The ring type joint was initially developed for use in the petroleum industry, where high pressure/temperature applicationsnecessitated the need for a high integrity seal. They are mainly used in the oil field on drilling and completion equipment. Ring type joints are also commonly used on Valves and pipework assemblies, along with some high integrity pressure vessel joints.
Most applied type is style R ring that is machined to tight manufacturing tolerances in accordance with the relevant standards, to ensure correct installation in standard API 6B and ASME B16.5 Ring Type Flanges.
Oval and Octagonal RTJ's with the same ring size designation can be interchangeable in standard flanges with flat bottomed ring grooves. For the old style round bottomed grooves Oval RTJ's only can be used. Materials of construction are selected to match the flange material and to be resistant to the corrosive and erosive media. In addition, the material hardness of the RTJ's is less than the hardness of the flanges to ensure the RTJ is deformed and not the flanges when assembled. Non-standard size RTJ's are specifically designed to be installed in flanges designed around a specific application rather than a standard flange.
Most applied type is style R ring that is machined to tight manufacturing tolerances in accordance with the relevant standards, to ensure correct installation in standard API 6B and ASME B16.5 Ring Type Flanges.
Oval and Octagonal RTJ's with the same ring size designation can be interchangeable in standard flanges with flat bottomed ring grooves. For the old style round bottomed grooves Oval RTJ's only can be used. Materials of construction are selected to match the flange material and to be resistant to the corrosive and erosive media. In addition, the material hardness of the RTJ's is less than the hardness of the flanges to ensure the RTJ is deformed and not the flanges when assembled. Non-standard size RTJ's are specifically designed to be installed in flanges designed around a specific application rather than a standard flange.
Typical Application
Oval and Octagonal RTJ's are designed to seal pressures of up to 6,250 psi in accordance with ASME B16.20 and up to 5,000 psi in accordance with API 6A pressure ratings.
Typical high pressure and temperature applications where these gaskets are used include Valve and pipe-work assemblies in oil field drilling and refining applications. In addition, these gaskets are installed in high pressure vessels and pumps.
Typical high pressure and temperature applications where these gaskets are used include Valve and pipe-work assemblies in oil field drilling and refining applications. In addition, these gaskets are installed in high pressure vessels and pumps.
How They Work
Under axial compressive load, ring type joints plastically deform and flow into the irregularities of the flange groove. Since the load bearing area of the ring type joint is relatively small, very high surface stresses result between the sealing faces of the ring type joint and the groove. These stresses are further increased on the Style RX and BX rings which allows very high internal pressures to be sealed. Since ring type joints are solid metal, their recovery characteristics are poor. The seal is maintained by the action of axial load upon the gasket.
Reuse
Ring type joints are designed to have a limited amount of positive interference, which ensures that the ring type joint seats correctly into the groove on compression. Their reuse is not recommended for two reasons:
1. The initial seating of the gasket will be impaired
2. When the gasket is plastically deformed, work hardening of the external metal surface occurs. This may result in permanent damage to the groove.
Collected by Wellgreen
1. The initial seating of the gasket will be impaired
2. When the gasket is plastically deformed, work hardening of the external metal surface occurs. This may result in permanent damage to the groove.
Collected by Wellgreen