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| POTENTIAL AND CURRENT DISTRIBUTIONS ON PIPELINES CATHODICALLY PROTECTED WITH RIBBON SACRIFICIALANODES |
| QIU Feng XU Naixin (Shanghai Institute of Metallurgy; Chinese Academy of Sciences) |
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Abstract Buried steel pipeline could be protected by extruded ribbon sacrificial anodes instead of traditional cast ingot anodes. Since the continuous ribbon anodes are installed in trenches parallel to the pipeline, the potential distribution in axial direction is certainly uniform. In this study, the finite element method has been applied to calculate the potential distribution and current distribution along circular periphery of the pipe. A variety of factors that may influence these distributions have been examined. In general, these distributions are also considerably uniform. The lower the soil resistivity, the larger the cathodic polarization as well as the current required for protection. Protective coating is always favorable to cathodic protection. Piples of various diameters and with various distance between pipe and anode do not show significant differences. These results may be of some help to engineering. It is also indicated that the ribbon anodes are really ideal for cathodic protection of buried pipelines.
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Received: 25 April 1997
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1 中华人民共和国石油天然气行业标准.长输管道阴极保护工程施工及验收规范,SYJ4006-90
2 Dow Magnesium,Extruded Magnesium Anodes from Dow
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6 邱枫.中国科学院上海冶金研究所硕士论文,1995 |
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