Weld Neck Flange

Weld Neck Pipe Flanges Definition:

A weld neck flange (WN flange) means a flange has a neck for weld with the pipe, it is easily to recognized by their long tapered neck on the flange (The neck is also called hub in the weld neck flange). The tapered neck can supply a high strength reinforcement to support flange and pipe. It means the weld neck flange is suitable to used in high pressure and extremely temperature situation. 

Connection of Weld Neck Flange:

The weld neck flange is connected with the pipe from the neck in butt welding method, that means the neck should be have same material and same outer diameter and wall thickness with the pipe. The butt welding joint could provide a strong connection between the pipes and flanges which is better for high pressure application.

Sealing Face of Welding Neck Flange: 

With a neck on one side of the flange, the other side of the flange is sealing face, which are between the two flanges joint. WN flange usually supplied with flat face (FF), raised face(RF) and ring type joint (RTJ). The raised face has a height on the flange rather than the flat face, the RTJ face is used to contain the gasket ring which are specially for high pressure application. 

Dimensions of Weld Neck Flange:

In different standard for weld neck flange, the dimensions of the flange and sealing face have a different technical data, it is necessary to confirm all the details to make sure the flange can match the joint with the pipe and another flange. Except the standard and specification information, the neck data is also important, it means the thickness of the neck also should be provide to confirm a weld neck flange.

Advantages of Weld Neck Flanges:

Flange factory of Hebei Haihao Group has 34 years professional experiences in the steel flanges production, our weld neck flanges have following advantages:

1. The weld neck flange is suitable to used for high pressure, high temperature, low temperature situation because of the butt welding connection method.
2. The weld neck flange has a good excellent stress distribution by its tapered neck .
3. The butt welding joint can be inspected easily ,for example the radiography testing. 

Those advantages make the weld neck flange of Hebei Haihao group widely used in industry application.