Interference analysis and research of parallel pipeline cathodic protection based on boundary element method
To address the problem brought by mutual interference of cathodic protection systems between parallel pipelines,a physical model of parallel pipelines is built by numerical simulation technology based on the boundary element method.The cathodic protection potential distribution and potential offset of interference pipelines under different factors are simulated.The Sobol algorithm is used to reveal the global sensitivity and interaction of influencing factors.Finally,according to the main control factors,a chart tool is formed to meet the requirements of interference protection.The results show that the simulated potential distribution is consistent with the measured potential distribution obtained by the potential data recorder,with a small relative error,meeting the engineering requirements.With the rise of soil resistivity and coating breakage rate,the near positive extreme potential will shift negatively,and the far one will shift positively.When the soil resistivity exceeds 50 Ω·m,there will be DC interference.With the increase of pipe spacing and auxiliary anode position,the near positive extreme potential will shift positively,and far one will shift negatively.There is a strong interaction between soil resistivity,corrosion protection layer failure rate,and pipeline spacing.The chart tool enables the fast compliance verification of the minimum parallel spacing of pipelines.
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