DOWNCOMER

Etymology

Noun

downcomer (plural downcomers)

A pipe to conduct something downwards.

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.

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

Source: Wiktionary

Down"com`er, n. A pipe to conduct something downwards; specif.: (a) (Iron Manuf.) A pipe for leading the hot gases from the top of a blast furnace downward to the regenerators, boilers, etc. (b) (Steam Engin.) 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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