Flange connections involve securing two pipes, fittings, or equipment to separate flange plates first, then placing a flange gasket between the two plates and tightening them together with bolts to complete the connection. Some fittings and equipment come with a flange plate already attached, which also falls under flange connections. Flange connections are an important 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.

Flange connections can be categorized by type of connection as: flat welding flanges, necked welding flanges, necked butt welding flanges, socket welding flanges, threaded flanges, flange covers, necked butt welding ring loose flanges, flat welding ring loose flanges, ring groove flanges and flange covers, large diameter flat flanges, large diameter high-neck flanges, blind flanges with bevel ends, and socket welding ring loose flanges, etc.