火管 meaning in English

fire tube
fire-tube
flame (or fire) tube
furnace flue
smoke tube

Shell boilers - requirements for equipment for the boiler
火管锅炉.锅炉用设备的要求
Shell boilers - design and calculation for pressure parts
火管锅炉.压力零件的设计和计算
Inspection on the operation of an automatic fire - tube boiler
视察自动火管式锅炉的操作。
Shell boilers - part 11 : acceptance tests
火管锅炉.第11部分:验收试验
Shell boilers - part 6 : requirements for equipment for the boiler
火管锅炉.第6部分:锅炉设备要求

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