A flange connection is the process of first fixing two pipes, fittings, or equipment onto a flange, then adding a flange gasket between the two flanges and fastening them together with bolts to complete the connection. Some pipe fittings and equipment already come with flanges, which also belong to flange connections. Flange connection is an important connection method in pipeline construction. The flange connection is easy to use and can withstand high pressure. In industrial pipelines, flange connections are widely used. In the home, the diameter of the pipeline is small and it is low-pressure, so flange connections cannot be seen. If there are flanged pipes and equipment everywhere in a boiler room or production site.