General Pipe Flange Standards

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  • 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

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Tags: Pipe Flange Standards