Process Equipment and Plant Design
Diameter of the seive tray column is determined by the

Lower limit of vapour velocity
Hole diameter of the seive tray
Upper limit of the vapour velocity
Height of the plate spacing

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Process Equipment and Plant Design
A stuffing box is used for

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

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