In piping systems, the three main types of flange gaskets are the full face, the ring joint, and the:

The correct answer identifies the third main type of flange gasket used in piping systems as the flat ring type. This type of gasket is specifically designed to provide a tight seal between flanges, minimizing the risk of leaks. Flat ring gaskets are flat and typically made from materials like rubber, PTFE, or metal, making them versatile for different applications including high-pressure and high-temperature environments.

In piping applications, the flange gaskets serve the critical role of preventing fluid leaks by creating a barrier between the two flanges being joined. Each type of gasket has specific applications and advantages depending on the working conditions.

Full face gaskets, for instance, cover the entire face of the flange, ensuring a good seal even under irregularities in flange surfaces. Ring joint gaskets, on the other hand, are particularly effective in high-pressure situations due to their metal construction and design, which allows them to fill gaps well.

The flat ring type combines simplicity and effectiveness, contributing to the integrity of the connection without requiring complex installation procedures. Its prevalence in various industries reflects its reliability and the balance it provides between performance and ease of use.