Process Equipment and Plant Design
Spherical shaped pressure vessel is considered to be the most ideal, because it can

Be supported very easily
Be fabricated very easily
Be designed without wind load considerations
Withstand higher pressure for a given metallic shell thickness

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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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