Detection and protection of stray current interference of Rizhao-Dongming Oil Pipeline

The Rizhao-Dongming Oil Pipeline runs parallel and crossing with high tension lines and crossing with electrified railway at many locations, so a greater risk of stray current interference corrosion exists. The SCM stray current tester is used to detect Rizhao-Dongming Oil Pipeline. The results show that the stray current caused by high tension line produces a very big interference on pipeline. Given the same angle between high tension line and pipeline and the same high voltage line output voltage, the high tension line has reduced impact on pipeline with the rise of the distance between the high tension line and the pipeline. Moreover, big stray current interference exists at the crossing of pipeline with electrified railway. In this regard, pipeline laying should keep away from or keep a safe distance with high tension line and electrified railway. This paper discusses the advantages and disadvantages of different drainage protection methods, and proposes the combination of polarity drainage and negative potential drainage. It is pointed out that proper drainage method should be selected for each pipeline according to the actual situation.