Abstract
Marine seawater pipelines can be manufactured from different materials that vary in their purchase costs and lifetimes,thus presenting a challenge when selecting proper materials for a particular project. To solve this problem,a life cycle cost model for marine seawater pipelines was developed after identifying key corrosion features of pipeline materials. An offshore oilfield ship was used as a case study to compare the differences in the life cycle costs of marine seawater pipelines made of plain-carbon steel,seamless galvanized steel,stainless steel,stainless galvanized steel,and copper-nickel alloy. It was found that the seamless galvanized steel pipeline was a robust and economic choice for marine seawater pipelines for the offshore oilfield ship. The results showed that the proposed life cycle cost model was efficient and could be used in the design phase of ships.
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