downcomer

noun

Definition of downcomer

  1. :  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

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Origin and Etymology of downcomer

2down + comer


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