Process Equipment and Plant Design
Lug support is

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

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

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
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

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Process Equipment and Plant Design
A stuffing box is used for

Prevention of fluid leakage around moving parts
Facilitating smooth opening and closing of a valve
Absorbing the contraction/expansion of pipeline due to temperature changes
Reducing the resistance of fluid flow

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