Downcomer
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Downcomer [1]
(1): ( n.) A pipe to conduct something downwards;
(2): ( n.) A pipe for leading the hot gases from the top of a blast furnace downward to the regenerators, boilers, etc.
(3): ( n.) In some water-tube boilers, a tube larger in diameter than the water tubes to conduct the water from each top drum to a bottom drum, thus completing the circulation.
