Process Equipment and Plant Design
A claming section before the liquid flows into the downcomer is privided to

Ensure better vapour-liquid contact
Cool the liquid before it flows down
Reduce the discharge fluctuation
Permit release of entrained vapour in the liquid

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Process Equipment and Plant Design
The function of manholes provided in the shell of a distillation column is to

All of these
Guard against foaming & entrainment by dumping antifoaming agent through it
Give access to the individual trays for cleaning, maintenance and installation
Keep a check on the liquid gradient over the plate by direct visual observation

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