Product Introduction
A long weld neck flange, also known as LWN flange, is a specialized type of flange. It has an extended neck, longer than a standard weld neck flange. This unique design allows it to act as a boring extension. It's usually made of carbon steel, stainless steel or other alloys. Often used in high-pressure and high-temperature industrial applications like the oil, gas and petrochemical industries, it can transfer stresses to the pipe, reducing stress concentrations. The flange end and sealing face usually comply with ASME B16.5 or ASME B16.47. The long weld neck flange has advantages like high durability and strength, but it also has drawbacks such as high cost and complex installation.
Product advantages and features
High Strength: The extended neck design of long weld neck flanges leads to a more even load distribution over the pipe, reducing the risk of bending, leakage, or failure, making them suitable for high-pressure applications.
Good Sealing Performance: The long neck provides a smooth transition from the pipe to the flange, and with proper welding and gasket installation, it can achieve a good sealing effect, which is suitable for transporting expensive, flammable, explosive, toxic media.
Excellent Thermal Performance: In high-temperature applications, the long neck can conduct heat effectively, reducing thermal stress on the joint and minimizing the risk of thermal expansion effects.
Smooth Flow: The bore of the long weld neck flange matches the inner diameter of the pipe, minimizing turbulence and pressure drop in the system, improving the efficiency of fluid flow.
Easy Installation and Maintenance: They are relatively easy to install and maintain compared to some other flange types. The welding process is relatively simple, and the structure is conducive to inspection and repair.
Product Type
According to Pressure Class: It can be divided into different pressure levels such as 150 lbs, 300 lbs, 600 lbs, 900 lbs, 1500 lbs, 2500 lbs under the ANSI standard. In the DIN standard, there are ND-6, 10, 16, 25, 40, etc.
According to Flange Face Type: It includes flat face (FF), raised face (RF), and ring type joint (RTJ).
Product Application
Oil and Gas Industry: They are used to connect high-pressure pipelines, wellheads, and refineries, ensuring the safe and efficient transportation of hydrocarbons.
Chemical Processing: In chemical plants, they are used to connect pipelines transporting corrosive chemicals. Their corrosion-resistant properties make them reliable for handling hazardous substances.
Power Generation: In power plants, they are used to connect pipes that carry hot steam and gases. They can withstand high temperatures and pressures, which is crucial for the efficient operation of turbines and boilers.
Petrochemical Industry: In the petrochemical industry, they are used to connect pipes in the production of various petrochemical products. They can resist aggressive substances.
Nuclear Power: In nuclear power plants, they are essential for connecting cooling and steam pipes. They offer safety and precision, which is vital for reducing accidents and ensuring the proper operation of the plant.
Product material
Carbon Steel: Such as ASTM A105, which has good strength and toughness, low cost, and is suitable for general pressure and temperature conditions.
Stainless Steel: Such as 304, 304L, 316, 316L, etc. It has excellent corrosion resistance and is suitable for occasions where the medium is corrosive or has high hygiene requirements.
Alloy Steel: Such as chromium-molybdenum steel and chromium-molybdenum-vanadium steel. It has high strength, good heat resistance and creep resistance, and is suitable for high-temperature and high-pressure working conditions.
FAQ
Hot Tags: long weld neck flange, China long weld neck flange manufacturers, suppliers, factory, Blind Flange With Npt Thread, Flange with Orifice Welding Neck, Stainless Weld Neck Flange, Weld Neck Blind Flange, Weld Neck Flange Asme B16 5, Weld Neck Pipe Flange
