High-performance Long Neck Flanges from a leading China factory. These weld neck flanges are engineered by expert suppliers for high-pressure and high-temperature applications, featuring a tapered hub for optimal stress distribution and durability.
The Long Neck Flange, widely recognized as the Weld Neck Flange, is a precision-engineered piping component specifically designed for high-pressure and high-temperature industrial environments. Featuring a long tapered hub that seamlessly merges with the pipeline, this flange optimizes stress distribution and significantly reduces the risk of structural deformation, ensuring maximum joint integrity.
Engineered for critical reliability, our Long Neck Flanges minimize turbulence and erosion at connection points, making them indispensable for systems where safety and leak-proof performance are non-negotiable. Available in a broad range of carbon steel, stainless steel, and alloy materials, these flanges provide superior durability and corrosion resistance for the most demanding global industries.
Detailed Parameters
| Pressure Rating | PN6 - PN40 / Class 150 - Class 2500 | Size Range (DN) | DN10 - DN2000 |
|---|---|---|---|
| Size Range (Inch) | ½" - 24" / S.A 12" - 60" | Carbon Steel | ASTM A105, P235GH, P245GH, P250GH, P265GH, ST37-2 |
| Stainless Steel | ASTM A182, SS304, SS306 | Standard Compliance | ASME, EN, JIS, DIN, BS, KS, GOST, SABS, ATK |
| Surface Coating | Black Paint, Galvanize, Grease, Epoxy Paint | Connection Type | Butt-Weld Connection |
| Hub Design | Long Tapered Hub | Application Environment | High-Pressure & High-Temperature |
Key Advantages
Superior Strength
The beveled end creates a high-strength weld trough, ensuring maximum structural integrity under pressure.
Extended Lifespan
High-grade materials like ASTM A105 and SS304 offer exceptional resistance to wear and fatigue.
Stress Optimization
The tapered hub distributes mechanical stress evenly, preventing deformation in volatile conditions.
Flow Efficiency
Advanced internal geometry minimizes turbulence and erosion at the joint for stable fluid flow.
Corrosion Resistance
Customizable epoxy and galvanized coatings protect against harsh chemical and atmospheric environments.
Global Standards
Fully compliant with ASME, DIN, and JIS standards for seamless international project integration.
Product Gallery
Management Platforms
Oil & Gas Pipeline
Ensures leak-proof connections for hydrocarbons in upstream and offshore platforms.
Power Generation
Ideal for high-pressure steam and water lines in nuclear and thermal plants.
Chemical Processing
Handles corrosive hazardous chemicals in reactors and distillation columns.
Petrochemical Plants
Provides stable flow and structural safety for large-scale refinery networks.
Heat Exchangers
Manages extreme temperature transitions with minimal thermal expansion risk.
Boiler Systems
Supports high-pressure water cycles with durable, weld-neck integrity.
Investment Return Comparison
| Feature Metric | Standard Flanges | Long Neck Flanges |
|---|---|---|
| Pressure Stability | Moderate | Exceptional |
| Vibration Resistance | Standard | High (Tapered Hub) |
| Installation Life | Short-Medium | Long-Term Service |
| Maintenance Cost | Regular Repacking | Minimal Intervention |
| Safety Rating | Industrial Grade | Critical Mission Grade |
Frequently Asked Questions
The Long Neck Flange features a tapered hub that merges with the pipe, providing significantly better stress distribution and higher resistance to pressure surges compared to standard flat flanges.
For highly corrosive applications, we recommend Stainless Steel (ASTM A182, SS304, or SS306) combined with specialized epoxy coatings to prevent oxidation and chemical degradation.
Yes, our Long Neck Flanges are manufactured in strict accordance with ASME, EN, JIS, DIN, BS, KS, GOST, SABS, and ATK standards to ensure global compatibility.
We offer a comprehensive range of pressure ratings, from PN6 to PN40 and Class 150 to Class 2500, catering to both low-pressure utility lines and high-pressure industrial systems.
The gradual transition of the tapered hub creates a smoother internal flow path, which reduces the eddy currents and turbulence typically found at abrupt joint transitions.
For offshore and marine environments, we provide high-performance galvanized coatings and heavy-duty epoxy paint to withstand saltwater corrosion and high humidity.
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