Process Equipment and Plant Design
An adequate clearance between the tray and the shell wall of a distillation column is provided to

Drain the liquid from the tray when the unit is not in operation
Avoid back-trapping
None of these
Allow for thermal expansion and facilitate installation

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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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