Raised face weld neck (RFWN) flanges are among the most commonly used flange types in the piping industry, particularly for applications requiring high pressure and reliability. These flanges are easily recognizable due to their distinctive tapered hub, which is specifically designed to match the wall thickness (bore) of the connected pipe. The bore of the flange is meticulously machined to correspond with the inside diameter (ID) of the pipe or fitting, ensuring a seamless and efficient flow of materials. This design creates a smooth transition to and from the weld neck flange, effectively preventing turbulence at the welding neck and enhancing overall system performance.
Key Benefits of Weld Neck Flanges
Weld neck flanges are engineered to provide exceptional reinforcement in high-pressure applications. The unique tapered design of the welding neck not only contributes to the flange’s ability to withstand significant internal pressure but also plays a crucial role in distributing stress evenly across the joint. This design feature is particularly beneficial in reducing low cycle fatigue, which can result from line expansion or other variable forces that may act on the piping system.
Additionally, the RFWN flange allows for a more substantial connection between the pipe and the flange, making it ideal for welded hose applications. The integrity of the weld joint is critical in maintaining a leak-proof system, and the welding neck flange is designed to enhance this strength. When used in conjunction with welded hose, the welded neck flange ensures that the connection is secure, minimizing the risk of failure in high-stress environments.
Applications of Weld Neck Flanges
Weld neck flanges are widely used across various industries, including oil and gas, chemical processing, and power generation. Their ability to handle high-pressure environments makes them suitable for critical applications where safety and reliability are paramount. In these industries, the weld neck flange is often preferred due to its strong performance and durability.
Welded Neck Flange: Stainless Steel / Carbon Steel
| HOSE SIZE |
1/2 | 3/4 | 1 | 1-1/4 | 1-1/2 | 2 | 2-1/2 | 3 | 4 | 5 | 6 | 8 | 10 | 12 |
| A | 2.50 | 2.81 | 2.93 | 3.00 | 3.19 | 3.25 | 3.75 | 3.75 | 4.00 | 4.50 | 4.50 | 5.00 | 5.00 | 5.50 |
| B | 1.88 | 2.06 | 2.19 | 2.25 | 2.44 | 2.50 | 2.75 | 2.75 | 3.00 | 3.50 | 3.50 | 4.00 | 4.00 | 4.50 |
