08,Nov 2024
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A long weld neck flange (LWN flange) is a type of weld neck flange with an extended neck, commonly used in high-pressure and high-temperature industrial applications.
This unique neck length allows it to act as a boring extension — providing a reinforced connection in demanding environments.
Industries such as oil, gas, and petrochemical sectors often choose long weld neck flanges for their durability and structural stability.
Below, we’ll explore the core features, benefits, and maintenance tips of LWN flanges to help you understand why these flanges are essential for specialized industrial applications.
A long weld neck flange is a variation of the standard weld neck flange, with a more extended neck that resembles a nozzle and can substitute for a short section of pipe.
Unlike regular welding neck flanges used in conventional piping, long weld neck flanges feature a straight or square-cut end.
This design allows these flanges to directly connect to tanks or assembly structures, providing increased support and reducing pressure drop across the connection point.
Due to their construction, LWN flanges excel in high-stress environments and are often seen in critical applications involving extreme pressure or temperature.
Weld neck flanges are integral in environments where reliable, leak-proof connections are essential.
They’re often found in piping systems transporting pressurized gases or hazardous fluids, where the integrity of the connection can’t be compromised.
The flange weld process creates a stable joint by welding the neck flange to the pipe, aligning with the pipe’s bore for smooth flow.
In addition to high-pressure applications, welding neck flanges are frequently used in industries where temperature changes and vibrations occur, providing a secure, reinforced connection point in pipelines.
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Advantages |
Disadvantages |
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High durability and strength, suitable for extreme pressure and temperature conditions. |
High cost compared to standard flanges. |
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Reduces stress concentration at the connection point. |
More complex installation due to the required square cut. |
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Suitable for direct use with tanks and large assemblies, eliminating the need for additional pipe sections. |
Requires precise alignment during welding, increasing setup time. |
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Customizable in length, allowing flexibility for different applications. |
Non-standard length requires custom ordering, leading to extended lead times. |
While long weld necks are occasionally called nozzles, they aren’t typically welded to pipes like regular weld neck flanges.
The ends of LWN flanges are cut square to fit directly with tanks or other assemblies instead of being welded to pipes.
This square-cut design offers a secure fit without requiring a schedule bore — making them different from weld neck flange welding that involves fitting directly onto pipe schedules.
The bore size in regular long weld neck flanges matches the nominal size of the flange, such as a 2-inch bore for a 2-inch neck flange.
LWN flanges come in various lengths to accommodate the needs of different industrial applications, with common options including 9-inch, 12-inch, and 16-inch lengths.
However, the length of an LWN flange is highly customizable based on the application requirements.
Larger nominal size and pressure classes often correspond with increased lengths, though the final choice depends on the specific requirements of the installation.
Contrary to what some may assume, there’s no universal standard length for LWN flanges since each flange can be tailored to the assembly’s unique specifications.
Despite their structural advantages, long weld neck flanges may encounter issues related to misalignment, corrosion, and stress concentrations, particularly in high-pressure environments.
Misalignment during installation can cause leaks or stress at the connection point, while corrosion—common in petrochemical and marine industries—can affect the flange material and compromise the weld strength.
These flanges may also be challenging to replace or repair due to their non-standardized lengths, making them more costly over the long term.
When selecting a long weld neck flange, consider the specific application requirements, such as pressure, temperature, and environmental exposure.
Look into weld neck flange sizes to ensure compatibility with the intended pipeline or tank.
Custom lengths may also be necessary if standard sizes don’t fit.
In addition, choosing a reliable manufacturer with a strong quality assurance process can prevent common manufacturing defects, ensuring you receive a flange that meets your needs.
For reliable and high-quality long-weld neck flanges, Long’An is a standout choice.
Long’An leverages an advanced online ERP system to ensure seamless data flow from raw material intake to finished product dispatch.
By embracing paperless production, the company ensures rigorous quality control at every stage, including digital tracking for precise measurements and specifications.
Long’An has an impressive manufacturing network of over 100 locations worldwide and offers 13 years of expertise in welding neck flange production, adhering to ISO14001, ISO45001, and ISO9001 standards — security to dependable products for global customers.
Contact Long’An today!
Socket weld flanges are designed to be welded on the pipe’s exterior, while weld neck flanges weld to the pipe’s bore, creating a smooth flow path. Weld neck flanges are ideal for high-pressure systems.
Weld neck flanges tend to be more expensive and time-consuming to install than other flange types, primarily due to the precision required for alignment and welding.
Yes, two weld neck flanges can be welded together for specific applications, but the process demands precision welding techniques to ensure a reliable and secure joint.
Resources:
Long Weld Neck Flanges – What You Need To Know
Common Uses for Long Weld-Neck Flanges
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