From P1 to P8

[Alex555]

Hello!
2 questions about Asme 9:
1. Can a welder who is certified to weld P1 weld P8?
I saw that QW423.1 says yes, but that doesn't make sense.
2. Can a plate welding certification also be a pipe certification?
In short - can a welder for CS plate weld SS pipe?
Thanks,

 

[IdanPV]

1. A change in P-Number is an Essential Variable for WPQ and WPS see QW-250 & QW-350.
2. Depends on welding position and pipe O.D, see QW-461.9.