This standard was issued by the State Administration for Market Regulation and the National Standardization Administration on October 31, 2025, and came into effect on May 1, 2026. HuaHai Sealing is one of the drafting units.
This document describes test methods for the sealing performance of gaskets for pipe flanges at specified temperatures, including the leakage cavity pressurization method (Method A), the pressure decay method (Method B), and the helium mass spectrometer vacuum leak detection method (Method C).
This document applies to the determination of the sealing performance of circular gaskets for pipe flanges under test temperatures not exceeding 900 °C and medium pressures not exceeding 10 MPa. The gasket types covered include non-metallic flat gaskets, spiral-wound gaskets, PTFE-coated gaskets, metal-jacketed gaskets, flexible graphite composite reinforced gaskets, metal serrated combination gaskets, and metal corrugated-toothed composite gaskets; other types of gaskets may be referenced for implementation.