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Manufacturers provide pressure ratings for temperatures above
The full title of the standard is .
A test to verify the integrity of the valve seal, checking for permissible leakage rates across the seat at 1.1 times the rated working pressure. Why Is MSS SP-99 Compliance Important?
Adhering to MSS SP-99 is critical for maintaining system integrity in industrial automation and laboratory environments. It reduces the risk of leakage in high-pressure measurement systems and provides a basis for common practice between manufacturers and purchasers. MSS SP-99 - Manufacturers Standardization Society
You can purchase the official MSS SP-99 PDF directly from:
MSS SP-99 applies to steel and alloy valves characterized by the following parameters: Nominal Pipe Size ( NPS ) 2 and smaller.
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First published to address a gap in the industry, this standard provides the dimensional and material requirements for valves specifically used in instrumentation systems. While larger valves (like gate or ball valves) are covered by ASME or API standards, smaller instrument valves often fell into a gray area until MSS SP-99 was established.