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

Equal to the tube diameter
More than the tube diameter
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

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the distillation column.

If sufficient slot area is not provided, the gas may pass through the skirt clearance
None of these
The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles
Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up

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