Study on pipeline interference from stray current of DC

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					   Study on pipeline interference from stray current of DC light railway


                                  Changfang Wu
                         E-mail: cfwu@petrochina.com.cn
                  R&D Center of PetroChina Pipeline Company
          Corrosion & Protection Technoloogy Research Institude
            physical addresses:         51#    Jingguang Road   Langfang
                              Hebei    06500    P.R.China
                                Tel:    86-316 2170727




                                       ABSTRACT

The stray current interference may cause pipeline corrosion and environment
pollution, even affects safe production and reduces pipeline service life. This paper
describes the results of a systematic field investigation of the stray current
interference from DC Light railway. To mitigate the stray current interference,
drainage by grounding technique and cathodic protection unit     have been adopted.
So far, the stray current effects were greatly reduced.
Keywords: buried pipeline; DC stray current; interference; cathodic protection;
drainage by grounding