Process Equipment and Plant Design
A stuffing box is used for

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

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Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Real trays required to the number of ideal trays required
Ideal trays required to the number of real trays required
None of these
Overall gas transfer units to the number of ideal trays required

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