Standard Connection Flange

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This flange is normally used for nozzles on pressure vessels and rarely used with pipe.  The hub of the flange is straight and thicker than the taper of the weld neck flange (WNF). This flange has a raised face.


  • FBF - full barrel flange
  • HBF - heavy barrel flange
  • LWNF - long weld neck flange

Standard Connection Flange Index


flange standard connection 1Long Weld Neck Flangeflange standard connection 2Heavy Barrel Flangeflange standard connection 3Full Barrel Flange










Standard Connection Flange Standards

  • ASME Standards
    • ASME B16.5 - Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard


Standard Connection Flange Datasheets

ClassRaised FaceRaised FaceRaised Face
ANSI 150 LWN, ANSI Class 150, B16.5 (in) HBF, ANSI Class 150, B16.5 (in) FBF, ANSI Class 150, B16.5 (in)
ANSI 300 LWN, ANSI Class 300, B16.5 (in)    
ANSI 400 LWN, ANSI Class 400, B16.5 (in)    
ANSI 600 LWN, ANSI Class 600, B16.5 (in)    
ANSI 900 LWN, ANSI Class 900, B16.5 (in)    
ANSI 1500 LWN, ANSI Class 1500, B16.5 (in)    
ANSI 2500 LWN, ANSI Class 2500, B16.5 (in)    


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Tags: Pipe Flange