Process Equipment and Plant Design
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always

More than arithmetic mean value
Less than arithmetic mean value
Both B & C
More than geometric mean value

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Process Equipment and Plant Design
Weep holes provided in the plates of a distillation column

Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation
Facilitate draining out liquid from a tray when the unit is not in operation
All of these
Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid

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