ASME 16.9 covers overall dimensions, tolerances, ratings, testing, and markings. For factory-made wrought butt-welding fittings in sizes NPS 1⁄2 through NPS 24 (DN 15 through DN 600). HPFVN supplies ASME B16.9 buttweld fittings in a comprehensive range of materials, covering carbon (WPB, P235GH, P265GH ….) alloy (WPL6, WP11, WP5 ….) steel pipe fitings. These fittings include elbows, tees, caps and reducers.