Process Equipment and Plant Design
A stuffing box is used for

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

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Process Equipment and Plant Design
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell
Remains same throughout
Decreases upwards
Increases upwards

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