Insulated joint use: buried steel oil, gas and water pipes often damaged due to corrosion, not only reduces life expectancy, can also cause serious accidents. Prevent corrosion of buried pipeline cathodic protection is to take effective measures to technology. In cathodic protection engineering, the request was to protect pipes and connected to certain devices, equipment, cut off the electrical connection between the slip road to avoid the loss to the cathode current protection does not require the protection of connected components. To ensure the success of cathodic protection technology. 
 Insulating flange purposes: is both a buried steel pipe required sealing performance and electrical corrosion protection works required by the electrical insulation of the pipe flange connection collectively. It includes a pair of steel flanges, insulating seal between two flanges, flange insulation parts and fasteners and fasteners with two flanges have been welded with a pair of short steel tube.