Flange connections involve securing two pipes, fittings, or equipment to separate flange plates first, then placing a flange gasket between them 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 a crucial method in pipeline construction. They are convenient to use and can withstand high pressure. In industrial pipelines and residential settings, you often don't see flange connections, especially when the pipe diameter is small and the pressure is low. However, in boiler rooms or production sites, flanged pipelines and equipment are everywhere.

Flanged connections can be categorized by their connection methods, including: 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 covers, large diameter flat flanges, large diameter high-neck flanges, L-shaped blind flanges, and socket welding loose fit flanges.