@ansi150pressureclasses
ANSI B16.5 is a standard published by the American Society of Mechanical Engineers (ASME), officially known as “Pipe Flanges and Flanged Fittings.” It is applicable to pipe flanges and flanged fittings made from cast or forged materials. This standard covers the assessment and specifications of pipe flanges and flanged fittings characteristics for NPS 1/2 to NPS 24, represented in both metric and U.S. customary units: Pressure-temperature ratings, Materials, Dimensions, Tolerances, Marking, Testing, Methods of designating openings.