Covers materials, dimensions, tolerances, and markings for metal ring-joint gaskets, spiral-wound metal gaskets, metal-jacketed gaskets, and filler material. These gaskets are dimensionally suitable for use with flanges described in reference flange standards: American National Standard for Pipe Flanges and Flanged Fittings NPS 1/2 Through NPS 24, ANSI/ASME B16.5-1996, American National Standard for Large Diameter Steel Flanges NPS 26 Through NPS 60, ANSI/ASME B16.47-1996, and American National Standard for Valves and Wellhead Equipment, ANSI/API Spec 6A-1989. This standard covers spiral-wound metal gaskets and metal-jacketed gaskets for use with raised-face and flat-face flanges.
ANSI/ASME B16.20a-2000 history
2000ANSI/ASME B16.20a-2000 Metallic Gaskets for Pipe Flanges; Ring-Joint, Spiral-Wound, and Jacketed