How dare OSHA even mention “torque” as part of a PSM QA program…
A quality assurance system is needed to help ensure that the proper materials of construction are used, that fabrication and inspection procedures are proper, and that installation procedures recognize field installation concerns. The quality assurance program is an essential part of the mechanical integrity program. It will help maintain the primary and secondary lines of defense designed into the process to prevent unwanted chemical releases or those that control or mitigate a release. “As-built” drawings, together with certifications of coded vessels and other equipment, and materials of construction, need to be verified and retained in the quality assurance documentation.
Equipment installation jobs need to be properly inspected in the field for the use of proper materials and procedures, and to ensure that qualified craftsmen are used to do the job. The use of appropriate gaskets, packing, bolts, valves, lubricants, and welding rods needs to be verified in the field. Also, procedures for installing safety devices need to be verified, such as the torque on the bolts on ruptured disc installations, uniform torque on flange bolts, proper installation of pump seals, etc. If the quality of parts is a problem, it may be appropriate to conduct audits of the equipment supplier’s facilities to ensure better, proper purchases of required equipment, which is suitable for its intended service. Any changes in equipment that may become necessary will need to go through the management of change procedures.
Source: https://www.osha.gov/laws-regs/federalregister/1992-02-24