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

Child Classifications

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