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Re: [MW:33807] Duplex, super duplex stainless steel repair

By Materials & Welding
Hi Mr. Ragu

The material grade is S32750.
And we found leakage in service, 

We will have random RT 90% are rejected and moreover PMI confirm the material in duplex not super duplex. 

after the root cause analysis we found corrosion on weld. Not in pipe and fittings.

The WPS used in production having more heat input compare then root pass. 






On Thu, Dec 8, 2022, 10:59 AM Raghuram Bathula <raghurambathula@gmail.com> wrote:
Dear Ganesh
what grade?, what type of failures (in NDE or in service?), any root cause analysis done.
Knowing the root cause and extent of damage is very important before attending repairs.

if you are considering these are as closure joints, then only Volumetric examination is permitted, otherwise check feasibility for in service testing

On Thu, 8 Dec 2022 at 13:22, Ganesh Muthurajan <qceng.mg@gmail.com> wrote:
Good morning sir, 

Now i working with duplex and super duplex , RO plant.

How to do the repairs in this material, for example we found two segment in 10 mm  in 14 inch pipe. 

Can we do partial repair, or fully cutout and reweld.  Any code reference advice to do full cutout, or partial.

Second case this plant was handed over to the Clint, during commissioning we found leakage, not only the butt joint, even in the branch connection, 

Aramco advise to do 100 %rt butt joint and branch.

Branch we can't do RT, placing a film is deficult.  What to do in this. 

Please advise me your experience and international, Aramco code reference.


Thank you

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