I think you should provide more data so people can be of better help.
Anyway, mixing up codes, which is what I understand from your post, is not a good thing.
a) What is your design code?
That code will dictate the testing requirements. In general, leak testing (i.e. hydrotest) is mandatory. Charpy testing only when your design code tells you to. Charpy can be done on weld material, base material or both. And it can also be a welding procedure requirement.
b) Does CE marking apply? I.e. PED 97/23/EC
Answer both a and b and we may be of help.