Failure analysis and mechanical performance of an oil pipeline |
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Affiliation: | 1. Laboratory of Theoretical and Applied Mechanics, Graduate Program in Mechanical Engineering, Universidade Federal Fluminense, Rua Passo da Pátria 156, 24210-240, Niterói, RJ, Brazil;2. NRI — Neptune Research Inc., 3875 Fiscal Ct., Ste #100, Riviera Beach, FL 33404, USA;3. Research and Development Center — CENPES, Petróleo Brasileiro S.A. — PETROBRAS, Av. Horácio de Macedo 950, 21941-915, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, Brazil |
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Abstract: | This paper presents a work scheme for failure analysis of buried oil pipelines. The scheme provides answers for two main questions at least: what were the causes that made the system fail and why the system failed in the way it did. The scheme is based on five stages and the results of these stages are related to each other and consistent with the type of failure, thereby providing objective conclusions. The proposed scheme was successfully applied to a case of a buried oil pipeline whose failure was a result of external corrosion. We established the occurrence of accelerated corrosion characterized by two corrosion mechanisms: one involving iron oxides and the other, iron sulfides. Furthermore, the ductile type failure has proved to be due to leakage, which is consistent with the reported evidence. |
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Keywords: | Failure analysis Steel Corrosion Fracture Scanning Electron Microscopy |
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