Flanges are mainly used to connect valves, pumps and pipes to make a complete piping system. Flanges are classified into three types based on faces, Raised Face (RF), Flat Face (FF) and Ring-Type Joint Face (RTJ). The most commonly used type is Raised Face flange. Flanges can be connected to the piping system either welded or screwed. Flanged joints are fixed by bolting together, with a gasket in between where as required.
- ASTM A105, Carbon Steel