Process Equipment and Plant Design
Shortest distance between two tubes is

Called tube clearance
More in case of triangular pitch as compared to square pitch of tube layout
None of these
Called tube pitch

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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
More than the tube diameter
Equal to the tube diameter

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