Functions, Design, and consideration of Flanges
MAKING THE CONNECTION: FLANGE FACING TYPES Flange design is only the start when considering the ideal flange for your piping system. Face types are another characteristic that will have a major impact on the final performance & service life of your flanges . Facing types determine both the gaskets needed to install the flange & characteristics related to the seal created. Common face types include: · Flat Face (FF) : As the name suggests, flat face flanges feature a flat, even surface combined with a full face gasket that contacts most of the flange surface. · Raised Face (RF) : These flanges feature a small raised section around the bore with an inside bore circle gasket. · Ring Joint Face (RTJ) : Used in high-pressure & high-temperature processes, this face type features a groove in which a metal gasket sits to maintain the seal. · Tongue & Groove (T&G) : These flanges feature matching grooves & raised section