The Use Of Sacrificial Anode Protection Technology

Before Changzhou city gas medium pressure pipe network mainly uses cast iron pipe, the connection way is the flexible mechanical interface, the use of steel pipe project is few. However, with the development of gas users and the improvement of pipe network pressure, considering the introduction and transition of natural gas in the future, steel pipes are more and more widely used. With cast iron to reduce site construction difficulties; Due to the advantages of high seismic and compressive performance of welded U, we used buried steel pipes in the new small pressure pipe network on Changxi Road and North Chengzhong Road. However, IN THE RECONSTRUCTION PROJECT OF HUIDE BRIDGE IN OUR CITY, SOME STEEL PIPES WHICH HAVE BEEN LAID FOR MORE THAN TEN YEARS HAVE been EXCAVATED, although there is still residual ANTI-corrosion insulation layer on the surface of the steel pipes. However, there are pits on the surface of the steel pipe because the sacrificial anode protection technology is not implemented. According to these conditions, the damage of anticorrosive insulation layer on the outer wall of buried steel pipe is the main reason of soil corrosion. The damage of the insulation layer is often inevitable in the process of construction and maintenance. Once the damage of the insulation layer occurs, corrosion will be carried out violently in the damaged part. In order to prolong the service life and obtain good economic benefits, we decide to use the method of sacrificing anode protection and epoxy coal asphalt anticorROsive insulating layer protection to achieve the purpose of anticorrosion. Compared with the pipe, the steel pipe has high compressive strength; For pre-machined long pipe segments.