PSI - Issue 68

Reza Khadem Hosseini et al. / Procedia Structural Integrity 68 (2025) 409–414 R. K. Hosseini / Structural Integrity Procedia 00 (2025) 000–000

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4. Conclusion Research presented in this paper was concerned with root cause failure analysis of two furnace tubes from the CCR unit of an oil refinery. Based on the microstructural observations, being at temperature ranges of phase transformation of steels is probable. The results of micro-hardness up to 325 HV, strengthen the possibility of ferrite to bainite transformations. Carburization and, metal dusting according to the morphology of the surface round cavities and evidence of carburized layers in the tube wall's sections are two active mechanisms in the destruction of these tubes. It seems that the area welded to the tube has acted like a fin and caused the heat to be concentrated in the local parts of the tube.

Acknowledgements This work was financially supported by the Research Institute of Petroleum Industry (RIPI). References

Brear, J.M. and Williamson, J., 2007. Integrity and life assessment of catalytic reformer units. EUROPEAN FEDERATION OF CORROSION PUBLICATIONS, 42, p.18. Franks, A.R., Bagnall, S.L., Brear, J.M., Williamson, J., Conlin, P. and Reid, G., 2017. Carburization and metal dusting in fired heaters and steam methane reformers: plant integrity issues. In Proc. AWS conf. Materials performance and welding technologies, NACE (Vol. 1). Grabke, H.J., 1995. Metal dusting of low-and high-alloy steels. Corrosion, 51(9), pp.711-720. Hosseini, R.K., 2018. Root cause failure analysis of superheated steam tube at a petrochemical plant. Procedia Structural Integrity, 13, pp.232-237. Hosseini, R.K. and Yareiee, S., 2019. Failure analysis of boiler tube at a petrochemical plant. Engineering failure analysis, 106, p.104146. Hucińska, J. and Gajowiec, G., 2010. Assessment of fitness for service of Cr-Mo steel tubes in catalytic reforming charge heaters. Advances in Materials Science, 10(3), pp.17-26. Khadem Hosseini, R., 2022. A reliability study of API 530 for predicting creep life of long-service exposed 9Cr-1Mo steel tubes. Materials at High Temperatures, 39(6), pp.590-595. Orlikowski, J., Jazdzewska, A., Darowicki, K., Karczewski, J. and Dampc, J., 2018. Metal dusting phenomena of 501 AISI furnace tubes in refinery fractional distillation unit. Engineering Failure Analysis, 91, pp.108-114. Polovina, S., Vojtech, M., Dejanovic, I., Grujic, A. and Stijepović, M., 2018. Modeling a reaction section of a commercial continuous catalytic reformer. Energy & fuels, 32(5), pp.6378-6396. Wang, Y., Cheng, G., Hu, H. and Wu, W., 2012. Development of a risk-based maintenance strategy using FMEA for a continuous catalytic reforming plant. Journal of Loss Prevention in the Process Industries, 25(6), pp.958-965. Zare, A. and Hosseini, R.K., 2024. A breakthrough in creep lifetime prediction: Leveraging machine learning and service data. Scripta Materialia, 245, p.116037.