Flange connections involve securing two pipes, fittings, or equipment to separate flange plates, inserting a flange gasket between them, and then 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 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 the pressure is low, flange connections are not visible. However, in boiler rooms or production sites, you'll find flange-connected pipes and equipment everywhere.

The types of flange connections, categorized by their connection methods, include: flat welding flanges, socket welding flanges, blind flanges, threaded flanges, flange covers, loose fit socket welding flanges with neck, flat welding loose fit flanges, ring groove flanges, and flange covers, large diameter flat flanges, large diameter high-neck flanges, winged blind flanges, and socket welding loose fit flanges.