I'm working on a similar situation with NORSOK and what I've been told is that the actual material qualifications are witnessed by an individual who is representing the qualifying company (see the definitions in M650). The auditor may actually come in from Norway to do the audit. It is your customer who has the obligation to nominate you for qualification(everything proceeds up the food chain from that point)and be involved in arranging for audits or auditing. As far as qualification of NDE and Welding personnel and procedures is concerned, a European based Third Party Organization can perform that part of the work independent of NORSOK. Remember to look at the other NORSOK specifications relating to your part of the process, such as M630 R5 for materials requirements. Trying to co-ordinate the inter-relationships between NORSOK, EN specs, ISO 9000 and the PED isn't necessarily an easy task. Expect to spend a considerable amount of time and manpower on the program, getting it right isn't a snap of the fingers sort of thing. Hope this helps you