Process Equipment and Plant Design
In a multipass shell and tube heat exchanger, the problem of differential expansion between the shell and tube passes is taken care of by using a

Neither A nor B
Either A or B
U-bend
Floating head tube sheet

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the clearance of the tube is generally

Not less than one-fourth of the tube diameter or 3/16"
More in case of triangular pitch as compared to the square pitch tube layout
Equal to the tube diameter
More than the tube diameter

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