with water tubes arranged in the boiler furnaces, fire tubes or flue ways

Full Title

Feed-water heaters, i.e. economisers or like preheaters > with water tubes arranged in the boiler furnaces, fire tubes or flue ways

Child Classifications

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• F22D 1/04 the tubes having plain outer surfaces, e.g. in vertical arrangement
• F22D 1/08 the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement
• F22D 1/12 Control devices, e.g. for regulating steam temperature
• F22D 1/14 Safety or venting devices