Study on the Evaluation and Protection Scheme for the Interference of Subway Stray Currents on a Finished Oil Pipeline in South China
Since Dongguan Metro was put into operation,pipe-to-soil potential of the pipeline fluctuated frequently and significantly from the Zhangcun valve chamber to the No.54 test pile of a product oil pipeline in South China.The cathodic protection potential at some positions did not meet the standard requirements.Accurately evaluating the risk of subway stray current interference and taking effective protective measures have become an urgent need in actual production.In this study,the DC stray current interference test data and interference risk assessment re-sults of a product oil pipeline in South China were introduced.Results showed that the off-potential at 61％of the test points did not meet the standard requirements.By comparing the mitigation effects of three schemes:self-cathodic protection system tuning,insulating joint bypass at entry and exit station,and forced current drainage,it was ultimately determined that forced current drainage was the optimal mitigation solution.
万方数据
维普
