If you are searching for a PDF of MSS SP-99, here is what you will find once you obtain the official version:
To establish a pressure rating, manufacturers must perform hydrostatic proof and burst tests . The Cold Working Pressure (CWP) rating is determined based on the recorded burst pressure results. mss sp-99 pdf
Standardized factory tests (like seat and shell pressure tests) before a valve is shipped. If you are searching for a PDF of