Remaining Life Evaluation and Maintenance of Service-Exposed HP-Nb Reformer Tubes


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This paper is aimed at investigating the damage and remaining life of a whole HP-Nb hydrogen reformer tube serviced for 12 years. The damage and remaining life evaluation of different parts of the tube were made using metallographic examination, ambient and high temperature uniaxial tensile tests, creep rupture tests and damage mechanics analysis. The results showed that different parts of the tube have the different damage and remaining life due to different service temperature, higher the service temperature, severer the damage and shorter the remaining life. Based on these research results, a case of local maintenance of the reformer tube was introduced.



Key Engineering Materials (Volumes 324-325)

Edited by:

M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz




Y. Jiang et al., "Remaining Life Evaluation and Maintenance of Service-Exposed HP-Nb Reformer Tubes ", Key Engineering Materials, Vols. 324-325, pp. 407-410, 2006

Online since:

November 2006




[1] American Petrochemical Institute. Calculation of heater-tube thickness in petroleum refineries, API recommended practice 530. 3rd ed. Washington (DC), API (1983).

[2] Ray.A. K, Sinha.S. K, Tiwari.Y. N, Swaminathan. J, Das. G, Chaudhuri. S and Singh. R: Analysis of Failed Reformer Tubes. Eng. Failure Anal. Vol. 10 (2003), p.351.


[3] Konosu. S, Koshimizu. T, Iijima. T, Maeda. K: Evaluation of creep-fatigue damage interaction in HK40 alloy, Journal of Mechanical Design, Trans. ASME 1993. Vol. 115, p.41.


[4] Shipley.D. G: Creep damage in reformer tubes. Int.J. Press. Ves. and Piping. Vol. 14 (1983), p.21.

[5] Kaya. A. A: Microstructure of HK40 alloy after high-temperature service in oxidizing /carburizing environment. Materials Characterization. Vol. 49 (2002), p.23.


[6] Brear.J. M, Church.J. M, Hurphrey.D. R and Zanjani.M. S: Life assessment of steam reformer radiant catalyst tubes - the use of damage front propagation methods. Inter. J. Press. Ves. and Piping. Vol. 78 (2001).