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

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

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Process Equipment and Plant Design
Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

Reflux is not a saturated liquid
Heat of mixing of normal liquid is assumed to be zero
Molar latent heat of the two components are equal
Sensible heat changes for vapour & liquid are negligibly small

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