Process Equipment and Plant Design
Seamless pipe is made

Both B and C
By extrusion & casting into static and centrifugal molds
By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing
From rolled strips formed into cylinders and seam-welded

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Process Equipment and Plant Design
A stuffing box is used for

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

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