Process Equipment and Plant Design
High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

Shell side for large overall heat transfer co-efficient
Tubes to avoid the expansion of high pressure shell construction
Shell side for smaller total pressure drop
Shell side, if the flow is counter-current and tube side if the flow is co-current

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

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

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