Flange Types
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Flange Types

Flange Types




Flat Face

Unconfined GasketFlat Face
  • Mating faces of both flanges are flat


  • Gasket may be ring type, or full face, which covers the entire face both inside and outside the bolts



Raised Face

Unconfined GasketRaised Face
  • Mating face is flat, but the area inside the bolt holes is raised 1/16" or 1/4"


  • Gasket is usually ring type, entirely within bolts


  • Flanges may be disassembled easily without springing the flange



Ring Joint

Also Called "API Joint"Ring Joint
  • Both flange faces have matching flat-bottomed grooves with sides tapered from the vertical at 23º


  • Gasket seats on flat section of flange between bore and ring joint groove


  • Garlock spiral wound gaskets can replace solid metal ring gaskets




Semi-Confined GasketMale-Female
  • Depth of female (recessed) face normally equal to or less than height of male (raised) face, to prevent metal-to-metal contact during gasket compression


  • Recessed O.D. normally is not more than 1/16" larger than the O.D. of the male face


  • Joint must be pried apart for disassembly



Tongue and Groove

Fully Confined GasketTongue and Groove
  • Groove depth is equal to or less than tongue height


  • Groove usually not over 1/16" wider than tongue


  • Gasket dimensions will match tongue dimensions


  • Joint must be pried apart for disassembly



Groove to Flat

Fully Confined GasketGroove to Flat
  • One flange face is flat, the other is recessed


  • For applications requiring accurate control of gasket compression


  • Only resilient gaskets are recommended —spiral wound, hollow metal O-ring, pressure-actuated, and metal-jacketed gaskets