Re: [MW:20420] RE: 20411] DSS vs SDSS welding.

Dear Mr. Mohammed:

ASME Sec IX is not the only criteria. It only deals with weld-ability and minimum mechanical properties and it has nothing to do with corrosion resistance.That's why we use NACE as an additional requirement for such applications.

And for seawater application, SDSS and DSS are definitely different...!!!

There is no problem with weld-ability (or even mechanical properties) but corrosion resistance will drop. The weld metal will not be 2705 anymore and it means that corrosion characteristics will be different which may result in failure during corrosion tests (ASTM G48, ASTM A923 etc.). So I would forget about the idea of using 2205 for welding 2705 and making things complicated. "Keeping things as simple as possible" always works.

Best Regards

Ramin Kondori

Sr. QA/QC engineer

Yadavaran Oilfield Project

SIPC (SINOPEC)

On Wed, Mar 26, 2014 at 9:46 PM, S.Mohammed <mohd52100@gmail.com> wrote:

dear sir,
i agree with weld.metal chemistry.

service is seawater line highly corrosive.

But as per ASME,there is same A number 8 is provided for both DSS n SDSS. And P.number also 10H and group also same 1.

its looks like a limitation of ASME or it is more libaral about metal classfication.

in what code or standard basis should i say to my construction for new WPS.

regards,

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