Feed-water heaters, i.e. economisers or like preheaters

Introduced: September 1968

Title

Titles differ between systems:

IPC: Feed-water heaters, e.g. preheaters

CPC: Feed-water heaters, i.e. economisers or like preheaters

Full titles differ between systems:

IPC:

Feed-water heaters, e.g. preheaters

CPC:

Feed-water heaters, i.e. economisers or like preheaters

Of 12 combined children, 10 exist in both systems.

2 codes are CPC-only extensions.

2 shared codes have differing titles between IPC and CPC.

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F22D 1/003 CPC only CPC only
F22D 1/006 CPC only CPC only
F22D 1/02 with water tubes arranged in the boiler furnaces, fire tubes or flue ways IPC+CPC Available in IPC and CPC
F22D 1/16 with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways IPC+CPC Available in IPC and CPC
F22D 1/24 with fire tubes or flue ways traversing feed-water vessels IPC+CPC Available in IPC and CPC
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 flue or flues IPC+CPC Available in IPC and CPC
F22D 1/28 for direct heat transfer, e.g. by mixing water and steam IPC+CPC Available in IPC and CPC
F22D 1/32 arranged to be heated by steam, e.g. bled from turbines +1 CPC IPC+CPC Available in IPC and CPC
F22D 1/36 Water and air preheating systems IPC+CPC Available in IPC and CPC
F22D 1/40 Combinations of exhaust-steam and smoke-gas preheaters IPC+CPC Available in IPC and CPC
F22D 1/42 specially adapted for locomotives IPC+CPC Available in IPC and CPC
F22D 1/50 incorporating thermal de-aeration of feed-water (de-aeration produced in the course of direct heat transfer F22D1/28) since 1980 IPC+CPC Available in IPC and CPC

Class F22,2013–2023, worldwide · Source: EPO PATSTAT

Class F22,2013–2023, worldwide · Source: EPO PATSTAT