Covers pressure - temperature ratings, materials, dimensions, tolerances, marking, testing, and method of designating openings for pipe flanges and flanged fittings.
ANSI/ASME B16.5-2003 history
2013ANSI/ASME B16.5-2013 Pipe Flanges and Flanged Fittings NPS 1/2 Through NPS 24 Metric/Inch Standard
2003ANSI/ASME B16.5-2003 Pipe Flanges and Flanged Fittings NPS 1/2 Through NPS 24