Duplex Casting with unassigned P-number
Duplex Casting with unassigned P-number
(OP)
Hi,
We're using a PQR qualified with seamless pipe in duplex (S31803) : P10h-P10H. Our customer doesn't agree that we use this PQR to weld a pipe of duplex to a casting of the same grade (ASTM A890 gr 4A). The reason is that duplex casting has no P-number, so it should be separately qualified according asme IX.
If we follow strictely the code it is right. But, duplex casting has the same composition to forge or pipe duplex. Is there really a technical justification to have not assigne a P-number to duplex casting or is it just because AMSE is not an exhaustiv list and some judgment need to be taken.
thanks
Erick21
We're using a PQR qualified with seamless pipe in duplex (S31803) : P10h-P10H. Our customer doesn't agree that we use this PQR to weld a pipe of duplex to a casting of the same grade (ASTM A890 gr 4A). The reason is that duplex casting has no P-number, so it should be separately qualified according asme IX.
If we follow strictely the code it is right. But, duplex casting has the same composition to forge or pipe duplex. Is there really a technical justification to have not assigne a P-number to duplex casting or is it just because AMSE is not an exhaustiv list and some judgment need to be taken.
thanks
Erick21





RE: Duplex Casting with unassigned P-number
RE: Duplex Casting with unassigned P-number
I agree with your statement, but is there a specific technical reason to have the duplex casting gr 4A unassigned whereas : pipe, fitting and forge are all P10H?
RE: Duplex Casting with unassigned P-number
RE: Duplex Casting with unassigned P-number
RE: Duplex Casting with unassigned P-number
RE: Duplex Casting with unassigned P-number
RE: Duplex Casting with unassigned P-number
RE: Duplex Casting with unassigned P-number
I agree as well, Castings can be tricky beasts to overcome at times. Take for example CA6NM; this material has a mind of it's own! Only due to experience and many, many, trials and errors; I do now as a Company's Senior Welding Engineer actually qualify castings as their own entity due to the issues that can arise. Casting specifications are definately not friendly to Welding Procedures, nor is any casting exactly the same as the next.