ASME Ring Type Joint Flanges

Raised face flanges seal with a gasket positioned on the raised surface between the flange faces. RTJ flanges use a machined ring groove and a metallic ring gasket. Because their sealing geometries differ, RF and RTJ components are not interchangeable. Selection should match the piping specification, pressure class, service conditions, and mating flange configuration.

Common flange facings include raised face, flat face, and ring type joint. Product information for Twinco Industrial also identifies seal ring groove configurations. Each facing uses a specific gasket arrangement and mating surface, so the face type should be confirmed against the system design, connected equipment, applicable ASME B16 Series requirements, and the required sealing method.

A ring type joint gasket is a metallic gasket designed to fit inside the groove of an RTJ flange. Correct fit, ring selection, flange alignment, and bolt loading are essential for effective sealing. The gasket must match the flange groove and the application specification; it should not be substituted with a raised-face gasket or another incompatible sealing product.

RTJ means ring type joint. In flange terminology, it identifies a facing and sealing arrangement that uses a machined ring groove and a metallic ring gasket. RTJ flanges are used where the piping or equipment specification calls for this controlled metal-to-metal sealing approach, including certain pipeline, petrochemical, testing, and industrial applications.

A ring type joint flange is a flange manufactured with a dedicated groove for a metallic ring gasket. The gasket is compressed between matching flange faces during bolting to form the joint seal. Available material choices may include carbon steel, stainless steel, and nickel alloys, while the required face, class, size, and standard must be confirmed for each project.

A flange joint connects piping, valves, vessels, and other process components while allowing the connection to be assembled, inspected, maintained, or isolated. Flange joints are used in hydrostatic testing, pipeline work, vessel and process-system isolation, petrochemical operations, maintenance shutdowns, and construction. The flange, gasket, bolting, and facing must be compatible with the specified service.