[MW:541] Re: SET PRESSURE FOR PRESSURE RELIEF VALVE FOR HYDROTESTING OF POWER PIPING

Safety valve set pressure and system hydrotest pressure both are different concept.Safety valve set pressure is the maximum operating pressure for the particular system while in operation. Whereas the hydrotest pressure is meant to check the integrity of pipeline/vessel after fabrication/carrying modification & repair without using the process fluid. In general the safety valve set pressure is less than the system hydrotest pressure. In old practice hydrotest pressure will be 1.5 times the system design pressure and now it has been reduced to 1.3 times and IBR requirements will vary with ASME requirements.

gopalsankar

DM(INSPECTION)
Raghuram Bathula <raghurambathula@gmail.com> wrote:

When conditions require that a pressure test will be maintained for a
period of time during which the testing medium in the system would be
subject to thermal expansion, provision should be made for relief of
excess pressure.

I have no idea about any code requirement but normal practice as per
my experience for Valve Setting Pressure is Test pressure plus
lesser of 10 psi (0.69 Bar a) or 7% of the test pressure



> From: shailesh dave [mailto:snd2...@yahoo.com]
> Sent: Wednesday, January 30, 2008 1:46 PM
> To: materials-welding@googlegroups.com
> Subject: Re: [MW:537] Re: 533] Filler metal for P 11 (O/L SS 347) to P8
>
> Dear Members,
>
> Can anybody tell me at what pressure of hydrotest be safety relief valve set. What is the reference code.
>
> Regards,
>
> S.N.Dave
>
> QA/QC Manager
>
> ---------------------------------
> Never miss a thing. Make Yahoo your homepage.

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