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Journal of Failure Analysis and Prevention

, Volume 19, Issue 2, pp 291–300 | Cite as

Failure Analysis of Incoloy 800HT and HP-Modified Alloy Materials in a Reformer

  • Chris MaharajEmail author
  • Andres Marquez
  • Riza Khan
Case History---Peer-Reviewed
  • 48 Downloads

Abstract

The main causes of creep failure in the pigtails and tubes made of high-temperature Incoloy 800HT and HP-modified alloy materials of two natural gas primary reformers operating at a petrochemical plant complex were studied. Optical emission spectroscopy, high-resolution optical microscopy, scanning electron microscopy, and energy-dispersive x-ray spectroscopy were performed to verify that creep was the prevailing failure mechanism in both cases. Creep was confirmed in both cases by the (massive) presence of intergranular voids (aligned in some cases) at the grain boundaries and cracks originating from the edge and longitudinal to the edge in some areas. Localized overheating due to burner flame impingement most likely accelerated the creep rate deformation for the HP-modified reformer tube material though the material surpassed its design life of 100,000 h. The findings substantiate that high priority should be placed on reformer burner management and ensuring the catalyst in the reformer tubes is packed optimally to avoid downstream flows issues in the outlet pigtails. These measures can serve to mitigate the effects of localized heating that can contribute to the failure of these components.

Keywords

Creep Failure analysis Reformer High-temperature alloys Localized overheating 

Notes

Acknowledgments

The authors would like to thank Ms. Janell C. Ramlal for her support in carrying out this study.

References

  1. 1.
    Special Metals Corporation. The Story of the “Incoloy Alloys Series,” from 800, through 800H, 800HT (2004), http://www.specialmetals.com/documents/Incoloy%20alloys%20800H%20800HT.pdf. Accessed 16 May 2017
  2. 2.
    C. Maharaj, C.A.C. Imbert, J. Dear, Failure analysis and creep remaining life of hydrogen reformer outlet pigtail tubes. Eng. Fail. Anal. 15, 1076–1087 (2008)CrossRefGoogle Scholar
  3. 3.
    ASTM International, in ASTM A297/A297 M-17 Standard Specification for Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application. Book of Standards Volume: 01.02 (ASTM International, West Conshohocken, 2017)Google Scholar
  4. 4.
    C.M. Schillmoller, in HP Modified Furnace Tubes for Steam Reformers and Steam Crackers. NiDITechnical Series, 1992, p. 1–11Google Scholar
  5. 5.
    American Society of Mechanical Engineers, in ASME SB-407 Specification for nickel-iron-chromium alloy seamless pipe and tube, ASME Boiler and Pressure Vessel Code II Part B Nonferrous Material Specifications.( American Society of Mechanical Engineers, New York, 2010)Google Scholar
  6. 6.
    S. Holdsworth, Creep-fatigue failure diagnosis. Materials 8, 7757–7769 (2015)CrossRefGoogle Scholar
  7. 7.
    D. French. Creep and Creep Failures. National Board Classic Series (1991), http://www.nationalboard.org/Index.aspx?pageID=181. Accessed 23 May 2017
  8. 8.
    T.L.D. Silveira, I.L. May, Reformer furnaces: materials, damage mechanisms, and assessment. Arab. J. Sci. Eng. 21(2C), 99–119 (2006)Google Scholar
  9. 9.
    J. Huber, D. Jacobi, Centricast Materials for High- Temperature Service, in International Conference & Exhibition Nitrogen + Syngas (Dusseldorf, Germany, 2011)Google Scholar
  10. 10.
    M. Fulger et al., Analyses of oxide films grown on AISI 304L Stainless Steel and Incoloy 800HT exposed to supercritical water. J. Nucl. Mater. 415, 147–157 (2011)CrossRefGoogle Scholar
  11. 11.
    Bohler Welding Group, Ni and HT steel alloys for Petrochemical Applications. (UTP Schweissmaterial Application Technology, 2012), p. 1–40Google Scholar
  12. 12.
    H.M. Tawancy et al., Failure analysis of catalytic steam reformer tubes. Anti Corros. Methods Mater 52(6), 337–344 (2005)CrossRefGoogle Scholar
  13. 13.
    C. Maharaj, J.P. Dear, A. Morris, A review of methods to estimate creep damage in low-alloy steel power station steam pipes. Strain 45(4), 316–331 (2009)CrossRefGoogle Scholar
  14. 14.
    M.A. Maleque, M.S. Salit, Materials Selection and Design (Springer, Singapore, 2013)CrossRefGoogle Scholar
  15. 15.
    A. Anwer, Reformer Tubes Material Selection (Articles and Publications, 2017), http://www.thepetrostreet.com/article_0011.html. Accessed 15 May 2017
  16. 16.
    F. Gulshan et al., Failure analysis of superheater tubes supports of the primary reformer in a fertilizer factory. J. Fail. Anal. Prev. 5(3), 67–72 (2005)CrossRefGoogle Scholar
  17. 17.
    S.A.J. Jahromi, M. Naghikhani, Failure analysis of HP40-Nb modified primary reformer tube of ammonia plant. Iran. J. Sci. Technol. Trans. B 28(2), 269–271 (2004)Google Scholar
  18. 18.
    K. Hasegawa., in Repair Welding and Metallurgy of HP-Modified Alloy after Long Term Operation. Metal 2001. (Czech Republic, 2001)Google Scholar
  19. 19.
    R. Voicu, et al., in Damage measurements after creep tests on samples of HP-40 alloys modified with a low level addition of Nb, ICF 12. (Canada, 2008), p. 1–10Google Scholar
  20. 20.
    M.H. Shariat, In advanced Creep Failure of H.P. Modified Reformer Tubes in an Ammonia Plant. The Journal of Corrosion Science and Engineering 6(H012), 1–20 (2003)Google Scholar
  21. 21.
    ASTM International, in ASTM E3-11 Standard Guide for Preparation of Metallographic Specimens. Book of Standards. (ASTM International, West Conshohocken, 2011)Google Scholar

Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.Department of Mechanical and Manufacturing EngineeringUniversity of the West IndiesSt. AugustineTrinidad and Tobago
  2. 2.San AntonioUSA
  3. 3.In-Corr-Tech Ltd.,San FernandoTrinidad and Tobago

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