Typical flange facingsFlange / Face Finish in accordance with ASME B16.5

1, Typical flange facings

 

 1) Flat Face (FF): Sealing is also by compression of a flat non-metallic gasket (very rarely

 a flat metallic gasket), the phonographic/ concentric grooved surfaces of the mating

FF flanges.

 2) Raised Face (RF): Sealing on a RF flange is by a flat non-metallic gasket (or a

 flat  metallic gasket for special applications), which fits within the bolts of the flange.

 3) Ring Type Joint (RTJ) - Typically found on the most severe duties, for example

 high pressure gas pipework.

 

 2. Flange Face Finish in accordance with ASME B16.5

 

3. Flange Type