A machined metallic ring with a deep groove bored into its face is a Ring-type joint flange. When the connecting bolts of the flange are tightened, a metal ring is crushed within the groove. This pressure creates a tight-fitting, leak-proof seal on the pipe or connector.

A carbon steel ring type joint flange is spill-proof, whereas a stainless steel ring type joint flange is typically used in high-pressure and high-temperature services. They are made from different materials, such as steel, aluminum, and copper.

The Ring Type Joint Flanges are the type of flange that has a more prevalent flange connection choice. Compared to Raised face, ring-type joint flanges are the better option. Suitable for high-pressure and high-temperature applications, Ring Type Joints Flanges are commonly used. Despite being only an option on ANSI/ASME class flanges, API flanges are generally required to have standard surface sealing since API flanges typically run at a greater pressure than ANSI/ASME flanges.

During the mating of one flange to another, a ring-type joint gasket seals when the bolt and hardware are used to close them. Gaskets are often made from a softer material than the flanges to which they are attached. This material is most commonly used. Slow and consistent pressure on the ring joint surfaces will “crush” the gasket. This will prevent any leaks from arising during flange assembly.

Joint gaskets are referred to by their “R” number. They are available in oval or octagonal shapes. The smooth surface of ring joint sides makes both types nearly interchangeable.

The Ring Type Joint Flanges are best suited for high-pressure, high-temperature applications where ring joint facings are usually used.