Natural gas transmission pipeline is prone to internal corrosion due to the combination of corrosive impurities in the pipe (such as CO2, H2S and chlorides) and applied pressure of the pipeline, which seriously affects the safe operation of the pipeline. In this work, the corrosion behavior of a typical X70 pipeline steel was investigated by using potentiodynamic polarization and electrochemical impendence spectroscopy (EIS). The polarization and EIS data under different CO2 partial pressures (0–1 atm), H2S concentrations (0–150 ppm), chloride concentrations (0–3.5 wt%) and tensile stress (0–400 MPa) were obtained. The results show that corrosion rate increases with the increase of CO2 partial pressure and chloride concentration, respectively, while first increases and then decreases with the increase H2S concentrations. The corrosion rate is less affected by elastic tensile stress. In addition, a quantitative prediction model for corrosion rate of natural gas pipeline based on adaptive neuro-fuzzy inference system (ANFIS) was established by fitting the experimental data which maps the relationship between the key influencing factors (i.e. CO2 partial pressure, H2S concentration, chloride concentration and tensile stress) and the corrosion rate. The prediction results show that the relative percentage errors of the predicted and experimental values are relatively small. The prediction accuracy of the model satisfies the engineering application requirement.
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ASME 2017 Pressure Vessels and Piping Conference
July 16–20, 2017
Waikoloa, Hawaii, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5791-5
PROCEEDINGS PAPER
Corrosion Behavior of X70 Pipeline Steel and Corrosion Rate Prediction Under the Combination of Corrosive Medium and Applied Pressure
Kaikai Li,
Kaikai Li
Xi'an Jiaotong University, Xi'an, Shaanxi, China
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Wei Wu,
Wei Wu
Xi'an Jiaotong University, Xi'an, Shaanxi, China
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Guangxu Cheng,
Guangxu Cheng
Xi'an Jiaotong University, Xi'an, Shaanxi, China
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Yun Li,
Yun Li
Xi'an Jiaotong University, Xi'an, Shaanxi, China
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Haijun Hu,
Haijun Hu
Xi'an Jiaotong University, Xi'an, Shaanxi, China
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Hao Zhang
Hao Zhang
Xi'an Jiaotong University, Xi'an, Shaanxi, China
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Kaikai Li
Xi'an Jiaotong University, Xi'an, Shaanxi, China
Wei Wu
Xi'an Jiaotong University, Xi'an, Shaanxi, China
Guangxu Cheng
Xi'an Jiaotong University, Xi'an, Shaanxi, China
Yun Li
Xi'an Jiaotong University, Xi'an, Shaanxi, China
Haijun Hu
Xi'an Jiaotong University, Xi'an, Shaanxi, China
Hao Zhang
Xi'an Jiaotong University, Xi'an, Shaanxi, China
Paper No:
PVP2017-65651, V01BT01A036; 6 pages
Published Online:
October 26, 2017
Citation
Li, K, Wu, W, Cheng, G, Li, Y, Hu, H, & Zhang, H. "Corrosion Behavior of X70 Pipeline Steel and Corrosion Rate Prediction Under the Combination of Corrosive Medium and Applied Pressure." Proceedings of the ASME 2017 Pressure Vessels and Piping Conference. Volume 1B: Codes and Standards. Waikoloa, Hawaii, USA. July 16–20, 2017. V01BT01A036. ASME. https://doi.org/10.1115/PVP2017-65651
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