This article describes two principal methods for detecting well casing corrosion, namely, metal-loss tools and casing current measurement, as well as their limitations and advantages. It discusses the factors to be considered in designing well casing cathodic protection systems. These include the determination of cathodic protection current by the casing polarization and CPP tests or by mathematical models; calculation of casing-to-anode separation; isolation of the casing from other facilities; consideration of stray current interference from other dc power sources; and determination of the size and the location of the anode bed for effective current output for the desired life of the anode bed. The article concludes with a discussion on the commissioning and monitoring of cathodic protection systems.

This article provides a detailed discussion on the various devices by which cathodic protection (CP) can be applied to pipe-type power transmission cables. These devices include the resistor rectifier, isolator-surge protector, polarization cells, and field rectifiers. The article describes the interference created by stray currents on CP and associated remedial actions.

Cathodic protection (CP) is an electrochemical means of corrosion control widely used in the marine environment. This article discusses two types of CP systems: impressed current systems and sacrificial anode (passive) systems. It describes the anode materials used in these systems and the CP criteria. The article examines the design considerations and procedures involved in the CP of marine pipelines, offshore structures, and ship hulls. An illustration of sacrificial anode calculation is also provided.

Cathodic protection is an electrochemical means of corrosion control in which the oxidation reaction in a galvanic cell is concentrated at the anode, which suppresses corrosion of the cathode in the same cell. This article provides a detailed discussion on the fundamentals and types of cathodic protection as well as their power sources and design considerations. The criteria for the cathodic protection and types of materials used in sacrificial anodes and impressed-current anodes are also discussed. The article provides examples selected for familiarizing the design engineer with the steps for selecting a specific corrosion control method.