东黄复线的阴极保护问题

Issues on the Cathodic Protection in Donghuang Second Pipeline

阴极保护系统对管道的防腐起着重要作用。分析了东黄复线阴极保护系统存在的问题。通过对东营出站段管道、丈岭站东段管道及潍坊段管道的阴极保护电位的检测及调查,指出阴极保护率下降的主要原因是:地下金属管道搭接点难以保证管道间允许的相对净空距离,施工时又未对管道交叉点做很好的绝缘处理,使防腐层逐渐破损;施工质量较差,使防腐层严重劣化;有些管段阴极保护站的电源采用太阳能电源与交流电同步,而交流电源一直得不到解决,使送电功率减小,阴极保护电位下降。针对以上问题,提出了改进措施。

The cathodic protection system plays an important role in the pipeline corrosion control. The paper analyzes the problems existing in the cathodic protection system of Donghuang second pipeline. By inspecting and invesatigating the cathodic protection potential of the outlet pipeline sections in Donghuang and Zhangling pump station as well as Weifang pipeline section ,the paper points out that the main causes of the insufficient cathodic protection for these sections include that the underground metal pipe joints can not ensure the relative space distance between pipes;the pipe joints have not been insulated perfectly during construction, which makes the protective coating damage gradually;the poor quality of construction makes the protective coating deteriorative severely; and the solar energy and AC power are used simutaneously in some cathodic protection stations along the pipeline,while the AC power is not available,which makes the power supply reduced and cathodic protection potential declined. Some suggestions are given in the light of the problems above mentioned.