By measuring the resistance to electric current spreading into the ground from large-sized terminals as an example, we have presented our results when analyzing the possibility to perform measurements for various electrodes installation designs in field conditions. Specific features of performing work during the inspection of the existing on-site facilities of main oil and oil product pipelines we have described. Including taking into account the shape of large-area grounding devices, their location in close areas with various terrain features, in the presence of long pipelines, communication lines (CLs), power transmission lines (PTLs), forests, etc. For certain cases, e.g., for terminals of facilities with a size of about 100 m, that are located on loams, we have justified the parameters of a two-beam design for measuring the spreading resistance, which ensures the required measurement accuracy and the inspection efficiency in field conditions. Our theoretical assessment of the nature of changes in the measured ground resistance at different distances between the grounding terminal’s support point and the measuring electrodes qualitatively coincides with the results obtained in field conditions. We have described the cases that exemplify the possibility of expanding the application scope of the results obtained to facilities located in areas with a rugged topography. We have also demonstrated that the basic ratios between the distances, at which it is advisable to install the electrodes in case of a double-beam measurement design, can also be used under certain conditions when inspecting the state of grounding systems of main oil and oil product pipelines facilities with overall dimensions of several hundred meters.
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