Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body

Child Classifications

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• F22B 9/02 the boiler body being disposed upright, e.g. above the combustion chamber
• F22B 9/10 the boiler body being disposed substantially horizontally, e.g. at the side of the combustion chamber
• F22B 9/16 the boiler body containing fire tubes disposed crosswise in inclined upward arrangement
• F22B 9/18 Component parts thereof; Accessories therefor, e.g. stay-bolt connections