Process Equipment and Plant Design
Generally, elliptical dished heads

All of these
Are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D
Resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter
Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m²

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Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

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

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Process Equipment and Plant Design
Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.

The corrosive and fouling fluid should be preferably routed through the tubes
Higher pressure fluid stream should be routed through the shell side
Lower flow rate fluid should be routed through the shell side
The viscous fluid should be routed through the shell side

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