Process Equipment and Plant Design
Lug support is

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

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Process Equipment and Plant Design
In case of design of a shell and tube heat exchanger,

All of these
O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres
Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter
Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch

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

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

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