Flange connections involve fixing two pipes, fittings, or equipment to separate flange disks first, then inserting a flange gasket between the disks and securing them together with bolts, thus completing the connection. Some fittings and equipment come with a flange disk already attached, which also falls under flange connections. Flange connections are an essential method in 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, you'll find flange connections on pipes and equipment everywhere.

Flange connections can be categorized by their connection methods, including: flat welding flanges, socket welding flanges, blind flanges, threaded flanges, flange covers, loose fit flanges with socket welding rings, loose fit flanges with flat welding rings, ring groove flanges and flange covers, large diameter flat flanges, large diameter high-neck flanges, winged blind flanges, and loose fit flanges with welding rings, etc.