Process Equipment and Plant Design
Lug support is

Same as bracket support
The most suitable for thick vertical vessel
Provided usually for vessels of much smaller height than skirt supported vessels
All of these

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

All of these
Facilitate draining out liquid from a tray when the unit is not in operation
Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation
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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