| Specification | Process Description | Category | Limits |
| ACS-PRS-1151 | Welding of Tubular Joints | Welding | Limits: None |
| ACS-PRS-4504 | Assembly of Threaded and Welded Fittings. *NOTE* ASPL approval is not required for assembly of Class A Threaded Connections. Qualification and ASPL approval is required for Class B Welded Connections. | Miscellaneous | Limits: Limits: Class B Welded Tube Fittings, Not Approved for Appendix “A” |
| AWS D:17.1 | Fusion Welding for Aerospace Applications | Welding | Limits: Limits: Aluminum GTAW Only |