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High Pressure Gas Transmission Pipelines Alloy Steel Ring Type Joint Flanges custom

High Pressure Gas Transmission Pipelines Alloy Steel Ring Type Joint Flanges Manufacturers

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High-Integrity RTJ Flanges for Gas Transmission

Ring Type Joint (RTJ) Flanges represent the pinnacle of flange sealing technology for the highest pressure and highest consequence gas transmission pipeline applications. Unlike raised face flanges that rely on a soft gasket for sealing, RTJ flanges feature a precision-machined groove into which a solid metal ring gasket seats under bolt load, achieving a metal-to-metal seal capable of containing the most demanding gas pressures. Our Alloy Steel RTJ Flanges are manufactured from ASTM A182 F5, F11, F22, and F91 grades, providing the high-pressure strength and elevated temperature resistance required for natural gas, hydrogen, and sour gas transmission. As a professional manufacturer, we machine the RTJ groove geometry to exacting API and ASME standards, ensuring perfect seating of both octagonal and oval metal ring gaskets. These flanges are the standard of choice for Class 900, 1500, and 2500 applications where absolute zero leakage is a regulatory and safety requirement.

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RTJ Flange Technical Specifications

ParameterSpecification Detail
Material GradesASTM A182 F5, F11, F22, F91, F316
Design StandardASME B16.5, API 6A, ASME B16.47
Pressure ClassClass 600 to Class 2500
Ring Gasket TypeOval (R-type) and Octagonal (RX, BX for subsea)
Size Range1/2" to 24" (larger sizes per API 6A)
Groove HardnessHBW ≥ 120 (Softer than ring gasket per API)

Gas Transmission Pipeline Applications

Alloy Steel RTJ flanges are the exclusive choice for the most critical connections in high-pressure gas transmission infrastructure. They are used at compressor station discharge and suction flanges where pressures regularly exceed 10 MPa. At pipeline block valve stations, RTJ flanges provide the leak-tight integrity required for unmanned remote-operated valve installations. In offshore gas export pipelines, RTJ flanges connect riser systems to floating production units. They are also essential for hydrogen transmission pipelines, where the extremely small molecular size of hydrogen demands a metal-to-metal seal to prevent permeation leakage. Subsea applications use specialized BX-type RTJ flanges rated for full hydrostatic and operating pressures at great depth. For sour gas service containing H2S, alloy steel RTJ flanges manufactured to NACE MR0175 provide the sulfide stress corrosion cracking resistance required for safe operation.

Sealing & Structural Advantages

  • Metal-to-Metal Seal: The solid metal ring gasket deforms plastically into the groove upon bolt-up, achieving a leak-tight seal that is impervious to pressure, temperature, and chemical attack.
  • Hydrogen-Tight Integrity: The metal seal prevents the permeation leakage of hydrogen molecules that can occur through soft gasket materials in high-pressure hydrogen service.
  • Self-Energizing Seal: Internal pipeline pressure drives the ring gasket deeper into its groove, making the seal stronger as operating pressure increases.
  • Zero Gasket Degradation: Eliminates soft gasket creep, extrusion, or chemical degradation that can cause flange leaks over time in high-temperature or high-pressure service.

Pipeline Project Supply & Logistics

We support payments via T/T and Irrevocable L/C at sight. For gas pipeline projects, we supply complete RTJ flange sets including matched metal ring gaskets, stud bolts, and heavy hex nuts, simplifying procurement. RTJ groove faces are individually protected with machined steel caps or custom foam inserts to prevent groove damage during transit—a critical requirement given the precision of the sealing surfaces. All flanges are supplied with comprehensive 3.1 Mill Test Certificates, groove dimensional inspection reports, and hardness certification. For sour service applications, full NACE documentation is provided as standard. We have experience supplying to major gas transmission projects across the Middle East, Southeast Asia, and Central Asia, with full customs and export documentation support.

  • Q: What is the difference between R (Oval), RX, and BX ring gasket grooves?
  • A: R-type (oval/octagonal) is for standard ASME B16.5 service. RX is a pressure-energized version for high-pressure wellhead use. BX is for subsea applications and provides a self-energizing seal even without bolt load, designed for full hydrostatic test pressure.
  • Q: Can RTJ flanges be used for hydrogen service?
  • A: Yes, the metal-to-metal seal of RTJ flanges makes them the preferred choice for high-pressure hydrogen transmission, as the metal ring gasket prevents the permeation leakage of hydrogen molecules through soft gasket materials.
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Jiangyin Gaoxin Pipe Fittings Co., Ltd.
About Us
JIANGYIN GAOXIN PIPE FITTINGS CO.,LTD.
Our company is a professional manufacturer of pressure piping components. As High Pressure Gas Transmission Pipelines Alloy Steel Ring Type Joint Flanges Manufacturers，Our product range covers butt-weld, socket-weld, and threaded pipe fittings, including flanges and customized non-standard parts. These products are widely used in industries such as oil & gas, chemical processing, power generation, shipbuilding, papermaking, metallurgy, pharmaceuticals, and food processing. We manufacture according to standards such as ASME, EN,JIS,DIN,ANSI,GOST, MSS, GB/T,HG, DL, SH, SY,and have a complete range of inspection equipment, a strict quality control system, and various certifications（PED,AD2000,EAC, ABS,BV, DNV,NORSOK M650, ISO9001,ISO14001,ISO45001,etc.）, making us a leader in the industry.

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