Fault Tree Analysis of Submarine Pipeline Corrosion Factors

The submarine pipelines are vulnerable to physical factors, chemical factors and biological factors, and then lead to corrosion. The destruction of the submarine pipelines is larger and more difficult to repair than land-based pipelines. This paper focuses on the analysis of influence factors of corrosion in sea mud, internal corrosion in pipelines, seawater corrosion, atmospheric corrosion, and other corrosion. With the corrosion failure of submarine pipelines as top event, the fault tree has been established. Through systematically qualitative analysis of the corrosion factors and structural importance, the conclusion was reached on how the above five kinds of corrosion and status of anti-corrosive coating affect the degree of submarine pipeline corrosion failure. Finally, the main influence factors of the submarine pipeline corrosion failure are determined, and so the correlative solving measures of the main influence factors are proposed in the article.