Process Equipment and Plant Design
The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called

Skirt clearance
None of these
Static submergence
Downcomer liquid seal

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Process Equipment and Plant Design
A stuffing box is used for

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
Reducing the resistance of fluid flow

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