Process Equipment and Plant Design
Optimum economic pipe diameter for fluid flow is determined by the

None of these
Density of the fluid
Total cost considerations (pumping cost plus fixed cost of the pipe)
Viscosity of the fluid

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Process Equipment and Plant Design
Seamless pipe is made

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

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