A flange connection involves securing two pipes, fittings, or equipment to a flange plate. Flange gaskets are then placed between the two flanges and bolted together to complete the connection. Some pipe fittings and equipment already have built-in flanges, which also constitute flange connections. Flange connections are a key connection method in pipeline construction. They are convenient to use and can withstand high pressures. In industrial and household piping, where pipes are small in diameter and operate at low pressure, flange connections are often invisible. However, in a boiler room or production site, flanged pipes and equipment are everywhere.
Based on the connection method, flange connections can be categorized as follows: plate-type slip-on flanges, slip-on flanges with necks, butt-weld flanges with necks, socket-weld flanges, threaded flanges, flange covers, butt-weld lap flanges with necks, slip-on lap flanges, grooved flanges and flange covers, large-diameter flat flanges, large-diameter high-neck flanges, splayed blind flanges, butt-weld lap flanges, etc.