The difference between anchor flanges and weld neck flanges

When it comes to piping systems,the choice of flange is critical to ensure stability and performance. In this article, we will mainly introduce the differences between anchor flanges and weld neck flanges.

Anchor Flanges

Anchor flanges are specifically designed to restrain pipe movement in a piping system. They are characterized by their two hubs on either side, which are welded to the pipes, and notably, they do not have bolt holes. This design allows anchor flanges to immobilize the pipe at predetermined locations, transferring built-up stresses to external structures. They are typically embedded in concrete thrust blocks to distribute the load over a larger surface area.

Weld neck flanges, on the other hand, feature a long neck that gradually tapers down to the flange. This design provides a smooth transition between the pipe and the flange, making them suitable for high-stress applications. Weld neck flanges are welded directly to the pipe, creating a strong, integral connection that can withstand high pressure and temperature conditions.

Weld neck flange WN flange A182 Gr F321 RTJ ASME B16.5

Here is a comparison of the two：

Anchor Flanges: No bolt holes; designed to restrain movement.

Weld Neck Flanges: Feature a long neck with bolt holes; designed for strong connections.

Functionality:

Anchor Flanges: Focus on immobilizing pipes and transferring stresses to external structures.

Weld Neck Flanges: Provide strong, reliable connections in high-pressure systems.

Both anchor flanges and weld neck flanges are essential components in piping systems, each serving unique purposes. Understanding the differences between these two types of flanges can help in selecting the right component for specific applications, ensuring the safety and efficiency of the piping system.