Re: [MW:33808] Duplex, super duplex stainless steel repair

Hi S32750 is a super duplex grade. Repair welding is always more tricky than original welding. Irrespective of the issues, as 90% of the weld contains defects causing rejection, it would be advisable to remove the previous weld by machining and reweld with matching filler. As the base metal is S32750 (according to description) ER-2594 filler should be used. Welding heat input & welding parameters control should be exactly same as the Procedure Qualification.

DSS/SDSS are always used in extremely corrosive environments, hence due control of welding parameters and following the rules of fabricating DSS/SDSS would be advisable.

Aramco has extensive guidelines on welding DSS/SDSS. You may follow those or ask for that information as needed.

RT is difficult to perform on branch welds.However may be possible for larger dia welds.

Thanks. 

P.Goswami, P.Eng, IWE.

On Friday, December 9, 2022 at 10:14:01 a.m. IST, Ganesh Muthurajan <qceng.mg@gmail.com> wrote:

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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