The function of manholes provided in the shell of a distillation column is to __________________?

Process Equipment and Plant Design 15/06/2021

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

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