Process Equipment and Plant Design
If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will __________ times.

Increase by 1.8
Increase by 21.6
Decrease by 22
None of these

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Process Equipment and Plant Design
A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design

Only if the opening is on spherical vessel
Only if the opening is on a horizontal cylinderical vessel
Only if the opening is on a vertical cylinderical vessel
Irrespective of the shape of the vessel

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