ASME B16.1: 2020 [paper]

Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250

Covers Classes 25, 125, and 250 Gray Iron Pipe Flanges and Flanged Fittings. It includes: (a) pressure-temperature ratings; (b) sizes and method of designating openings of reducing fittings; (c) markings; (d) materials; (e) dimensions and tolerances; (f) bolting and gaskets; (g) pressure testing.

ASME B16.1, 9780791873724