What is the purpose of recessed inlet sumps under the downcomer?
Recessed sumps are used for very high liquid rates as this permits an adequate escape area under the downcomer without resorting to taller overflow weirs. (A taller overflow weir can reduce capacity, by increasing pressure drop and downcomer backup.) Recessed sumps should not be used as a means of maintaining a downcomer seal for low liquid rate services, because of the difficulty in preventing leakage from the sumps. An inlet weir would be more appropriate. Recessed inlet sumps should not be used in those services where plugging could occur.
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