Process Equipment and Plant Design
For a given design of bubble cap, the number of bubble caps to be used per tray is set by the

Diameter of the column
Allowable gas velocity through the slots
All of these
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
Reducing the resistance of fluid flow
Absorbing the contraction/expansion of pipeline due to temperature changes
Prevention of fluid leakage around moving parts

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