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Dear "LittleInch" , I offered my recommendation to use WNF, ASTM A707 instead of A105.

Thank you so much "LittleInch" Dear "DekDee" you are right the test pressure is based on design pressure, but we have to ensure that hoop stress will be produced from test pressure doesn't exceed 100% of SMYS at any point. Thank you for all sharing info.

Gents, we had already welding neck flange and a pipe with the same wall thickness but different yield strength as per above specs.

you are right the Min. SMYS of a105N is 36 KSA this is the min. required , but regarding to supplier certificate and after heat treatmeant it became 52 KSI , doesn't matter! I think there is no problem to weld the pipe and flange together taking in consideration the difference between two yield...

Thanks for your kind response "LittleInch" , be noted the pipe has the same thickness of WNF (0.81")but they have different yield strength and as per material specs. certificate from supplier of WNF its yield strength is 363 MPa (~ 52 KSI) but the yield strength for pipe is 70 KSI , so the hub...

If we intend to use weld neck flange 56" , 600# , THK. 0.81" (ASTM A105N) with pipe 56" , API 5L , X70 , THK. 0.81" , is it applicable to weld them together and what is the precautions shall be taken in our considerations for this issue including welding , NDT and hydro static testing? Note...

internal coating for golden weld joint

thanks Pennpiper [smile] I meant, Is there a solution for internal coating of golden weld or I try to get another way to hydrotest the branches with main pipeline to overcome the problem of internal coating of golden weld .

Dears, Is it possible to create "golden weld" for internal coating pipeline after hydrostatic testing, and what's the technique used for coating "golden weld" ? note: we have main pipeline 20" and two branches 12" , where each pipeline will be hydrostatic tested separately and then two...