We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
When it comes to steel pipe flanges, the weld neck flange (WN flange) stands out as one of the most reliable and widely used options. Thanks to its unique neck design, it can effectively transfer stress from the pipe to the base of the flange, reducing pressure concentration and improving overall durability. This makes the weld neck flange especially suitable for high-pressure pipelines, high-temperature systems, and even low-temperature or cryogenic applications. For pipelines or valves with a nominal pressure rating (PN) above 2.5 MPa, the weld neck flange is often the first choice.
Main Types of Weld Neck Flanges
In industrial applications, weld neck flanges are generally available in two types:
1. Reducing Weld Neck Flange
A reducing weld neck flange is designed to connect pipes of different diameters. Acting as a combination of a reducer and a weld neck flange, it allows a smooth transition between pipe sizes while maintaining the strength and sealing performance of a standard flange connection. This makes it ideal for situations where pipeline diameter changes are required without installing a separate reducer.
2. Long Weld Neck Flange (LWN Flange)
The long weld neck flange features an extended neck, resembling a lengthened pipe section attached to the flange. Commonly referred to as an LWN flange, this type is often used as a nozzle connection for columns, barrels, or pressure vessels. Its elongated design provides added reinforcement and stability, ensuring secure performance under demanding working conditions.
Advantages of Weld Neck Flanges
Excellent performance under high pressure and temperature
Smooth stress distribution, reducing the risk of cracking
High sealing reliability for critical piping systems
Versatility with both reducing weld neck flange and long weld neck flange options
Applications of Weld Neck Flanges
Oil and gas pipelines
Petrochemical processing plants
Power generation systems
Pressure vessels and reactors
Marine and shipbuilding industries
Conclusion
The weld neck flange is a trusted choice for engineers and project designers working with critical piping systems. Whether you need a reducing weld neck flange for size transitions or a long weld neck flange for vessel nozzles, selecting the right type of weld neck flange ensures strength, safety, and long-term reliability.
English
Español
Français
بالعربية
