downcomer

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English

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Etymology

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From down +‎ comer.

Noun

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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.