ASME B16.9 Standard covers overall dimensions, tolerances,ratings, testing, and markings for factory-made wrought buttwelding fittings in sizes NPS 1⁄2 through NPS 48 (DN 15 through DN 1200). ASME B16.9 Pipe elbows Interanational mark for delivery Measuring the out diameter Factory-Made Wrought Buttwelding Fittings ASME-American Society of Mechanical Engineers SCOPE 1.1 General This Standard covers overall dimensions, tolerances,ratings, testing, and markings for factory-made wrought buttwelding fittings in sizes NPS 1⁄2 through NPS 48 (DN 15 through DN 1200). 1.2 Special Fittings Fittings may be made to special dimensions, sizes,shapes, and tolerances by agreement between the manufacturer and the purchaser. 1.3 Fabricated Fittings Fabricated laterals and other fittings employing circumferential or intersection welds are considered pipe fabrication and are not within the scope of this Standard. Fabricated lap joint stub ends are exempt from the above restrictions, provided th...