Problems and Suggestions in the Resistivity Measurement of the External Anti-Corrosion Coating of Buried Steel Pipelines

The resistivity of the anti-corrosion coating of buried steel pipeline is an important parameter.In recent years，the value of this parameter has been used to evaluate the overall quality of the anti-corrosion coating of in-service or directional drilling pipelines.All the domestic standards regarding the on-site measurement of this parameter and the evaluation of the overall quality of the anti-corrosion coating are established with reference to NACE TM 0102-2002.However，those domestic standards have not explained the concept of "anti-corrosion coating resistivity" clearly and there is confusion with terms related to "anti-corrosion coating resistivity".The reasons for selecting the general method and the attenuation method are not defined clearly for the measurement of the resistivity of anti-corrosion coating in various standards，and the test location of the soil resistance is not specified when the general method is used for the directional drilling crossing pipeline，resulting in differences in the field t