Pressure Vessel materials shall be as specified on the Vessel Data Sheet.
All attachments to vessels shall be of the same ‘P Number' material as that for the pressure envelope, unless approved otherwise by WorleyParsons.
Major repairs to correct material defects shall require prior Mechanical Engineering approval. Major repairs shall be as determined by the applicable Code Section or the Inspector.
The Vendor shall also select materials suitable for the service conditions as specified on the Vessel Data Sheet. Material selection shall be subject to review and approval.