Process Equipment and Plant Design
A stuffing box is used for

Reducing the resistance of fluid flow
Prevention of fluid leakage around moving parts
Absorbing the contraction/expansion of pipeline due to temperature changes
Facilitating smooth opening and closing of a valve

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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
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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