a. This standard covers the specifications for flanged steel safety relief values. Basic requirements are given for: 1. Orifice designation and area. 2. Value size and rating@ inlet and outlet. 3. Materials@ body and spring. 4. Pressure-temperature limits. 5. Centre-to-face dimensions@ inlet and outlet. b. For the convenience of the purchaser@ a sample specification sheet is given in Appendix A. c. Nameplate nomenclature and requirements for stamping are detailed in Appendix B.