Hi ENAYAT ZAREI,
Both of these standards covers seamless and welded fittings. Seamless fittings are more reliable than welded fittings ,simply due to the facts that it does not have any longitudinal seams.
For welded fittings not of joints are not specified by the specification
As a buyer one has the privilege of asking NDE of the longitudinal butt welds in a welded fittings.
What're the intended applications of these fittings, what pressure and temperature, are they meant for sour service?
My opinion would be should you intend to accept welded fitting, subject the joints to RT and then decide about acceptance.
Thanks,
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario,Canada.
Email-pgoswami@sympatico.ca,
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of ENAYAT ZAREI
Sent: Thursday, March 10, 2011 2:48 AM
To: materials-welding@googlegroups.com
Subject: [MW:10258] WELDED FITTINGS WITH TWO SEAM WELD
Dear all,
We ordered welded Carbon Steel & Stainless Steel fittings (45 & 90 degrees ELBOW, TEE, REDUCER … ) according to ASTM A234 and ASTM A403, but the manufacturer offered welded type with two seam for above 12” & 16” for Stainless Steel and Carbon Steel respectively.
According to ASTM A234, ASTM A403 and ASTM A960, I have not seen anything related to number of seam weld.
Now my questions are :
1-In which specification or Standard has been specified that welded fittings should be one seam or two seam weld?
2-Whether welded Fittings with two seam are acceptable or not ? if yes, under which condition?
Kind Regards,
--
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