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Ring Joints Gasket manufacturers in Dubai UAE
The ring-type joint was initially developed for use in the petroleum industry, where high pressure/temperature applications necessitated 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.
The 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.
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.
Hardness of Materials
On compression of the flange assembly, it is imperative that the ring type joint be significantly softer than the flange groove so that the gasket plastically deforms and not the groove. The use of harder ring-type joints can result in flange groove damage. For this reason, ring type joints are supplied with the following maximum hardness values: