Definitions from Wiktionary (downcomer)

▸ noun:  A pipe to conduct something downwards.
▸ noun:  A large external pipe in a water-tube boiler, carrying unheated water from the steam drum down to the water drum as part of the circulation path.
▸ noun:  A pipe for leading the hot gases from the top of a blast furnace downward to the regenerators, boilers, etc.




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