Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

Sensible heat differences are small, because the temperature changes from tray to tray is small
Trouton's rule is applicable
All of these
Liquid/vapor loading across the column remains constant

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Process Equipment and Plant Design
A stuffing box is used for

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

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