A rating basis for class 150 flanges was developed in the ansi b16. It covers forged steel flanges, sizes nps 12 dn 15 through nps 24. Class 150 forged steel raised face blind flanges per ansi b16. The next edition of this standard is scheduled for publication in 2015. To order a reducing flange, state the smaller size first, then the. Operator flange conforms designed to work with manual, pneumatic. Nps 12 through nps 24 metricinch standard covers pressuretemperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings. Each forging is marked with manufacturers name, heat number or heat identification, designation of. Requests for interpretations or suggestions for revisions should be sent to the secretary, b16 standards committee, two park avenue, new york, ny 100165990. Weld neck, slipon, socket weld, threaded, lap joint, blind. Weights are based on manufacturers data and are approximate. Reducing flanges are available in all types and pressures. Flat face flanges may be provided at full thickness, c, or with raised face removed the latter is nonstandard.
The manufacturers name or trademark materials are listedin table 1b. Pipe flanges and flanged fittings abangah sanaat baran. Pdf asme b16 5 20 pipe flanges and flanged fittings. Asme issues written replies to inquiries concerning interpretations of technical aspects of this. Following approval of the standards committee and asme, approval for the new edition was granted by the american national standards institute on february 5, 20.