This Standard 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) marking (d) materials, (e) dimensions and tolerances, (f) bolting and gaskets, (g) pressure testing
ASME B16.1-2010 history
2020ASME B16.1-2020 Gray Iron Pipe Flanges and Flanged Fittings Classes 25, 125, and 250
2015ASME B16.1-2015 Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250
2010ASME B16.1-2010 Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250 (B16.1 - 2010)
2005ASME B16.1-2005 Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250
1998ASME B16.1-1998 Cast iron pipe flanges and flanged fittings - Classes 25, 125, and 250
1989ASME B16.1-1989 Cast iron pipe flanges and flanged fittings