Flange connections involve fixing two pipes, fittings, or equipment to separate flange discs first, then inserting a flange gasket between the two flange discs and securing them together with bolts, thus completing the connection. Some fittings and equipment come with their own flange discs and are also considered flange connections. Flange connections are an essential method for pipeline construction. They are convenient to use and can withstand high pressure. In industrial pipelines and residential settings, you may not see flange connections when the pipe diameter is small and the pressure is low. However, in boiler rooms or production sites, flange connections are prevalent among pipelines and equipment.

According to the type of connection, flange connections can be categorized as: flat welding flanges, socket welding flanges, lap joint flanges, blind flanges, threaded flanges, flange covers, loose fit socket flanges with neck and lap joint, flat face loose fit flanges, ring groove flanges and flange covers, large diameter flat flanges, large diameter high neck flanges, winged blind flanges, and loose fit socket flanges with welding ring, etc.