ASME B16.42 pdf download Ductile Iron Pipe Flanges and Flanged Fittings Classes 150 and 300 3.2 Ratings of Flanged Joints Ratings in this Standard apply to flanged joints that conform to the limitations on bolting in para. 6.2 and on gaskets in para. 7.8, and which are made up in accor- dance with good practice for alignment and assembly. See...