[MW:6390] Qualification of pipe

1) I have qualified for welding pipe 2" (60.3mm OD) material P-No.1 to P-No.1.

Do I qualified for welding
a) pipe 6" (168.3mm OD)
b) material P-No.8 to P-No.8
c) pipe P-No.10H to P-No.10H with 2" (OD).

2) If we welding pipe, the qualification base on OD pipe or thickness pipe?

Thanks.