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

According to the type of connection, flange connections can be categorized 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 a letter "V" shape, and socket welding ring loose flanges, etc.