Process Equipment and Plant Design
In a shell and tube heat exchanger, the 'tube pitch' is defined as the

O.D. of the tube for square pitch
Shortest distance between two adj acent tube holes
Shortest centre to centre distance between adjacent tubes
None of these

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

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

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