Flange connections involve securing two pipes, fittings, or equipment to individual flange discs first, then inserting a flange gasket between the two flange discs and bolting them together to complete the connection. Some fittings and equipment come with a built-in flange disc, 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, you might 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-connected pipes and equipment everywhere.

Flanged connections can be categorized by their connection methods, including: flat welding flange, welding neck flange, socket welding flange, lug welding flange, threaded flange, flange cover, welding neck ring-type joint flange, flat ring-type joint flange, ring groove flange and flange cover, large diameter flat flange, large diameter high neck flange, winged blind flange, socket welding ring-type joint flange, etc.