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库鄯输油管道沿线不同的地形地貌和土壤分布造成对管道腐蚀性的差异。埋地管道表面在不同部位间存在的电位差是引起金属表面土壤腐蚀的主要原因。介绍了沿线土壤腐蚀环境及库鄯输油管道阴极保护系统的设计、施工及调试情况。阴极保护系统采用强制电流和牺牲阳极两种保护形式。在高电阻率的石方段采用伴随管道同沟敷设的柔性辅助阳极;在山区段采用带状和块状的镁阳极做牺牲阳极。该系统调试运行正常,应用效果良好。由于近年来的输油管道趋向于采用性能优良的防腐层,在进行阴极保护设计时,提出对防腐层面电阻和最高保护电位等参数的取值应通过试验进行测定。同时由于大部分地段土壤含盐率较高,在雨季应加强对管道保护电位的测试。
The different topography and distribution of soil along the pipeline of 鄯 造 pipeline caused the difference of pipeline corrosion. The potential difference of the surface of buried pipeline between different parts is the main reason that causes the corrosion of metal surface soil. The paper introduces the soil erosion environment and the design, construction and commissioning of the cathodic protection system of the reservoir pipeline along the route. Cathodic protection system uses forced current and sacrificial anode two forms of protection. In the high resistivity of the stone section with the same channel with the laying of supple auxiliary flexible anode; in the mountain section with strip and block magnesium anode sacrificial anode. The system debugging is running properly, the application effect is good. As oil pipelines in recent years tend to adopt high performance anticorrosive coatings, during the design of the cathodic protection, the parameters such as the surface resistance of the anticorrosive coating and the maximum protective potential should be determined through experiments. At the same time, because of the high salt content of soil in most areas, the test of pipeline protection potential should be strengthened during the rainy season.