downcomer
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English[edit]
Etymology[edit]
Noun[edit]
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.