The ASME B16.5-2017 pipe flanges and flanged fittings standard covers pressure-temperature ratings,materials, dimensions,tolerances,marking,testing,and methods of designating openings for pipe flanges and flanged fittings.The flanges contain weld neck flange,blind flange,slip on flange,socket weld flange,lap joint flange,threaded flange.

ASME B16.5-2017 standard includes flanges with rating class designations 150,300,400,600,900,1500,and 2500 in sizes NPS ½ through NPS 24,with requirements given in both metric and U.S units.The standard is limited to flanges and flanged fittings made from cast or forged materials,and blind flanges and certain reducing flanges made from cast,forged,or plate materials.Also included in this standard are requirements and recommendations regarding flange bolting, flange gaskets,and flange joints.