Process Equipment and Plant Design
Which of the following is used to set the diameter of the distillation column?

Number of theorectical plates
Static submergence
Length of straight rectangular weir on cross-flow tray
Allowable vapour velocity

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Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Weir length for a bubble cap plate is the same as that for the seive plate
Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate
The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns
Weir height for a bubble cap plate column is the same as that for a seive plate column

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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
Reducing the resistance of fluid flow
Prevention of fluid leakage around moving parts

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