downcomer

English

Etymology

down +‎ comer

Noun

downcomer (plural downcomers)

  1. A pipe to conduct something downwards.
    1. 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.
    2. A pipe for leading the hot gases from the top of a blast furnace downward to the regenerators, boilers, etc.
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