Hydrotest for high pressure piping

[tong tong]

Dear All,

I have one tie-in point. The material is SA 312 TP316L. The test pressure is 350 bar and operating pressure is 250 bar. The big problem is there are no isolation point so hydrotest can't be performed on it. When I refer to API 570, clause 8.2.6 stated that when a pressure test is not necessary or practical, NDE shall be utilized in lieu of a pressure test. Due to this line is high pressure, is it enough only perform the NDT ? How suppose i do to convince our management level regarding integrity of the weldment ? Please help me. Thank in advance and you cooperation is highly appreciated 

Regards

Tong2je

[prakash kamathuru]

Dear tong,

 

At the end point of your tie in just weld one flange and do your hydro test and after your hydro test cut the flange and connect your tie in to other end with wlding and perrform 100% RT.the jont is universal acceptable as a golden joint if it is satisfactory with 100% RT.Previously same procedure i fallowed for 670 bar test pressure.

 

If you have still doubts regarding this please revert back to me.

 

regards,

 

Prakash K B

 

[Kural]

Tong

 

what is the applicable code 31.3 or 31.1 or something else. is it in construction or the system is in service.

 

It is common to practice as a closure weld (similar to tie in) in b31.3 in construction/ inservice.

 

Regards

Kural

[Nick Davies]

Tong,

 

you should perform a pressure test on the pipeline, do you have valves in the line? there must be some tie-in points or valves in the line?

 

Nick Davies

--
Regards,

Nick Davies

[Sivashankar Nagamanickamsundaramoorthy]

Dear Tong,   In addition to the Radiogrpahy at the end, carry out Dye penetrant test during Edge preparation , After Root, After 50% of the welding and after the final welding, inorder to ensure the integrity of the joint. This is the universally being followed in all industries.   Regards,   Siva

[rajan elamaran]

Tie in joints are always consider as a golden joint.generally there is no hydrotest is require for the golden joint. instead of hydro test we are doing 100% MT/PT for the bevel surfaces, root pass and final and 100% RTfor final joint. regards RE --- On Wed, 2/9/09, tong tong <ton...@gmail.com> wrote:

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[mohan q8]

Hi Tong,

 

You can not avoid the Tie-in joint in this case, RT is enough in lie of HT. sitll If u woried abt the integirity of the Tie-in joint u can increase the NDT tests usually ceint will ask for like 100% PT on Bevel edges, 100% Fitup inspection, PT after Root & hot passes, Final capping  and RT.

 

Regards,

 

Mohanq8.

[tong tong]

Dear Kural,

We use B31.3 as our construction code. This spool is additional to existing line. We made some modification on it.

[Shashank Vagal]

it is very common to do UT as an additional NDT... --- On Thu, 3/9/09, mohan q8 <moh...@gmail.com> wrote:

From: mohan q8 <moh...@gmail.com> Subject: [MW:3107] Re: Hydrotest for high pressure piping To: material...@googlegroups.com

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[tong tong]

Dear Nick Davies,

As i mentioned before, there are no isolation point. This line has 1 welded valve. We not sure whether this valve can withstand the test pressure and possiblity of valve leak. 

[Kural]

Tong

 

You have a provision in ASM B31.3  to a closure weld as per 345.2.3 C. 

Please ensure all the requirements of in process examination are carried out as per 344.7 

Regards

[I N. Suarjana]

Dear, Refers to some references, the effect of HT is notch nullification, how this effect will be covered by only NDE? Regards, I Nyoman S

--- On Thu, 9/3/09, tong tong <ton...@gmail.com> wrote:

From: tong tong <ton...@gmail.com> Subject: [MW:3111] Re: Hydrotest for high pressure piping To: material...@googlegroups.com

[Nick Davies]

Romove the valve for the pressure test, (it should have been pressure tested previously)

 

you can then use this valve access point to pressurize and record the pressure during testing,

 

regards,

 

Nick Davies

--
Regards,

Nick Davies