Abstract

This chapter outlines cathodic protection fundamentals, criteria, field data, and design aspects. A detailed description is given for monitoring methods such as potential survey, close interval potential survey, direct current voltage gradient, and corrosion rate measurement. Sacrificial protection system design illustrates total circuit resistance evaluation, anode output, number of anodes, and anode life. Impressed current systems (ICS) design is illustrated for a pipeline designed by the author and anode, rectifier, and ground bed selection is explained as well as rectifier output and service life. At the end of the chapter, a computer-aided cathodic protection design is addressed to illustrate troubleshooting existing structures, sacrificial and ICS design analysis, checking interference effects, attenuation, and system life prediction. Case studies and solved problems illustrate sacrificial and impressed current cathodic protection system design.

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