Process Equipment and Plant Design
Lug support is

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

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Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Ideal trays required to the number of real trays required
Overall gas transfer units to the number of ideal trays required
Real trays required to the number of ideal trays required
None of these

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