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General flange standards

All flanges are manufactured in accordance with industry-accepted standards.

ANSI
ASTM
DIN
AWWA
ASME

Flange - ASME B16.36, Orifice Flange (1/2"-24")

Slip-on Flange: Class 300, Class 400, Class 600, Class 900, Class 1500
Threaded Flange: Class 300, Class 400, Class 600, Class 900, Class 1500
Weld Neck Flange: Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500

Flange - Industry Standard Flange (also called Large Diameter Flange) (26"-larger)

Industry Standard Flanges have no national standard code or are they covered by any governing body.

Blind Flange: Class 75, Class 125, Class 175, Class 250, Class 350
Weld Neck Flange: Class 75, Class 125LW, Class 125, Class 175, Class 250, Class 350
Slip-on Flange: Class 75, Class 125LW, Class 125, Class 175, Class 250, Class 350
Flange - AWWA Standard Flange

AWWA C207

  • Steel Ring Flange: Class B, Class D, Class E, Class F
  • Steel Hub Flange: Class D, Class E
  • Blind Flange: Class B, Class D, Class E, Class F

AWWA C207

  • Steel Ring Flange: Class B, Class D, Class E, Class F
  • Steel Hub Flange: Class D, Class E
  • Blind Flange: Class B, Class D, Class E, Class F
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
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

ASME B16.5 and ASME B16.47 cover pipe flanges up to NPS 60 (B16.5 from 1/2" to 24" and B16.47 from 26" to 60"). ANSI B16.47 covers two series of flanges, Series A is equal to MSS SP-44-44, and Series B is equal to API 605 (API 605 has been canclled).

 

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