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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Process Equipment and Plant Design
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Permits the use of less tubes in a given shell diameter
Permits the use of more tubes in a given shell diameter
Both B and C
Facilitates comparatively easier external cleaning because of large clearance

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.

Steam is fed to the shell, whereas the liquor is filled inside the tube
None of these
Liquor level is maintained at l/3rd to 1/2 of the height of the tube
Tube dia is 3-6 cms, while tube length in 3-6 metres

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Process Equipment and Plant Design
The LMTD correction factor (FT) is defined as the

Differenced of true temperature difference and the LMTD
Geometric mean of the true temperature difference and the LMTD
Ratio of true temperature difference to the LMTD
Ratio of LMTD to the true temperature difference

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