Process Equipment and Plant Design
Wind load consideration in the design of a support can be neglected, when the vessel is

Short (< 2 m) and housed indoor
Tall but empty
Tall (say 30 metres), but is full of liquid
None of these

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

Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid
All of these
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

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