Process Equipment and Plant Design
A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

Straight flange section and corner torus section
Corner torus section and central dished section
Central dished section and straight flange section
Central dished section and corner torus section

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

None of these
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
Of its flexibility and nearly constant efficiency under varying conditions of operation

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