Plumbing Engineering Standards

ASME Standards

• ASME B16.1 - Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250
• ASME B16.5 - Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
• ASME B16.24 - Cast Copper Alloy Pipe Flanges and Flanged Fittings: Classes 150, 300, 600, 900, 1500, and 2500
• ASME B16.36 - Orifice Flanges
• ASME B16.42 - Ductile Iron Pipe Flanges and Flanged Fittings: Classes 150 and 300
• ASME B16.47 - Large Diameter Steel Flanges, NPS 26 Through NPS 60

ASTM Standards

• ASTM A105 / A105M - Specification for Carbon Steel Forgings for Piping Applications

AWWA Standards

• AWWA C115 - Standard for Flanged Ductile Iron Pipe with Ductile-Iron or Gray-Iron Threaded Flanges

ISO Standards

• ISO 5251 - Stainless steel butt-welding fittings

MSS Standards

• MSS SP-9 - Spot Facing for Bronze, Iron and Steel Flanges
• MSS SP-25 - Standard Marking Systems for Valves, Fittings, Flanges, and Unions
• MSS SP-44 - Steel Pipeline Flanges
• MSS SP-106 - Cast Copper Alloy Flanges and Flanged Fittings Class 125,150, and 300