Process Equipment and Plant Design
Seamless pipe is made

By extrusion & casting into static and centrifugal molds
Both B and C
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
Pick out the wrong statement pertaining to the design of the distillation column.

If sufficient slot area is not provided, the gas may pass through the skirt clearance
Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up
None of these
The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles

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