Flange connections involve securing two pipes, fittings, or equipment to each side of a flange, inserting a flange gasket between them, and then tightening them together with bolts, thereby completing the connection. Some fittings and equipment come with a built-in flange, which also falls 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, where the pipe diameter is small and the pressure is low, flange connections are not visible. However, in boiler rooms or production sites, you'll find flange connections on pipes and equipment everywhere.

The types of flange connections, categorized by their connection methods, include: flat welding flanges, socket welding flanges, blind flanges, threaded flanges, flange covers, loose fit ring socket welding flanges, flat ring socket welding flanges, ring groove flanges and flange covers, large diameter flat flanges, large diameter high-neck flanges, L-shaped blank flanges, socket welding ring loose fit flanges, and others.