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

All of these
Give access to the individual trays for cleaning, maintenance and installation
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
Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method

Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method
All of these
Is more accurate in finding the number of equilibrium stages
Accounts for the enthalpy changes in the process

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Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Only the function of condensation is to be carried out
Both the functions of condensation & sub cooling are carried out in a single unit
Sub cooling of condensate is desired
Hydrostatic head is required for refluxing the condensate

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