downcomer

noun

: a pipe to conduct something downward: such as

a

: a pipe for leading the hot gases from the top of a blast furnace downward to the dust collectors and flue system

b

: a tube larger in diameter than the water tubes in some watertube boilers to conduct water from each top drum to a bottom drum under the influence of thermal circulation

Word History

Etymology

down entry 2 + comer

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