A ring type joint gasket (RTJ) is a type of metallic gasket that is commonly used in high-pressure and high-temperature applications, particularly in the oil and gas industry. RTJ gaskets are designed to seal the flanged connections of pipelines, valves, and other equipment used in oil and gas exploration, production, and refining.

The RTJ gasket is a solid metal ring that is usually made of soft iron, low-carbon steel, or a corrosion-resistant alloy such as stainless steel or Inconel. The ring is machined with a special groove that forms a seal when compressed between two mating flanges. The sealing surface of the RTJ gasket is typically a trapezoidal-shaped groove that accommodates the high stresses and pressure differentials encountered in high-pressure applications.

RTJ gaskets are available in several different shapes, including oval, octagonal, and RX. The oval shape is used primarily for flat-bottomed flanges, while the octagonal and RX shapes are used for raised face flanges. The choice of gasket shape will depend on the type of flange being used and the application requirements.

Proper installation of an RTJ gasket requires careful attention to the flange surface finish, bolt torque, and gasket positioning. RTJ gaskets are designed to be reusable, but they must be inspected carefully for damage or deformation before each use.

Overall, ring type joint gaskets are an important component in ensuring safe and reliable sealing in high-pressure and high-temperature applications in the oil and gas industry.