天津市自来水集团对两条已运行20年的大口径水源管道补加了阴极保护,采用了深井阳极技术,阳极井深达120m,解决了气阻和干扰问题,全线达到保护电位,延长了管道的使用寿命,节约了大量资金。本文介绍了此类型管道的保护电流密度选取、深井阳极形式,绝缘处理方式及干扰解决办法。 Tianjin Water Supply Group supplemented cathodic protection to two large-diameter water supply pipelines that have been in operation for 20 years. The deep well anode technology was adopted. The anode well reached a depth of 120m, which solved the gas resistance and interference problems, reached the protection potential across the pipeline and prolonged the pipeline’s Life, save a lot of money. This paper introduces the selection of the protection current density of this type of pipeline, the form of deep well anode, the insulation treatment method and the interference solution.