However, the amount of current required depends on the size of the uncovered area. For this reason, it is uneconomical to use cathodic protection alone as a means of controlling corrosion as extremely large currents are needed (Baker and Fessler 15). Therefore, coatings are usually utilized alongside cathodic protection (Baker and Fessler 15). Coatings act as barriers between steel and the electrolyte in preventing corrosion.

‘Pipe-in-pipe’ is another technique that prevents corrosion of pipelines. In this method, a pipe made of metal is inserted into another pipe that has insulating wadding on its inner surface. However, this technique is only suitable for short lengths of pipes as pipes may be costly.

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