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

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

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Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Weir length for a bubble cap plate is the same as that for the seive plate
The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns
Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate
Weir height for a bubble cap plate column is the same as that for a seive plate column

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