Power 2024 Asme B16.5. Asme standards & certification is preparing to issue revised versions of three of its asme b16 standards, which have been defining and ensuring piping safety. The asme b16.5 standard provides the 7 pressure classes for flanges.

The current ansi / asme flange specifications of b16.5 and b16.47 trace their roots to the old b16.1 specification from decades past, which consisted primarily of cast iron. 1/2 through nps 24 metric/inch in pressure.