Flange connections involve securing two pipes, fittings, or equipment to each side of a flange disk, inserting a flange gasket between them, and then fastening them together with bolts, thus completing the connection. Some fittings and equipment come with a flange disk pre-installed, which also falls under the category of 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 pipe diameters are small and pressures are low, flange connections are often not visible. However, in boiler rooms or production facilities, you'll find flange connections on pipes and equipment everywhere.

Flanged connections can be categorized by their connection methods as: flat welding flanges, socket welding flanges, slip-on flanges, threaded flanges, blind flanges, ring-type joint flanges, slip-on ring flanges, flat ring flanges, groove face flanges, and blind flanges, large diameter flat flanges, large diameter long-neck flanges, winged blind flanges, and slip-on ring flanges for welding.