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

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

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

The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles
None of these
If sufficient slot area is not provided, the gas may pass through the skirt clearance
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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