Flange connections involve securing two pipes, fittings, or equipment to separate flange discs first, then inserting a flange gasket between the two discs and fastening them together with bolts to complete the connection. Some fittings and equipment come with a built-in flange disc, 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, where pipe diameters are 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.

Flanged connections can be categorized by type of connection as: flat welding flange, socket welding flange, blind flange, threaded flange, cover flange, ring-type joint flange, loose ring flange, flat ring flange, groove face flange and cover flange, large diameter flat flange, large diameter long neck flange, winged blind flange, and loose ring socket welding flange, etc.