Ring Type Joint Flange（RTJ）
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A Ring Type Joint (RTJ) Flange is a heavy-duty, high-performance piping flange specifically engineered for extreme high-pressure and high-temperature (HPHT) service. It is distinguished by its precision-machined groove on the sealing face, which holds a solid metal ring gasket to create a superior, leak-proof seal.Core Design & Sealing Principle Grooved Face: The flange face features a precision-machined annular groove designed to securely seat the metal gasket.Metal Gasket: A solid, ring-shaped gasket (typically octagonal or oval in cross-section) is placed within the groove. Common gasket materials include soft iron, carbon steel, stainless steel, or nickel-based alloys, chosen to be softer than the flange material.Metal-to-Metal Seal: When the flange bolts are tightened, the gasket is mechanically compressed and deforms plastically. It flows into the microscopic imperfections of the flange groove, creating an impermeable metal-to-metal seal.Pressure-Energized: The design is inherently pressure-energized; internal process pressure acts on the gasket, pushing it outward to enhance the seal as pressure increases.Key CharacteristicsPressure & Temperature Rating: Primarily used for Class 600 (PN100) and higher pressure ratings, and temperatures typically exceeding 800°F (427°C).Gasket Styles: The most common types are Style R (Octagonal/Oval), Style RX (pressure-energized, interchangeable with R), and Style BX (for ultra-high pressures up to Class 2500).Standards: Manufactured to ASME B16.5, ASME B16.47, and API 6A standards.Flange Types: Available in Weld Neck, Blind, and sometimes Socket Weld configurations.Primary ApplicationsOil & Gas: Wellhead equipment, offshore platforms, and high-pressure transmission pipelines.Petrochemical & Refining: High-pressure reactors, heat exchangers, and steam lines.Power Generation: Boiler circuits, high-temperature/high-pressure steam systems.Chemical Processing: Severe-duty, corrosive, or high-pressure process lines.AdvantagesSuperior Sealing: Provides the most reliable, leak-proof connection for the most demanding HPHT conditions.Durability: Metal gaskets resist degradation from heat, pressure, and chemicals better than soft gaskets.Safety: Critical for systems where leakage could pose catastrophic safety or environmental risks.
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Main products: WN, SO, PL, BL flanges, elbows, tees, reducers, caps. Materials: carbon steel, stainless steel, alloy steel. Standards: ASME, ANSI, EN, JIS, DIN. Export to global pipeline projects. Contact Us