Product Name: Opposite Ring Flange
Product Type: Forged Flanges
Size Range: DN15 (1/2") – DN3600 (144")
Pressure Rating: Class 150 – Class 2500 | PN2.5 – PN420
Manufacturing Process: Forging / CNC Machining
Surface Finish: RF (Raised Face), RTJ (Ring Type Joint), FF (Flat Face)
Application: Oil & Gas, Petrochemical, Refinery, Pipeline, Offshore
Inspection: Dimensional Inspection, PMI, UT, MT, RT (as required)
Opposite Ring Flanges are precision-forged flanges designed to provide reliable and leak-free connections for welded pipeline systems in industrial applications.
Suitable for high-pressure and high-temperature pipelines
Compliant with ASTM, ASME, EN, DIN, BS, GB/T international standards
Ideal for global energy, petrochemical, and EPC projects
| Specification | Range |
|---|---|
| Flange Size | DN15 (1/2") – DN3600 (144") |
| Pressure Rating | Class 150 – Class 2500 / PN2.5 – PN420 |
| Face Type | Raised Face (RF) / Ring Type Joint (RTJ) / Flat Face (FF) |
Suitable for upstream, midstream, and downstream pipelines in oil & gas, chemical, and power industries.
ASME: B16.5, B16.47, B16.48
Pipeline Standards: MSS SP-44, AWWA C207
European Standards: EN 1092-1, DIN 86044
British Standards: BS 4504, BS10
Chinese Standards: HG/T 20592–20635, SH/T 3406, GB/T 9124, GB/T 9115, GB/T 13402
Our opposite ring flanges are multi-standard compatible and integrate seamlessly into global piping systems.
We offer a wide range of materials to meet corrosion, temperature, and pressure requirements:
Carbon & Low-Temperature Steel: ASTM A105 / A105N, ASTM A181 Gr.1, ASTM A350 LF1–LF6, ASTM A694 F42–F70
Alloy Steel: ASTM A182 F11, F22, F5, F9; EN 10222-2 (P245GH, P250GH, P265GH, 16Mo3, 14CrMo4-5)
Stainless & Duplex Steel: ASTM A182 F304, F304L, F316, F316L, F321, F347; Duplex & Super Duplex (F51, F53, F55, F60)
Nickel & Specialty Alloys: Inconel 625, Incoloy 825, Monel 400/500, Hastelloy C276, Copper-Nickel, Titanium
All materials come with full Mill Test Certificates (MTC) and traceability.
Raw material inspection
Forging and heat treatment
CNC precision machining
Surface finishing (RF, RTJ, FF)
Dimensional inspection & non-destructive testing
Opposite ring flanges ensure excellent mechanical strength, corrosion resistance, and long-term reliability in critical pipeline systems.
Every flange undergoes strict inspection:
Dimensional checks
Chemical composition analysis
Ultrasonic Testing (UT)
Magnetic Particle Testing (MT)
Radiographic Testing (RT)
Ensuring stable quality and compliance with international standards.
Oil & gas transmission pipelines
Petrochemical and refinery piping systems
Offshore platforms and FPSO projects
High-pressure, high-temperature industrial pipelines
Opposite ring flanges are essential for safe and stable pipeline operation.
Wide size range: DN15–DN3600 (1/2"–144")
High-pressure rating: Class 150 – Class 2500 / PN2.5 – PN420
Compliant with ASTM, ASME, EN, DIN, GB/T standards
Multiple materials for harsh environments
Stable quality suitable for long-term industrial projects
