Results of investigations on a working cathodic protection installation of two underground LPG tanks are presented. The efficiency of anodes and buried reference electrodes were evaluated using electrochemical impedance measurements. On the basis of the impedance spectra obtained it can be shown how one of the anodes attached to the long anode line works inefficiently. In addition, the potential distribution map for the protected tanks is presented. On the basis of this information, an electric connection was revealed from the tanks to the neighbouring reinforced concrete structures, this being inconsistent with the technical guidelines for the cathodic protection installation. The inspection performed on the installation yielded some recommendations concerning the operational parameters and the identification and replacement of defective components.
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Żakowski et al. (2004) studied this question.
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