2-way, 3-way, and 5-way manifold blocks used to isolate, bleed, and calibrate differential pressure instruments.
Standardized seat leakage and shell tests that every production valve must pass.
Tapered threads requiring appropriate thread sealants.
MSS SP-99 defines how a valve's maximum allowable working pressure decreases as the operating temperature rises. These ratings depend heavily on the sealing materials used (e.g., PTFE, PEEK, or Graphite). Testing Procedures mss sp99 pdf
Every valve manufactured to this standard must undergo rigorous pressure testing:
Below is a comprehensive guide to the MSS SP-99 standard, its technical requirements, and why acquiring the PDF version is critical for industrial compliance. What is the MSS SP-99 Standard?
a standard practice for Instrument Valves published by the Manufacturers Standardization Society (MSS) 2-way, 3-way, and 5-way manifold blocks used to
MSS SP-99, published by the Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry, specifically covers (such as needle valves, gauge valves, and manifold valves). These are the small but vital components that connect pressure gauges, transmitters, and switches to process lines.
For instrument manifold assemblies, also refer to (Part-Turn Valve Actuators) if automated.
: Covers valves rated up to 15,000 psi at 100°F (38°C). MSS SP-99 defines how a valve's maximum allowable
Do you need to compare MSS SP-99 with or API 607 ?
: Covers steel and alloy valves with a Nominal Pipe Size (NPS) 2 and smaller .
It specifically establishes requirements for small valves—typically 2 inches and smaller—used in instrument, control, and sampling lines. These valves are vital components in oil and gas refineries, chemical processing plants, power generation facilities, and manufacturing industries.
. It focuses on the design, materials, and testing of small valves (NPS 2 and smaller) typically used in control, sampling, and instrument piping systems. Manufacturers Standardization Society Key Components of the Standard According to the latest MSS SP-99-2023