Emergency Shutdown Systems (ESD) utilizing high-pressure hydraulic fluid to actuate large pipeline valves.
, officially titled Instrument Valves , is a standard practice developed and maintained by the Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry. An MSS Standard Practice serves as the industry’s benchmark—a "basis for common practice by the manufacturer, the user, and the general public". The standard applies to small valves and manifold valves developed for and predominantly used in instrument, control, and sampling piping systems, covering steel and alloy valves of nominal pipe size (NPS) 2 and smaller , with pressure ratings of 15,000 psi and lower at 100 °F . The standard is maintained under the consensus of MSS Technical Committee 115, Instrument Valves .
Applies to valves with a Nominal Pipe Size ( NPS ) of 2 and smaller .
A standard is only as good as the tests it prescribes. MSS SP-99 defines requirements through two main categories of tests: Qualification Tests and Acceptance Tests.
Mss Sp99 Pdf Jun 2026
Emergency Shutdown Systems (ESD) utilizing high-pressure hydraulic fluid to actuate large pipeline valves.
, officially titled Instrument Valves , is a standard practice developed and maintained by the Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry. An MSS Standard Practice serves as the industry’s benchmark—a "basis for common practice by the manufacturer, the user, and the general public". The standard applies to small valves and manifold valves developed for and predominantly used in instrument, control, and sampling piping systems, covering steel and alloy valves of nominal pipe size (NPS) 2 and smaller , with pressure ratings of 15,000 psi and lower at 100 °F . The standard is maintained under the consensus of MSS Technical Committee 115, Instrument Valves . mss sp99 pdf
Applies to valves with a Nominal Pipe Size ( NPS ) of 2 and smaller . The standard applies to small valves and manifold
A standard is only as good as the tests it prescribes. MSS SP-99 defines requirements through two main categories of tests: Qualification Tests and Acceptance Tests. A standard is only as good as the tests it prescribes
