- Vessel and piping fabrication requirements should be clearly specified in the mechanical design package. During fabrication, a quality assurance program should be in place to ensure that equipment is built according to design and meets all applicable codes and standards.
- The process safety management system should include mechanisms to assure that appropriately qualified craftsman are used. Since vessel and piping fabrication are frequently performed by vendors, management controls may have to extend into the vendor’s shop.
- The management system should also ensure that all vendors’ standards and work practices meet requirements. It is useful to have a set of standards for all vendors to follow. This presents organizational issues, both in designating responsibility for standards development and in managing the contractual relationship with vendors to enforce the standards. In addition, some level of auditing is a useful control mechanism.
- Documentation of tests and inspections performed during fabrication provides another control mechanism, and also generates important baseline data for comparison with future in-service tests and inspections conducted as part of a preventive maintenance program. For vessels built according to the ASME code, code certificated should be retained. As built drawings, along with all other documentation, materials of construction verification should be placed in an accessible equipment file. All documentation should be signed and dated by the person responsible for verifying the data.
- Reference: CCPS(1989) Guidelines for Technical Management of Chemical Process Safety