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A Long Weld Neck Flange is a type of flange characterized by an extended neck length that provides enhanced stress distribution and reduced turbulence in the piping system. It is designed to be welded to the pipe via a butt weld, ensuring a strong, leak-proof connection ideal for high-pressure and high-temperature applications.
Manufactured from high-quality materials such as carbon steel, stainless steel, and alloy steels, long weld neck flanges offer superior durability, corrosion resistance, and excellent mechanical strength. Their extended neck design helps in minimizing stress concentration and is suitable for critical systems in industries like oil & gas, petrochemical, power plants, and refineries.
Available in various pressure classes including Class 150, 300, 600, and above, long weld neck flanges ensure reliable performance in demanding environments. Their precision machining and butt weld connection provide a seamless integration with piping, making them ideal for high-stress and cyclic loading conditions.
| Specification | Details |
|---|---|
| Product | Long Weld Neck Flanges |
| Size Range | 1/2" to 48" (DN15 to DN1200) – Custom sizes available |
| Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500 (As per ASME B16.5) |
| Face Type | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) – on request |
| Standards | ASME B16.5, ASME B16.47, ASTM A105, ASTM A182, MSS-SP-44, ISO 9001, EN 1092-1 (on request) |
| Material Grades |
Carbon Steel: ASTM A105, A350 LF2 Stainless Steel: 304, 304L, 316, 316L Alloy Steel: ASTM A182 F1, F11, F22 Duplex Steel: UNS S31803, S32205 Nickel Alloys: Inconel 600/625, Monel 400, Hastelloy C276 |
| Manufacturing Process | Forged, Heat Treated, Machined |
| Ends | Long Weld Neck with Butt Weld End |
| Surface Finish | Black Painted, Pickled, Sand Blasted, Polished, Anti-Rust Coated |
| Testing & Certification | Hydrostatic Test, NDT (UT, RT, MT), PMI, Hardness Test, TPI Inspection, Mill Test Certificates (EN 10204 3.1 / 3.2) |
| Applications | Oil & Gas, Petrochemical, Power Generation, Refining, Marine, Chemical Processing, High-Pressure Steam, HVAC Systems |
| Special Features | Enhanced Stress Distribution, Reduced Turbulence, High-Pressure Handling, Durable Performance, Corrosion Resistance, Suitable for High-Temperature Environments |
| Long Weld Neck Flange Design Features |
Extended Neck: Provides superior stress distribution and reduces turbulence. Butt Weld Connection: Ensures strong, permanent, leak-proof joints. High Strength: Forged construction for excellent mechanical properties. Standards Compliant: Manufactured per ASME, ASTM, and ISO standards. Precision Machined Bore: Matches pipe ID to ensure smooth flow and reduce erosion. |
Our Long Weld Neck Flanges are engineered for high-pressure, high-temperature piping systems. Designed for durability and precise alignment, they offer excellent stress distribution, strong butt weld connections, and superior resistance to fatigue and corrosion.
Long weld neck flanges feature an extended neck that provides superior stress distribution, minimizing stress concentration at the base of the flange.
Forged construction with butt weld ends ensures these flanges withstand high pressure and high-temperature environments effectively.
Manufactured using high-quality carbon steel, stainless steel, and alloy materials to provide excellent corrosion resistance and fatigue life in demanding applications.
Produced as per ASME B16.5, ASME B16.47, and ASTM standards, ensuring dimensional accuracy and compatibility with global piping systems.
Bore dimensions precisely match the pipe ID, ensuring smooth flow and reducing erosion and turbulence within the pipeline.
Commonly used in oil & gas, petrochemical, power plants, shipbuilding, and chemical processing industries for critical high-pressure and high-temperature piping systems.