As nouns the difference between terms and downcomer
is that terms is while downcomer is 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.
terms
English
Noun
(head)
Statistics
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downcomer
English
Noun
(
en noun)
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.