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[MW:36151] Re: Guidance Required – PQR Base Material & Filler Metal

By Materials & Welding

Dear Sir,

Please advise on the PQR base material combination, filler metal selection, and PWHT requirement for 20 mm thickness, as per ASME B31.3, for the following joints:

  • API 5L X65 Pipe → A350 LF2 Flange
  • API 5L X65 Pipe → A860 WPHY 65 Elbow
  • A860 WPHY 65 Elbow → A350 LF2 Flange

All materials are understood as P-No. 1, Group No. 2 as per ASME Section IX. The service is ADNOC sour service / H₂S.

Kindly advise the suitable PQR base material combination, filler metal, PWHT requirement, and applicable Charpy / sour-service testing requirements





On Thu, 3 Sep 2026 at 10:00 PM ELAVARASAN SARANGAPANI <elavarasan1861994@gmail.com> wrote:

Dear Sir,

Please advise on the PQR base material combination and filler metal selection for the following joints:

● API 5L X65 Pipe → A350 LF2 Flange

● API 5L X65 Pipe → A860 WPHY 65 Elbow

● A860 WPHY 65 Elbow → A350 LF2 Flange


21 mm thickness 

All are understood as P-No. 1, Group No. 2 as per ASME Section IX. The service is ADNOC sour service / H₂S.

Kindly advise the suitable PQR base material combination, filler metal, and any required Charpy / sour-service testing. PWHT requirement 

Best Regards,
Elavarasan



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