Process Equipment and Plant Design
Bubble cap plate column is

Used only for distillation, not for absorption
A continuous contactor
A finite stage contactor
A differential stage contactor

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Process Equipment and Plant Design
Seamless pipe is made

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
Both B and C

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