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- Title
Corrosion of CK10 Steel Pipes Used at the Entrance of Water and Gas Condensate Separation Unit from Natural Gas.
- Authors
Jafari, R.; Mohammadzadeh, H.; Gheysvand, A.
- Abstract
In the present work, the causes of failure have been investigated for a steel pipe that was abandoned after some time of service in a separation unit of gas facilities. These pipes are exposed to the natural gas and industrial atmosphere. Therefore, the damage to the steel pipes of the separation unit was investigated through several comprehensive analytical investigations, including an optical microscope (OM), quantometer, XRD, FE-SEM, EDS, and microhardness. Moreover, the corrosion resistance was studied through polarization and EIS analysis to elucidate the most plausible reactions and corrosion mechanisms. Visual observations indicated a significant reduction in the thickness of the pipes, and the metallographic studies showed exacerbated voids and porosities in the inner surface. Further studies proved severe uniform corrosion associated with pitting in the pipe's inner side and the removal of corrosion products by the gas flow, which confirmed the EIS results. According to the EDS and XRD results, the composition of the corrosion products was found to be Fe2O3, Fe3O4, and FeCO3. However, the porous and loose corrosion products presented an unprotective layer over the material. Based on the features of the material and the oil site conditions, some recommendations were proposed to reduce the corrosion rate, and prolong the service life of the pipes in the separation unit.
- Subjects
NATURAL gas; SEPARATION of gases; STEEL corrosion; WATER use; INDUSTRIAL gases; PIPE; STEEL pipe
- Publication
Journal of Failure Analysis & Prevention, 2024, Vol 24, Issue 1, p245
- ISSN
1547-7029
- Publication type
Article
- DOI
10.1007/s11668-023-01829-y