General Fitting Standards

Written by Matt Milbury. Posted in Pipe Fittings

Some of the standards that apply to buttwelded fittings are listed below.  Many organizations such as ASME, ASTM, ISO, MSS, etc. have very well developed standards and specifications for buttwelded fittings.  It is always up to the designer to ensure that they are following the applicable standard and company specification, if available, during the design process.

Standards

ASME Standards

  • ASME B16.1 - Cast Iron Pipe Flanges and Flanged Fittings
  • ASME B16.3 - Malleable Iron Threaded Fittings
  • ASME B16.4 - Gray Iron Threaded Fittings
  • ASME B16.9 - Factory-Made Wrought Buttwelding Fittings
  • ASME B16.11 - Forged Fittings, Socket-Welding and Threaded
  • ASME B16.14 - Ferrous Pipe Plugs, Bushings, and Lock nuts With Pipe Threads
  • ASME B16.15 - Cast Bronze Threaded Fittings, Class125 and 250
  • ASME B16.18 - Cast Copper Alloy Solder Joint Pressure Fittings
  • ASME B16.22 - Wrought Copper and Copper Alloy Solder Joint Pressure Fittings
  • ASME B16.24 - Cast Copper Alloy Pipe Flanges and Flanged Fittings: Classes 150, 300, 600, 900, 1500, and 2500
  • ASME B16.25 - Buttwelding Ends
  • ASME B16.26 - Cast Copper Alloy Fittings for Flared Copper Tubes
  • ASME B16.39 - MalleableIron Threaded Pipe Unions, Class 150, 250, and 300
  • ASME B16.42 - Ductile Iron Pipe Flanges and Flanged Fittings: Classes 150 and 300

ASTM Standards

  • ASTM A105 / A105M - Specification for Carbon Steel Forgings for Piping Applications
  • ASTM A234 / A234M - Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
  • ASTM A403 / A403M - Specification for Wrought Austenitic Stainless Steel Piping Fittings
  • ASTM A420 / A420M - Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service

AWWA Standards

  • AWWA C110 - Ductile-Iron and Gray-Iron Fittings, 3 Inch Through 48 Inch (75 mm Through 1200 mm), for Water and Other Liquids
  • AWWA C208 - Dimensions for Fabricated Steel Water Pipe Fittings

ISO Standards

  • ISO 5251 - Stainless steel butt-welding fittings
  • ISO 5256 - Steel pipes and fittings for buried or submerged pipe lines -- External and internal coating by bitumen or coal tar derived materials

MSS Standards

  • MSS SP-43 - Wrought Stainless Steel Butt-Welding Fittings Including Reference to Other Corrosion Resistant Materials
  • MSS SP-75 - Specifications for High Test Wrought Buttwelding Fittings
  • MSS SP-73 - Brazing Joints for Copper and Copper Alloy Pressure Fittings
  • MSS SP-83 - Class 3000 Steel Pipe Unions, Socket-Welding and Threaded
  • MSS SP-97 - Integrally Reinforced Forged Branch Outlet Fittings — Socket Welding, Threaded, and Buttwelding Ends
  • MSS SP-106 - Cast Copper Alloy Flanges and Flanged Fittings Class 125,150, and 300
  • MSS SP-119 - Factory-Made Wrought Belled End Socket Welding Fittings

SAE Standards

  • SAE J514 - HydraulicTubeFittings