Effects of high-voltage power line on corrosion of buried steel pipeline

Basic data regarding AC interference of high-voltage power line(HVTL)on Zhongxian-Wuhan Gas Pipeline were obtained through field investigation. Firstly, the physical and chemical properties of field soils were analyzed, then, the lab simulation experiment on steel in typical soils was carried out in order to study the corrosion behavior and the effect of AC interference on the corrosion behavior. Finally, the cathodic protection effectiveness criterion of pipeline based on current density in AC interference environment was gained and confirmed by the field coupon test. In addition, an AC interference evaluation software was developed based on the above results and the calculation model, and used to evaluate the potential corrosion risk of those pipes located at AC interference region in this pipeline. The calculation results from this software were proved by the field measured results.