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
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle
Is economical in operation
Employs high velocity, high heat transfer rate and less heating surface requirement
Both B & C

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