Raised Face (RF)
These flanges have an inner bore circle gasket and a tiny elevated portion around the bore. There are raised face flanges for various pressure and temperature ratings. Also, the most prevalent form of flange used in the oil and gas and chemical engineering sectors is RF flanges.
Male and Female Face (M&F)
To hold the gasket in place, these flanges have elevated parts and matching grooves. However, gasket retention happens on the female face, offering more precise positioning and a wider range of materials.
Tongue and Groove (T&G)
The grooves and raised areas on these flanges mirror those on the male and female face flanges. This facilitates installation because the design encourages self-alignment of the flanges and creates a reservoir for gasket glue.
Flat Face
As their name implies, flat face flanges have an even, flat surface. They also have a full-face gasket covering most of the flange surface.
Ring Joint Face (RTJ)
This face type, used in high-pressure and temperature applications, has a notch in which a metal gasket is placed to maintain the seal.
