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

More than the tube diameter
Equal to 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 about the design of seive plate column and the bubble cap column.

Weir length for a bubble cap plate is the same as that for the seive plate
Weir height for a bubble cap plate column is the same as that for a seive plate column
The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns
Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate

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