Process Equipment and Plant Design
Spherical shaped pressure vessel is considered to be the most ideal, because it can

Be designed without wind load considerations
Be fabricated very easily
Withstand higher pressure for a given metallic shell thickness
Be supported very easily

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

It eliminates the foaming and entrain-ment tendency during operation
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

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