Analysis on Causes of Corrosion in the Sleeve Joint of Certain Offshore Pipeline System

Hong Wang; Xian He Liu

doi:10.4028/www.scientific.net/AMR.1088.697

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Analysis on Causes of Corrosion in the Sleeve Joint of Certain Offshore Pipeline System

Abstract:

Leakage was found in certain oilfield offshore pipeline system and investigation results showed that the cause of the leak was corrosion perforation in the sleeve joints of pipeline system. In order to avoid the leak occurring again, it was necessary to analyze corrosion mechanism of the sleeve joints. Macro and micro analyze, test on physical and chemical properties and microstructure, XRD analysis on corrosion products was accomplished on the sleeve joints. Results obtained from analysis and test show that corrosion was stronger because there are some CO2 and H2S in the pipeline together. Corrosion perforation was brought by flow velocity suddenly increase and turbulent flow and flow field action.