Process Equipment and Plant Design
The necessary wall thickness for a metallic storage vessel is a function of the

All of these
Diameter of the vessel
Ultimate tensile strength (or yield point) of the material and operating temperature
Operating pressure and welding/joint efficiency

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Process Equipment and Plant Design
The function of manholes provided in the shell of a distillation column is to

Give access to the individual trays for cleaning, maintenance and installation
All of these
Guard against foaming & entrainment by dumping antifoaming agent through it
Keep a check on the liquid gradient over the plate by direct visual observation

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Process Equipment and Plant Design
Seamless pipe is made

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
By extrusion & casting into static and centrifugal molds
From rolled strips formed into cylinders and seam-welded

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