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

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

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Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Weir height for a bubble cap plate column is the same as that for a seive plate column
The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns
Weir length for a bubble cap plate is the same as that for the seive plate
Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate

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