Abstract
Economic efficiency in using the solar panels as the DC sources for the impressed current cathodic protection of offshore structures was compared with the sacrificial anode cathodic protection. The calculation was based on the example of a sheet pile wall with a surface area of 2000 m2 protected by various methods of cathodic protection: the impressed current cathodic protection powered by a rectifier device, by solar panels with batteries, by solar panels without batteries and sacrificial anode cathodic protection. The results showed that the cost of impressed current cathodic protection powered by solar panels without batteries is the lowest after 10 years of operation. Cathodic protection powered only by solar panels without batteries is the most beneficial in cold climates when battery life is reduced, and for facilities that are remote from centralized power sources, where the power supplying cost to the protected structure is difficult to estimate due to specific situations.
Highlights
The most effective protection method of marine metal structures is electrochemical protection [1, 2]
Solar panels are such a reliable DC source with a service life of more than 25 years. They have one significant drawback - they do not generate electricity at night, and for the continuity of the cathodic protection operation, a cathodic protection system must include batteries that have a significantly shorter service life compared to solar panels and require periodic replacement and maintenance
Cathodic protection of offshore structures is accompanied by the formation of calcareous deposits on the metal surface [3,4,5,6], which have a protective ability [7, 8]
Summary
The most effective protection method of marine metal structures is electrochemical protection [1, 2]. The question often arises about the advisability of using autonomous DC sources Solar panels are such a reliable DC source with a service life of more than 25 years. Cathodic protection of offshore structures is accompanied by the formation of calcareous deposits on the metal surface [3,4,5,6], which have a protective ability [7, 8] This protective feature allows the cathodic protection current to be disconnected for a certain period, for example, for repair or replacement of anodes. It was shown that cathodic protection powered only by solar panels without batteries has sufficient protection at current densities over 200 mA/m2 [9, 10] This kind of protection can combine with the other traditional protection methods to have better efficiency. The purpose of this work is the comparative economic efficiency of the different realization methods of cathodic protection for offshore structures
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