The purpose of MSS SP-137 (Quality Standard for Positive Material Identification of Metal Valves, Flanges, Fittings, and Other Piping Components) is to establish standardized methods and acceptance criteria for verifying the chemical composition of metallic piping components.
The standard is critical for preventing material misidentification, which is a leading cause of catastrophic failures, corrosion, or equipment damage in industrial environments.
Typical Usage
This standard is typically used as a quality assurance and control requirement in industries where piping system reliability is paramount, such as oil and gas, chemical processing, power generation, and nuclear facilities. It is applied to ensure that the actual metal alloy used matches the material specified in the engineering design documents, especially for components in high-pressure, high-temperature, or corrosive fluid services.
Key uses include:
Note that the PMI test governed by MSS SP-137 is for material grade identification only and does not replace a detailed chemical analysis report.
| SDO | MSS: Manufacturers Standardization Society |
| Document Number | SP-137 |
| Publication Date | Oct. 1, 2025 |
| Language | en - English |
| Page Count | 18 |
| Revision Level | |
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