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The Ring Type Joint (RTJ) gasket is a forged ring that fits into the machined groove of an RTJ flange. The ring type joint gaskets are either octagonal or oval in cross-section
They are dimensionally suitable for use with flanges manufactured as per standards ASME B 16.5, ASME B16. 47, and API 6A
Their reuse is not recommended for two reasons: The initial seating of the gasket will be impaired. This may result in permanent damage to the groove.
The RTJ gasket material is selected on a number of grounds; primarily chemical compatibility with the media and the hardness of the flange.
The gasket material ideally needs to be roughly 30 Brinell less than the flange material to ensure sufficient deformation of the gasket without damaging flange surface.
Oval & Octagonal
Octagonal RTJ is an improvement on the original oval RTJ design. Ultimately it depends on the flange design. 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 sealing efficiency than the Oval cross section and is therefore preferred.
RTJ gaskets can withstand aggressive chemicals and temperatures up to 1,000°C with properly selected metal.
Ring joint gaskets are metallic sealing rings suitable for high pressure and high temperature applications and are fitted in ring groove type flanges.
Ring Type Joints are widely used in the Oil & Gas and Petrochemical industry, in valves and pipe-work.
The side wall surface finish of the gasket groove shall not exceed 1.6Â micro meter (63Â micro inch CLA) roughness.
Downloads
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Ring Joints
Typical RTJ Gasket Material Material Std.RTJ hardness
(Brinell)
Max. Temp
(°C)
Identification Soft iron 90 400 D Low carbon steel 120 500 S 4%-6% Cr 1/2% Mo: F5 130 500 F5 SS304 160 550 S304 SS316 160 600 S316 SS321 160 800 S321 SS347 160 800 S347 SS410 170 500 S410 Inconel 625 - 450 625 Incoloy 825 - 450 825 Hastelloy C-276 - 450 C-276 Duplex - 800 S31803 Titanium - 350 TI -
FAQ
The Ring Type Joint (RTJ) gasket is a forged ring that fits into the machined groove of an RTJ flange. The ring type joint gaskets are either octagonal or oval in cross-section
They are dimensionally suitable for use with flanges manufactured as per standards ASME B 16.5, ASME B16. 47, and API 6A
Their reuse is not recommended for two reasons: The initial seating of the gasket will be impaired. This may result in permanent damage to the groove.
The RTJ gasket material is selected on a number of grounds; primarily chemical compatibility with the media and the hardness of the flange.
The gasket material ideally needs to be roughly 30 Brinell less than the flange material to ensure sufficient deformation of the gasket without damaging flange surface.
Oval & Octagonal
Octagonal RTJ is an improvement on the original oval RTJ design. Ultimately it depends on the flange design. 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 sealing efficiency than the Oval cross section and is therefore preferred.
RTJ gaskets can withstand aggressive chemicals and temperatures up to 1,000°C with properly selected metal.
Ring joint gaskets are metallic sealing rings suitable for high pressure and high temperature applications and are fitted in ring groove type flanges.
Ring Type Joints are widely used in the Oil & Gas and Petrochemical industry, in valves and pipe-work.
The side wall surface finish of the gasket groove shall not exceed 1.6Â micro meter (63Â micro inch CLA) roughness.
Ring Joints
Std.RTJ hardness
(Brinell)
Max. Temp
(°C)