Difference Between Flat Flange And Weld Neck Flange

The sealing surface of the Flat Flange can be made into three types: smooth, concave and convex and grooved. The application of smooth flat welding flange is the most important, and it is mostly used in the case of medium premise easing, such as low pressure non-purified compressed air and low pressure recirculating water. Its benefit is that the price is cheap. The Weld Neck Flange is a flange with a neck and a transition of the pipe and abutting the pipe.

The welding flange is suitable for pipelines with high pressure, temperature fluctuations or high temperature, high pressure and low temperature pipelines, and also for pipelines with expensive, flammable and explosive media. The Long Weld Neck Flange is not easy to be deformed, sealed, and the application is common. The nominal pressure PN is at 16 MPa.