ASME B16.5 - 2020 Pipe Flanges and Flanged Fittings

PIPE FLANGES AND FLANGED FITTINGS NPS 1 ⁄ 2 THROUGH NPS 24 METRIC/INCH STANDARD

ASME B16.5 covers pressure–temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings. Included are 

(1) flanges with rating class designations 150, 300, 400, 600, 900, and 1500 in sizes NPS 1 ∕ 2 through NPS 24 and flangeswith rating class designation 2500 in sizesNPS 1 ∕ 2 throughNPS 12,with requirements given inboth metric andU.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units 

(2) flanged fittings with rating class designation 150 and 300 in sizes NPS 1 ∕ 2 through NPS 24, with requirements given in both metric and U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units 

(3) flanged fittings with rating class designation 400, 600, 900, and 1500 in sizes NPS 1 ∕ 2 through NPS 24 and flanged fittings with rating class designation 2500 in sizes 1 ∕ 2 through NPS 1 2 that are acknowledged i n Nonmandatory Appendix E in which only U.S. Customary units are provided 

ASME B16.5 is limited to 

(1) flanges and flanged fittings made from cast or forged materials 

(2) 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, gaskets, and joints.