Internal Corrosion Rupture of a 6-in Gas Line

Conclusions * The gas pipe failure was due to the wall thinning caused by severe internal corrosion. * The presence of traces of H2S and CO., in wet conditions were responsible for the corrosiveness of the fluid. * Dissolved H2S and CO,, in wet conditions formed corrosive acids and reduced the pH. *...

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Bibliographic Details
Published inMaterials Performance Vol. 51; no. 5; pp. 70 - 73
Main Authors Elhoud, A, Jewilli, F, Abouswa, K, Rageai, O
Format Magazine Article Trade Publication Article
LanguageEnglish
Published Houston NACE International 01.05.2012
Subjects
Carbon dioxide
Corrosion
Corrosion rate
Corrosion tests
Crack propagation
Failure analysis
Fluid dynamics
Fluid flow
Fluids
Pipe
Scanning electron microscopy
Shear strength
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Summary:Conclusions * The gas pipe failure was due to the wall thinning caused by severe internal corrosion. * The presence of traces of H2S and CO., in wet conditions were responsible for the corrosiveness of the fluid. * Dissolved H2S and CO,, in wet conditions formed corrosive acids and reduced the pH. * The calculated corrosion rate revealed that the pipe had exceeded the corrosion allowance and the minimum required thickness in less time than the design life. Recommendations The end user of such pipes in similar operating conditions can use the following recommendations to mitigate this kind of degradation: * Prevent any sort of internal wetness to avoid internal corrosion. * Conduct a field survey of fluid chemical analysis, pH measurements, and the pipe thickness measurements to ensure the desired lifetime of the pipe. * Upgrade the pipe material to highly corrosion-resistant alloys to mitigate the corrosion risk.
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ISSN:0094-1492