Process Equipment and Plant Design
Lug support is

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

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Process Equipment and Plant Design
Bubble cap tray is the most commonly used tray in large distillation column, because

It incurs less pressure drop as compared to any other try designed for the same duty
None of these
Of its flexibility and nearly constant efficiency under varying conditions of operation
It eliminates the foaming and entrain-ment tendency during operation

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