Failure analysis and fitness-for-service assessment for a pipeline

✍ Scribed by Feng Yaorong; Li Helin; Zhang Pingsheng; Du Baiping; Ma Baodian; Jin Zhihao

• Book ID: 104383333
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 911 KB
• Volume: 8
• Category: Article
• ISSN: 1350-6307
• DOI: 10.1016/s1350-6307(00)00022-4

✦ Synopsis

Failures during hydrotest have been analyzed for a new crude oil pipeline, indicating that the main cause of failures is severe lack of fusion defects formed by inadequate welding heat input in electric resistance welded (ERW) pipe welds. The ®tness-for-service (FFS) assessment has been carried out for the pipeline by use of the fracture mechanics approach, which shows that the pipeline may leak before break under designed operating pressure, and the lack of fusion defects in the welds may propagate under the condition of ¯uctuating pressure. The prediction of remaining life for the pipeline is given in this paper.