Hyd.Test after repair

[robi70]

I have to install a 3/4" nozzle in a H.Pressure exchanger designed in acc. with ASME VIII di. 2.
I'm not performin any welds on the pressure resistand body.
Is the Hyd.Test requested? if yes for which article?

Thanks

 

[deanc]

Your question is not real clear. Review the current NBIC.

 

[unclesyd]

Your statement is somewhat contradictory when say “installed in” and later say “no welds on a pressure restrained body”. The question is where could you install a nozzle on a vessel and not be with the limits of the vessel as defined by the code.

On a Div II vessel the designer should sign off on the addition if it is added to the vessel and specify if a hydrotest is needed. Either the joursdictional agency’s or the insurance agency’s authorized inspector should have signed off on the addition and possibly of requiring a repair plan.
I don’t think anyone can answer your question without a little more detail and what jurisdictions you are under.

Having said that, small nozzles (2" and under) usually don’t cause any problems, but on a Div II vessel it requires some more effort to get the job done right.

 

[robi70]

The exchanger is made by 80 mm C.S (pressure resistant body)+ 5 mm S.S. liner plate (against corrosion).
The nozzle will be istalled and welded directly to the internal loose liner plate.
We choose this solution to avoid the repetition of the PWHT.

 

[unclesyd]

If this is a loose liner with no connections to the shell, no pressure considerations and the nozzle doesn't penetrate the pressure boundary of the vessel there is no problem.