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Hyd.Test after repair

Hyd.Test after repair

Hyd.Test after repair

(OP)
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   

RE: Hyd.Test after repair

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

RE: Hyd.Test after repair

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.   

RE: Hyd.Test after repair

(OP)
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.  

RE: Hyd.Test after repair

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.

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