RX ring gaskets are similar in shape to the standard octagonal ring joint gasket but their cross section is designed to take advantage of the contained fluid pressure in effecting a seal. They are both made to API 6A and interchangeable with standard Octagonal and Oval rings for oil field drilling and production applications in API 6B flanges. RX is used at pressures up to 5,000 PSI. The sealing surfaces on the Ring Joint Gasket and Grooves must be smoothly finished to 63 micro inches and to be free of objectionable ridges, tool or chatter marks. The hardness of the Ring Gaskets should always be less than the hardness of the flanges to prevent flange deformation. Dimensions Ring Joint Gaskets are covered in ASME B16.20 and API 6A standard. These Gaskets are used in ASME B16.5 flanges, API 6B flanges and API 6BX flanges.
