Repair job with R stamp, Hyderotest & derating query

[abuanaselmasry]

I totally agree with you that it is legal problem more than engineering. Even, there is no design problem at all.

I will till what we finally decided and please till is this OK or Not.

first of all the vessel is not installed in neither USA or Canda and there is not local jurisdiction which role the installation and repair of pressure vessels.
We convinced the client (Aramco by the way) that we will consider this job as two separate jobs. One for Repair and another for de-rating.
Repair job was 100% as per NBIC code and R stamp is applied.
De-rating job is as per API 510 and there is no involvement of NBIC.

Summary;
The vessel stamp is still valid since we are operating the vessel not beyond the limit of the vessel rating. After repair the vessel still can work at the original pressure temperature rating. However, the User decided to operate it at lower values. Original ASME Nameplate still shows the original rating. another nameplate (not stamped) will be attached near to ASME nameplate.

[Wagolin]

I agree....but above all, the most important thing is that your client is finally convinced with your solution and the problem is solved....everything else becomes an anecdote...

I´ve been involved in long, difficult debates about the aplicability of codes and standards exactly the way you described between parties and in my experience the best solution is to sign a very specific contract in which the extent of the job is clearly established, putting in writing the code or standard that covers the job and sticking to it...if you get a client to approve that, half the job is done...

glad you solved it...

regards...