are also covered by said group.
This place does not cover:
Adaptation of boilers for promoting water circulation |
Attention is drawn to the following places, which may be of interest for search:
Control devices for feed water heaters with water tubes arranged in the boiler furnace | |
Vehicles being a steam locomotive |
This place covers:
All other aspects of feed water supply, which are not covered by the other main groups, like for example emergency feed water supply, arrangements of feed water cleaning, when the water is cleaned between condenser and boiler and arrangements of feed water pumps
Attention is drawn to the following places, which may be of interest for search:
Feed water heater with direct heat transfer like mixing water with steam | |
Water and air preheating systems | |
Auxiliary devices or apparatus for promoting water circulation | |
Arrangements or modifications of condensate or air pumps | |
Regenerating steam by compression done by an injection apparatus | |
Treating live steam, other than thermo-dynamically, cleaning and filtering | |
Applications and arrangements of alarm or automatic safety devices for steam boilers |
Only feed water supply devices and methods for which there is no entry in the main group F22D 7/00 are to be classified in F22D 11/00.