astm a150 carbon steel flange is mainly used in the installation of pipelines. High-pressure flange connection is an important connection method for pipeline construction. It mainly connects the connection between the pipe and the pipe, which plays an important role and value. The high-pressure flange connection is to fix two pipes, pipe fittings or equipment on a flange plate respectively, add flange pads between the two flange plates, and fasten them together with bolts to complete the connection. Some pipe fittings and equipment have their own flanges, which are also flange connections.