Abstract
This chapter presents a discussion of Cathodic Protection (CP) systems and their design. It begins with an introduction to corrosion fundamentals and CP principles. Cathodic protection is a thermodynamic means of controlling the rate of corrosion and can be applied either by electrically coupling the metal to more reactive metal that corrodes, or through the application of an impressed or rectified direct current. The chapter presents the design of galvanic systems and includes ground bed design and the algorithm for overall galvanic CP system design. It describes the design procedure for impressed CP. The chapter also presents the equations describing the attenuation of electrical potential along long buried structures, such as pipelines, and current demand equations for impressed CP systems. The application of these equations is presented as a methodology to determine the numbers of ground beds and their placement for CP of pipeline systems. The major problem associated with CP systems, stray current corrosion, is also discussed.
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