Process Equipment and Plant Design
Stage efficiency for packed tower varies with the

Fluid rates and fluid properties
Operating pressure and column diameter
Type & size of packing
All of these

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

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

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