Do you know about Ring Type Joint (RTJ) gasket?

Ring type joint gaskets are also known as RTJ gasket or O-ring Gaskets. These gaskets are used for high-pressure services. They are solid rings of metal (cut from plate, pipe or a forged ring) in different cross sections such as oval, round, octagonal. Special RTJ gasket comes with a hole in the center for pressure equalization in subsea pipeline application. You can see the different types of RTJ gasket in the image below.

Different types of RTJ gasket

Ring joint gaskets are used with ring type joint (RTJ) flanges. A high surface stress is developed between an RTJ gasket and the flange groove when RTJ gasket is bolted to a flange. This leads to plastic deformation of this gasket. Thus, the hardness of the gasket is kept less than the hardness of the flange groove. The only thing you have to take care is that hardness of the gasket shall always be less than flange material by at least 50 BHN.

ASME B16.20 S304 ring type joint gasket

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Ring type joint gasket RTJ gasket