10 Piece (MOQ)
| Business Type | Manufacturer, Exporter, Retailer, Trader |
| Product Name | Long Weld Neck Flanges, LWN Flange, RFLWN Flange |
| Size Range | 1/2 inch (15 NB) to 48 inch (1200NB) |
| Class/Pressure Rating | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Click to view more | |
Product Details
Dimensions
ANSI B16.5, ANSI B16.47 Series A & B, ASA, API-605, MSS SP44, AWWA, Custom Drawings
Coating
Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized
Applications/Usage
Offshore, Oil Field, Shipbuilding, Water System, Natural Gas, Pipe Projects, Electric Power, etc.
Trusted Long Weld Neck Flange Manufacturer
Industrial piping systems demand components that can withstand extreme environments without breaking a sweat. If your operations involve high-pressure, severe temperature fluctuations, or corrosive media, you need a connection that guarantees absolute integrity. As a leading Long Weld Neck Flange Manufacturer, Rising Star Steel Industries Private Limited delivers precision-engineered flanged solutions designed to extend the life of your infrastructure and secure your critical flow lines.
What is a Long Weld Neck Flange?
Unlike standard weld neck flanges, a long weld neck (LWN) flange features an extended, straight hub that acts as a nozzle. This unique design eliminates the need for a separate pipe nipple weld, reducing the overall number of joints in your system. By moving the weld seam away from the high-stress base area, LWN flanges significantly lower the risk of fatigue failures, making them the industry standard for demanding processing units.
Key Benefits & Applications
- Enhanced Structural Strength: The heavy, tapered hub provides robust reinforcement, making these flanges exceptionally resilient against structural bending and thermal expansion.
- Fewer Welds, Lower Risks: By acting as a self-contained nozzle, it cuts down on welding requirements during installation, saving labor costs and reducing potential leak paths.
- Smooth Internal Flow: The boring matches your specific pipe schedule perfectly, minimizing turbulence, erosion, and pressure drops within the line.
- Versatile Use Cases: Widely utilized as nozzles on pressure vessels, heavy-duty heat exchangers, oil refineries, gas processing plants, and chemical manufacturing facilities.
Why Partner with Rising Star Steel Industries?
At Rising Star Steel Industries Private Limited, we don't just manufacture parts; we build reliability. Every long weld neck flange leaving our facility undergoes rigorous quality checks to meet international standards like ASME, ASTM, and API. We utilize premium-grade carbon steel, stainless steel, and high-performance alloys to ensure your components endure the toughest operational environments. With our advanced manufacturing capabilities, we offer tailored dimensional setups to fit your exact engineering blueprints seamlessly.
Ready to Secure Your Piping Network?
Don't compromise on industrial safety and system longevity. Get in touch with our engineering team today to discuss your project requirements, request a detailed quote, or explore our custom fabrication options. Let us help you elevate your system's performance.
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Long Weld Neck Flange FAQs
Long weld neck (LWN) flanges are primarily used as nozzles on high-pressure equipment like pressure vessels, heat exchangers, and storage tanks. Because they feature an extended, straight hub, they act as a built-in pipe extension. This makes them ideal for demanding industries like oil and gas, petrochemical processing, and power generation where severe temperature and pressure fluctuations are common.
The main difference lies in the length of the hub. A standard weld neck flange has a short, tapered hub that requires a pipe section (nipple) to be welded to it. A long weld neck flange has a much longer, straight cylinder-like hub that connects directly to the vessel or equipment, completely eliminating an extra welded pipe joint.
As a quality-driven manufacturer, we produce long weld neck flanges in a wide variety of materials to suit different environments. This includes high-strength carbon steel for standard pressure lines, stainless steel for exceptional corrosion resistance, and specialized high-performance alloys for extreme chemical and thermal environments.
By design, an LWN flange moves the weld seam completely away from the high-stress base area where the flange attaches to the vessel. Furthermore, because it replaces a separate nozzle and pipe section, it reduces the total number of welds in your piping system. Fewer welds mean fewer potential weak points and leak paths, which significantly boosts overall industrial safety.
All of our flanges are manufactured, inspected, and tested in strict compliance with globally accepted industry standards. This includes ASME/ANSI B16.5 (for pipe flanges), ASTM material specifications, and API standards, ensuring complete compatibility and reliability in international engineering projects.
Yes, provided they are made from the right material. For highly corrosive applications—such as marine environments, chemical processing, or sour gas lines—we recommend opting for stainless steel (like 316L) or nickel alloys. Our technical team can help you select the ideal material grade based on your specific media and operational demands.
