Interference can significantly affect the performance of Cathodic Protection (CP) systems designed to protect structures from corrosion. Problems can occur when structures are in close proximity and electrically connected to each other. Even if the individual CP systems are well designed, interference can degrade the performance of the anodes as the current will take the path of least resistance which can result in accelerated depletion of some of the anodes. In some cases, the problem of interference may not become apparent until later in the life of the structure when the current demand increases due to degradation of the coatings. Therefore the integrity may be at risk due to poor protection of parts of the structure and it can lead to urgent unplanned retrofits.
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