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城市管道地下环境复杂,拟采用牺牲阳极法对一条城市在役管道主线实施阴极保护,采用变频选频法和分段馈电试验法获得了管道的保护电流密度等重要参数,并探讨分析了影响城市旧煤气管道保护电流密度设计的某些因素。最终方案中阴极电流密度分别为0.65～1.00mA/m2(武汉市中北路),1.50～3.00mA/m2(武汉市徐东路),2.50～3.00mA/m2(武汉市团结路至团结一路),影响电流密度的因素有管线腐蚀状况、土壤腐蚀性及阀门井数量。该方案成功地实施于工程中。
The underground environment of urban pipeline is complex. It is proposed that the sacrificial anode method be used to implement cathodic protection on the main pipeline of a city in service. The key parameters such as the protection current density of the pipeline are obtained by the method of frequency conversion and frequency division, and the influences are analyzed Some Factors for Designing Current Density of Urban Old Gas Pipelines. The cathode current densities in the final protocol are respectively 0.65-1.00mA / m2 (Wuhan Zhongbei Road), 1.50-3.00mA / m2 (Wuhan Xu Road), 2.50-3.00mA / m2 (Wuhan United Road to United Road) Factors that affect the current density are pipeline corrosion, soil erosion and the number of valve wells. The program successfully implemented in the project.