The use of a polymeric liner onto the inner surface of a steel pipe is an effective way to prevent metal corrosion. The stability of the polymeric liner is crucial for the safety and life of the lined steel pipes. In this work, the aging of the polyethylene of raised temperature resistance (PE-RT) pipe liner after a four-year service in a crude oil gathering system was investigated. The pipe liner was characterized by SEM, durometer, densitometer, tensile testing, FTIR, TGA, DSC, and XRD. The results indicate that the PE-RT pipe liner was swelled by the conveying medium, resulting in the rough surface, higher density, decreased hardness, lower thermal stability, and lower thermal dimensional stability. More importantly, the swelling caused a decrease of crystallinity and orientation. Accordingly, the mechanical properties, including yield strength and modulus, decreased. Based on the above results, aging caused by swelling can be confirmed to occur during its service in the crude oil gathering system, resulting in performance degradation.
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This research was funded by the Xi’an Science and Technology Association Youth Talent Promo-tion Project funding [grant number 095920201321] and China National Petroleum Corporation Basic Research and Strategic Reserve Technology Research Fund Project [grant number 2019D-5008 (2019Z-01) and 2020D-5008(2020Z-05)].
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Kong, L., Qi, D., Li, H. et al. Aging of Polyethylene of Raised Temperature Resistance Pipe Liner After a Four-Year Service in a Crude Oil Gathering System. J Fail. Anal. and Preven. 21, 1323–1330 (2021). https://doi.org/10.1007/s11668-021-01176-w
- Crude oil
- Pipe liner
- Performance degradation