Flange connections involve securing two pipes, fittings, or equipment to separate flange discs first, then inserting a flange gasket between the two discs and fastening them together with bolts to complete the connection. Some fittings and equipment come with a flange disc already attached, which also falls under flange connections. Flange connections are an essential method of pipe construction. They are convenient to use and can withstand high pressure. In industrial pipelines and residential settings, you may not see flange connections when the pipe diameter is small and the pressure is low. However, in boiler rooms or production sites, flange connections are prevalent throughout the pipelines and equipment.

Flanged connections can be categorized by type of connection as: flat welding flanges, socket welding flanges, slip-on flanges, threaded flanges, blind flanges, loose ring flanges, flat ring loose flanges, groove face flanges, large diameter flat flanges, large diameter long neck flanges, L-shaped blind flanges, and slip-on ring flanges, etc.