Your Question is very generic.
It depends on the Code, Specification, and Application.
For eg if the Code is ASME Sec.IX and the pipe is SA106Gr.B & the Flange is SA105, then P.No & Group No of pipe will be P1 & Gr.1 Whereas Flange will be P1 & Gr.2.
If you Qualify P1 Gr.1 to P1 Gr2, then it qualifies P1Gr1 to P1Gr1 and P1Gr2 to P1Gr2 & P1Gr1 to P1Gr2.
See below snap shot from ASME Sec.iX
Thanks & Regards
J.Gerald Jayakumar
On Wednesday, 6 December, 2023 at 11:08:22 am IST, Muhammed Shareef <shareefpyari@gmail.com> wrote:
Dear experts,
-- Is it mandatory to qualify PQR with pipe and flange.? Why can't we qualify with pipe only. What is the limitations here to do so.
Thanks
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