ASME ANSI B16 Standards for Pipes and Fittings
ASME ANSI B16 1 1998 Cast Iron Pipe Flanges and Flanged Fittings This Standard for Classes 25 125 250 Cast Iron Pipe Flanges and Flanged Fittings covers a pressure temperature ratings b sizes and method of designating openings of reducing fittings c marking d minimum requirements for materials e dimensions and tolerances