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Friday 16 August 2013

Flange Facing Types

Flange Facing Types

One end of the flex joint is a flat face to match the pump face and the other end is raised face to match the flange.
  • Flat Face (FF) - Typically these flanges are used on pump facings or on fiberglass flanges where the torque of compressing the gasket will damage the flange body. They are found in 150# and 300# ratings. Their principal use is to make connections with 125# and 250# cast iron flanges, respectively.
  • Raised Face (RF) - The raised face is the most common used flange face. It is called raised face because the gasket is raised 1/16″ and 1/4″ above the bolt circle face: 1/16″ for 300 lb. and less, 1/4″ for 400 lb. and more. The flange facings are machine finished to ANSI/ASME B16.5 requirements.
  • Ring Type Joint (RTJ) (Class 300 and larger) – This flange is normally used for high pressure gas pipe work. Ring type gaskets must be used on this type of flange.
  • Tongue and Groove (T&G)
    • Small Tongue and Groove
    • Large Tongue and Groove
    • Small Male and Female
    • Large Male and Female