Corrosion and protection of the W114 offshore platform after a 15-year service in Weizhou oil field of the South China
中国南海涠洲油田W114A 平台服役15 年的水下钢结构腐蚀防护调查

Corrosion and protection of the underwater steel structures for W114A platform were investigated. The offshore platform has been in service in the South China Sea for 15 years. It was found that the bio-fouling was serious and the maximum attachment thickness was 20cm, while, the cathodic protection system was normal and the protective effect was favorable. After analyzing the detective methods and their results, some problems were found. The program of potential detection was inappropriate, the detection method for physical size of the sacrificial anodes was inaccurate, and the base surface of the thickness measurement points was not clean; therefore, the cathodic protective effect could not be accuraely evaluated. To solve these problems, some valuable suggestions are put forward accordingly.