Flange connections involve securing two pipes, fittings, or equipment to separate flange disks first, then inserting a flange gasket between them and tightening them together with bolts, thereby completing the connection. Some fittings and equipment come with their own flange disks, which also fall under flange connections. Flange connections are a crucial method in pipeline construction. They are convenient to use and can withstand high pressure. In industrial pipelines and residential settings, you might 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 everywhere on pipes and equipment.

According to the type of connection, flange connections can be categorized as: flat welding flanges, socket welding flanges, slip-on flanges, threaded flanges, blind flanges, ring-type joint flanges, loose-tightened ring flanges, flat ring loose-tightened flanges, ring groove flanges, and large diameter flat flanges, large diameter long-neck flanges, L-shaped blind flanges, and slip-on ring flanges, etc.