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Differential Hydro test on Shell and Tube Heat Exchanger

Differential Hydro test on Shell and Tube Heat Exchanger

Differential Hydro test on Shell and Tube Heat Exchanger

Hi Gents,
I have a Shell & Tube Heat Exchanger running to the following design pressure conditions: at 2200 psig on tube side and 220 psig at shell side.
Background history points out this exchanger have always been hydro tested thru differential hydro test. However, drawing does not call for hydro test, and shell side has been designed for full vacuum.

It is my understanding, when an important difference between shell and tube design pressure exists, we should go for differential hydro test in order to protect the tube-sheet. On the other hand, vendor will point out on drawing something like "this exchanger has been designed for differential hydro test"
The fact the shell has been designed for full vacuum has to do something with doing or not differential hydro test?

Thank you very much. I will appreciate your valuable feedback on this matter


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