Cathodic protection technology includes sacrificial anode and impressed current. Both methods have their own advantages and disadvantages. For the seawater circulating water system of a power plant, the specific choice of which method is often determined by factors such as the size of the required protection current, whether convenient input power can be obtained, whether it will cause danger, and the size of the equipment structure space. Generally, for small-diameter pipelines, the seawater flow rate and medium composition vary greatly, and a large protection current needs to be provided. It is more suitable to use impressed current cathodic protection. In recent years, the seawater circulating water system of the maintenance part of power plants has increasingly adopted impressed current cathodic protection. The circulating water system of the maintenance part is usually composed of pipelines (straight pipes, elbows and reducers, etc.), equipment (such as condensers, heat exchangers, filters, butterfly valves, etc.), with complex structures and multiple material connections. These make the cathodic protection of pipelines and equipment systems complicated. To comprehensively protect the system, scientific and reasonable design and good anti-corrosion construction must be carried out.
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