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
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

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Process Equipment and Plant Design
A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

Central dished section and straight flange section
Straight flange section and corner torus section
Corner torus section and central dished section
Central dished section and corner torus section

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