Process Equipment and Plant Design
Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

Plain carbon steel and cast iron parts are used
Material of construction is high alloy steel
Wall thickness is > 30 mm
Both B & C

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

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

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

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Process Equipment and Plant Design
A stuffing box is used for

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

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