Abstract
Abstract : This report summarizes the results of a study undertaken to provide an in-depth evaluation of four principal cathodic protection (CP) criteria used for underground and underwater metallic structures. All of the criteria considered make use of structure-to-soil potential measurements. The intent of the report is to provide the background necessary for selecting the proper criterion for a given situation and to remove the misconceptions which often arise. Guidance is provided for correct placement of the reference electrode with respect to the structure being investigated, and for determining how many potential measurements are sufficient. Explanations are given concerning the various voltage (IR) drops which are encountered and instruction is given on how those IR drops are to be considered. It must be understood that there are too many variables to allow for general, all-inclusive statements regarding criteria for cathodic protection. Each application must be reviewed individually using the experience from other similar applications together with the information in this report.
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