Ring Type Joint (RTJ Flange Facing)
Engineering definition, metallurgical mechanisms, standard testing specifications, and manufacturing guidelines for closed-die forgings up to 50 kg.
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A specialized flange facing featuring a precision-machined trapezoidal ring groove engineered to seat an octagonal or oval solid metallic ring gasket.
Technical Explanation & Metallurgical Principles
Ring Type Joint (RTJ) flanges are engineered for the most severe high-pressure and high-temperature services (Class 600# to 2500#, subsea wellheads, offshore sour gas). Bolt pre-tension compresses the solid metal ring gasket into the angled sidewalls of the groove, yielding metal-to-metal sealing capable of containing pressures over 10,000 psi (690 bar).
Key Engineering Specifications & Parameters
| Technical Parameter / Metric | Engineering Benchmark / Value |
|---|---|
| Groove Profile | Trapezoidal with 23° angled sealing sidewalls |
| Gasket Geometry | Solid Octagonal (R, RX) or Oval metal ring |
| Roughness Requirement | Groove sidewalls must be smooth (max 63 µin / 1.6 µm Ra) |
Application at Jayesh Forge (Rajkot Plant)
Precision CNC grooved on high-pressure Class 600#, 900#, 1500#, and 2500# flanges strictly up to 50 kg.
Related Materials, Standards & Products
Applicable Material Grades
Related Metallurgical & Testing Terms
Raised Face (RF Flange Facing)
A raised annular gasket sealing surface elevated 1/16" (1.6mm) or 1/4" (6.4mm) above the flange bolt hole circle.
ASME B16.5 Pipe Flanges Standard
The definitive American standard covering pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges NPS 1/2 through NPS 24.
Sour Service (Wet H2S Environment)
Piping and pressure equipment operating in environments containing moisture and hydrogen sulfide (H2S) at partial pressures exceeding NACE threshold limits.
Questions Regarding Ring Type Joint (RTJ Flange Facing)
Yes, the metal gasket must always be softer than the flange material (e.g. soft iron or annealed 316 ring) to ensure plastic deformation of the gasket rather than damaging the reusable flange groove.
Request a Forging Quote with Ring Type Joint (RTJ Flange Facing) Compliance
Our Rajkot metallurgy desk is ready to review your technical drawings, testing protocols, and delivery schedules for custom closed-die forgings strictly up to 50 kg.