Process Equipment and Plant Design
If 'D' is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of

D/5 or minimum 2" to D
None of these
D/2 or minimum 2" to 5D
D/5 or minimum 2" to 5D

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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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