Weld Neck Flange Manufacturer
High strength and durability
Excellent sealing performance
Long-term cost-effectiveness
High Quality Weld Neck Flange
SSM provides the Weld Neck Flange (WN Flange), which is a high-strength pipe connection commonly used in high-pressure and high-temperature applications. Its long tapered neck reinforces the connection between the flange and the pipe, reducing stress concentration. The WN flange is suitable for use with various materials, including carbon steel, stainless steel, and alloy steel, to meet the demands of different working conditions.
- Size: 1/2″ to 48″
- Pressure Rating: Class 150, 300, 600, 900, 1500, 2500
- Joint Type: Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
- Material: Carbon steel, stainless steel, nickel alloy, duplex stainless steel, aluminum, copper-nickel alloy
What is a Weld Neck Flange
A weld neck flange is designed for pipe connections with a long, tapered neck. The neck is made to match the outer diameter of the pipe and is welded to the pipe using butt welding. This design helps to reduce stress concentration, providing a strong and stable connection, especially in high-pressure and high-temperature environments.
Welding Neck Flange Cross Section
Advantages of Weld Neck Flanges
High Strength and Durability
The Weld Neck flange is designed with a long neck that is connected to the pipe by butt welding. This design provides exceptional strength and durability, making it suitable for high-pressure and high-temperature environments.
Uniform Stress Distribution
The long neck of the flange matches the outer diameter of the pipe, which helps to reduce stress concentration and allows for more even distribution of pressure and temperature changes. This reduces the risk of system failure.
Excellent Sealing Performance
With butt welding connections, the flange provides good sealing, making it ideal for applications that require leakage prevention, such as chemical, oil, and gas pipeline systems.
High and Low Temperature Resistance
Additionally, this flange is suitable for extreme temperature environments and can withstand stress under high or low-temperature conditions without losing its strength and integrity.
Weld Neck Flange Dimensions
Below are the dimensions for a Class 300 Weld Neck Flange
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Thickness (T) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Hole Diameter | Hub Diameter (Bore Size) | Length through Hub (H) |
| 1/2″ | 3.75″ (95 mm) | 0.62″ (16 mm) | 2.38″ (60 mm) | 4 | 0.62″ (16 mm) | 0.84″ (21 mm) | 2.19″ (56 mm) |
| 3/4″ | 4.62″ (117 mm) | 0.75″ (19 mm) | 3.00″ (76 mm) | 4 | 0.75″ (19 mm) | 1.05″ (27 mm) | 2.50″ (64 mm) |
| 1″ | 4.88″ (124 mm) | 0.88″ (22 mm) | 3.38″ (86 mm) | 4 | 0.75″ (19 mm) | 1.32″ (34 mm) | 2.81″ (71 mm) |
| 1 1/4″ | 6.12″ (155 mm) | 1.00″ (25 mm) | 4.75″ (121 mm) | 4 | 0.88″ (22 mm) | 1.90″ (48 mm) | 3.50″ (89 mm) |
| 1 1/2″ | 6.50″ (165 mm) | 1.12″ (29 mm) | 5.00″ (127 mm) | 8 | 0.75″ (19 mm) | 2.38″ (60 mm) | 3.88″ (99 mm) |
| 2″ | 8.25″ (210 mm) | 1.25″ (32 mm) | 6.62″ (168 mm) | 8 | 0.88″ (22 mm) | 3.50″ (89 mm) | 4.88″ (124 mm) |
| 2 1/2″ | 10.00″ (254 mm) | 1.38″ (35 mm) | 7.88″ (200 mm) | 8 | 0.88″ (22 mm) | 4.50″ (114 mm) | 5.94″ (151 mm) |
| 3″ | 12.50″ (318 mm) | 1.62″ (41 mm) | 10.62″ (270 mm) | 12 | 0.88″ (22 mm) | 6.63″ (168 mm) | 7.00″ (178 mm) |
| 4″ | 15.00″ (381 mm) | 1.88″ (48 mm) | 13.00″ (330 mm) | 12 | 1.00″ (25 mm) | 8.63″ (219 mm) | 8.50″ (216 mm) |
| 5″ | 17.50″ (445 mm) | 2.12″ (54 mm) | 15.25″ (387 mm) | 16 | 1.12″ (29 mm) | 10.75″ (273 mm) | 10.00″ (254 mm) |
Note: Dimensions can vary slightly based on manufacturer specifications, so always consult the specific standards or manufacturer data for precise measurements.
One-Stop Flange Provider for All Your Needs
SSM has significant product advantages in manufacturing Weld Neck Flanges. Whether it’s quality or price, we will meet your needs.
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Additional information on Weld Neck Flange
Weld neck flange is one of the most commonly used flanges. Please continue reading for information on flange size, installation, and more.
Installation Process of Weld Neck Flange
Below are the installation steps for a Weld Neck flange:
1. Prepare materials and tools.
2. Inspect and clean the flange and pipe, and align the flange with the pipe.
3. Secure the flange and perform welding.
4. Check the weld for defects.
5. Install gaskets, tighten bolts, and perform a pressure test.
6. Clean the site and regularly inspect the flange connection for proper operation.
Following these steps ensures the correct installation of a Weld Neck flange and guarantees the stability and tightness of the pipeline system.
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FAQ
The dimensions for Weld Neck Flanges are specified by standards such as ASME B16.5. They include nominal pipe size (NPS), outside diameter, thickness, bolt circle diameter, and the number of bolt holes. Dimensions vary based on pressure class (e.g., Class 150, 300, 600) and pipe size.
Regular inspection and maintenance are essential to ensure the integrity of Weld Neck Flanges. Check for signs of corrosion, wear, or damage, and ensure that welds remain intact. Proper maintenance helps prolong the life of the flange and the overall pipeline system.
Weld Neck Flanges are commonly used in industries such as oil and gas, petrochemical, power generation, and chemical processing, where high pressure, temperature, and severe service conditions are present.
- Weld Neck Flanges have a tapered neck that is welded to the pipe, providing a strong and smooth transition.
- Slip-On Flanges slide over the pipe and are welded around the circumference, which can make them easier to install but less strong compared to Weld Neck Flanges.
- Socket Weld Flanges are used for small-bore applications and have a socket where the pipe is inserted and welded.