Top-Grade Long Weld Neck Flanges Manufacturer & Supplier in India
Long Weld Neck Flanges (LWN Flanges) are designed for high-pressure and high-temperature applications where structural integrity and stress distribution are critical. Unlike standard weld neck flanges, they feature an extended neck that provides additional reinforcement and allows for a gradual transition of stress from flange to pipe, minimizing the risk of failure in harsh environments.
Vardhman Steel Overseas offers precision-engineered Long Weld Neck Flanges manufactured in accordance with ASTM, ASME, DIN, and EN standards, ensuring superior performance and global compatibility. Our LWN flanges are available in materials such as Stainless Steel, Carbon Steel, Alloy Steel, Duplex, and Super Duplex, with sizes ranging from ½" to 48” and pressure ratings from 150# to 2500#.
Long Weld Neck Flanges are commonly used in heat exchangers, pressure vessels, high-pressure piping systems, offshore drilling, and oil & gas processing—where vibration, bending, and mechanical stress are constant. Their extended hub allows for a better weld and stronger connection, making them ideal for critical and long-term installations.
Partner with Vardhman Steel Overseas for robust, dimensionally accurate Long Weld Neck Flanges that offer unmatched strength, leak-proof performance, and long service life in demanding industrial applications.
Available Materials & Grades
We offer a wide range of high-quality materials and grades to meet diverse industrial requirements and standards.
| Material | Specifications / Grades |
|---|---|
| Stainless Steel | ASTM A182, A240 – F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L |
| Duplex & Super Duplex Steel | ASTM/ASME A/SA182 – F44, F45, F51, F53, F55, F60, F61 |
| Carbon Steel | ASTM/ASME A/SA105, A350, A181 LF2, A516 Gr.70, A36, A694 – F42, F46, F52, F60, F65, F706 |
| Low Temperature Carbon Steel | ASTM A350 – LF2, LF3 |
| Alloy Steel | ASTM/ASME A/SA182 & A387 – F1, F5, F9, F11, F12, F22, F91 |
| Copper Alloy Steel | ASTM SB61, SB62, SB151, SB152 – UNS C70600 (Cu-Ni 90/10), C71500 (Cu-Ni 70/30), C10100, C10200, C10300, C10800, C12000, C12200 |
| Nickel Alloy | ASTM SB564, SB160, SB472, SB162 – Nickel 200 (N02200), Nickel 201 (N02201), Monel 400 (N04400), Monel K500 (N05500), Inconel 600 (N06600), 601 (N06601), 625 (N06625), 800 (N08800), 825 (N08825), Hastelloy C276 (N10276), Alloy 20 (N08020) |
Long Weld Neck Flange – Technical Specifications
Explore the dimensional and performance specifications of our high-strength Long Weld Neck Flanges manufactured by Vardhman Steel Overseas.
| Specification Parameter | Details |
|---|---|
| Product Name | Long Weld Neck Flange (LWN) |
| Size Range | ½” NB to 48” NB (15mm to 1200mm) |
| Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500, DIN ND-6, 10, 16, 25, 40 |
| Facing Types | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| Neck Type | Extended Neck for Butt-Weld Connection |
| Manufacturing Method | Forged / Machined |
| Applicable Standards | ANSI B16.5, ANSI B16.47 Series A & B, MSS SP-44, ASA, API-605, AWWA, Custom Drawings |
| DIN Standards | DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627–DIN2638, DIN2673 |
| BS Standards | BS4504, BS1560, BS10 |
| Testing & Certification | Hydro Testing, PMI, UT, RT, MTC as per EN 10204 3.1 / 3.2, Third-Party Inspection (TPI) |
Features & Benefits
Long Weld Neck Flanges from Vardhman Steel Overseas are engineered for critical applications requiring high structural integrity, pressure resistance, and smooth fluid flow. These flanges are ideal for heat exchangers, pressure vessels, and high-temperature environments.
- Extended Neck Design – Provides additional reinforcement and allows smooth stress transition to piping systems.
- Superior Strength – Designed to handle high-pressure and high-temperature operations reliably.
- Leak-Proof Connection – Welded connection ensures a strong seal and reduces the risk of leakage.
- Ideal for Severe Conditions – Performs efficiently in corrosive, high-stress, and high-load environments.
- Supports Heavy Loads – Long hub supports pipe weight and mechanical stresses effectively.
- Customizable Dimensions – Available in various sizes, pressure classes, and facing types.
- Multiple Facing Options – Available in Flat Face (FF), Raised Face (RF), and RTJ configurations.
- Material Flexibility – Offered in Stainless Steel, Carbon Steel, Duplex, Alloy Steel, and more.
- Conforms to Global Standards – Manufactured as per ANSI, ASME, API, DIN, and BS specifications.
- Trusted Across Industries – Widely used in oil & gas, power plants, chemical, shipbuilding, and offshore platforms.