Process Equipment and Plant Design
Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of

Making the joint leak proof
None of these
Reduction of discontinuity in shape at the junction
Preventing the local overstressing of the shell around the opening

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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
Both B & C
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

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