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

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

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Process Equipment and Plant Design
Weep holes provided in the plates of a distillation column

Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid
Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation
Facilitate draining out liquid from a tray when the unit is not in operation
All of these

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