Process Equipment and Plant Design
Wind load consideration in the design of a support can be neglected, when the vessel is

Short (< 2 m) and housed indoor
Tall (say 30 metres), but is full of liquid
None of these
Tall but empty

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Process Equipment and Plant Design
Seamless pipe is made

From rolled strips formed into cylinders and seam-welded
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
Both B and C

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Process Equipment and Plant Design
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Permits the use of more tubes in a given shell diameter
Permits the use of less tubes in a given shell diameter
Facilitates comparatively easier external cleaning because of large clearance
Both B and C

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