SET PRESSURE FOR PRESSURE RELIEF VALVE FOR HYDROTESTING OF POWER PIPING

[shailesh dave]

Dear Mr Dave

Could you please resend this query with proper subject line? And also in future please don’t hit reply button while starting new thread, instead u can create new mail and send to

material...@googlegroups.com

 

Best regards

Raghuram Bathula

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From: shailesh dave [mailto:snd...@yahoo.com]
Sent: Wednesday, January 30, 2008 1:46 PM
To: material...@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

 

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[Raghuram Bathula]

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: material...@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
>

> ---------------------------------

[shailesh dave]

DEAR Mr. RAGHURAM,

 

THANKS FOR THE REPLY.

 

REGARDS,

 

S.N.DAVE

Raghuram Bathula <raghura...@gmail.com> wrote:

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[gopal sankar]

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 <raghura...@gmail.com> wrote:

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[nachiket vagal]

I think the set pressure is 3% above the test pressure.....Shank

shailesh dave <snd...@yahoo.com> wrote:

Try it now.

[Sankepalli R.S.Reddy]

As per aramco project specifications, Test RVs to be set at 5% above test pressure and tested within 1week/1month for new projects/maintenance work, respectively.

regards

[srini vasan]

dear reddy

 

can i know in what std in aramco mentioned to test the RV 5% Above test pressure.

 

with regards

N.Srinivasan

[Valiullah Sarpanch]

SAES-A-004

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[Ratheesh Ramachandran]

Dear Mr. Srinivasan,

you can refer to SAES A 004 for relief valve set pressure requirements

regards
Ratheesh.R
Ksa

[LALU RAJENDRAN]

Dear Mr. Dave 

As per our client's requirement, we calibrate the RV at 1.1 times of the actual test pressure.

Regards 

LALU R.P

[ashbandy...@gmail.com]

Agree, for pneumatic tests the RVs are set at 110 percent of test pressure followed by reducing the pressure to 90 percent of test pressure and further reducing it to design pressure or operating pressure and go for the weld snoop test.

regards,

ashish bandyopadhyay

> material...@googlegroups.com

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[Vinay Thattey]

pressure range of RV is also important.

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