Process Equipment and Plant Design
Bubble cap tray is the most commonly used tray in large distillation column, because

It eliminates the foaming and entrain-ment tendency during operation
Of its flexibility and nearly constant efficiency under varying conditions of operation
None of these
It incurs less pressure drop as compared to any other try designed for the same duty

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Process Equipment and Plant Design
A stuffing box is used for

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

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