Process Equipment and Plant Design
In a shell and tube heat exchanger, the 'tube pitch' is defined as the

None of these
Shortest distance between two adj acent tube holes
Shortest centre to centre distance between adjacent tubes
O.D. of the tube for square pitch

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

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Process Equipment and Plant Design
A stuffing box is used for

Reducing the resistance of fluid flow
Prevention of fluid leakage around moving parts
Absorbing the contraction/expansion of pipeline due to temperature changes
Facilitating smooth opening and closing of a valve

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