ASME B16.24-2011

pipe flanges and blind pipe flanges having rating class designations 150, 300, 600, 900, 1500, and 2500. This Standard also covers flanged fittings having rating class designations 150 and 300. It establishes requirements for
(a) pressure?temperature ratings
(b) size and method of designating openings for reduced fittings
(c) markings
(d) materials
(e) dimensions
(f) bolting and gaskets
(g) tolerances
(h) tests
This Standard also provides dimensional requirements for flanged ends of valves conforming to MSS SP-80.