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Ring Joint Gaskets

Ring Joint Gaskets

Ring Joint Gaskets are widely used in the oil and gas, and petrochemical industry in valves and pipe work. Choice of material may be determined to suite higher temperatures in aggressive media. Ring joint gaskets are metallic sealing rings suitable for high pressure and high temperature applications and are fitted in ring groove type flanges. They are designed to seal by initial line contact or wedging action between the mating flanges in the gasket. By applying pressure on the seal interface through bolt force, the softer metal of the gasket flows into the micro-fine structure of the harder flange material creating a very tight and efficient seal.

Two types of ring joint gaskets for metallic pipe flanges are identified by their visual cross-section, octagonal and oval. The oval ring fits the round and flat bottom ring groove flange, while the octagonal shape fits only the modern flat bottom groove flange. The octagonal cross-section has a higher ceiling efficiency than the oval and would be the preferred gasket. However, only the oval cross-section can be used in the old type round bottom groove.

With respect to flange size, pressure class, an appropriate flange standard ASME B 16.20, identifies ring joint gaskets as; R/ RX / BX. R-type ring joint gaskets are available in oval or octagonal cross-section and manufactured in accordance to API 6A and ASME B 16.20 to suite API 6B and ASMEB 16.5 and ASME B 16.47 series A flanges. These gaskets are used in pressures up to 10,000 PSI with the octagonal type having a higher sealing coefficient than the oval therefore, being the better gasket of the two.


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