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Failure Analysis of Carbon Steel Tubes in a Reformed Gas Boiler Feed Water Preheater

  • A. Marquez
  • Amrit Ramnanan
  • C. MaharajEmail author
Case History---Peer-Reviewed
  • 14 Downloads

Abstract

This study involves the failure analysis of carbon steel tubes in a reformed gas boiler feed water preheater unit operating at an ammonia plant. It was determined that the incipient failure mechanism in the carbon steel tubes was pitting corrosion at the inner surface of the failed tube transporting boiler feed water. The spectroscopic and microscopic analysis revealed the presence of iron oxides, including magnetite (Fe3O4), on the surface of a hole inside a pit formed in the inner surface. A significant thickness reduction in the internal wall due to subsequent erosion–corrosion led to the formation of the hole. No voids/cracks were present in the grain boundaries in the (ferritic and pearlitic) microstructure of the carbon steel tube (A214). Due to the recurrent nature of the failure of the carbon steel tubes in the preheater unit, SS304L tubes are recommended to be used throughout the waterside of the preheater.

Keywords

Failure analysis Corrosion Preheater Carbon steel Iron oxides 

Notes

Acknowledgments

The authors would like to acknowledge the support of Industrial Plant Services Limited in performing this study.

References

  1. 1.
    Z.-F. Hu, Thermal Power Plants (InTech, Rijeka, 2012)Google Scholar
  2. 2.
    M.R.A. Bahri, in Understanding ASTM 335 P11 Applications and Weldability (2017), https://www.academia.edu/34218951/Understanding_ASTM_335_P11_Applications_and_Weldability. Accessed 4 Feb 2018
  3. 3.
    I. Hajiannia, M. Shamanian, M. Kasiri, Evaluation of the melted zone microstructure in the interface of the dissimilar weld between A335 low alloy steel and ER309L filler metal by gas tungsten arc welding. Int. J. ISSI 11(2), 6–10 (2014)Google Scholar
  4. 4.
    M.A. Hajri, A.U. Malik, A. Meroufel, F. Al-Muaili, Premature failure of dissimilar metal weld joint at intermediate temperature superheater tube. Case Stud. Eng. Fail. Anal. 3, 96–103 (2015)CrossRefGoogle Scholar
  5. 5.
    T. Dudziak, Steam oxidation of Fe-based materials, in High Temperature Corrosion, ed. by Z. Ahmad (InTech, Rijeka, 2016)Google Scholar
  6. 6.
    R.K.S. Raman, A. Al-Mazrouee, High-temperature oxidation of Cr–Mo steels and its relevance to accelerated rupture testing and life assessment of in-service components. Metall. Mater. Trans. 38A, 1750–1759 (2007)CrossRefGoogle Scholar
  7. 7.
    M. Sabouri, H.R. Faridi, Investigation on corrosion failure of Cr–Mo P11 grade pipe in primary section of a superheated steam generation system. High Temp. 55, 139–144 (2017)CrossRefGoogle Scholar
  8. 8.
    A. Saha, H. Roy, Failure investigation of a secondary super heater tube in a 140 MW thermal power plant. Case Stud. Eng. Fail. Anal. 8, 57–60 (2017)CrossRefGoogle Scholar
  9. 9.
    Metallurgical Technologies Inc., in Stress Corrosion Cracking and Intergranular Corrosion of a SS316Ti Preheater Tube (2016). Accessed 31 Jan 2018Google Scholar
  10. 10.
    R. Korhonen, O. Hietanen, Erosion Corrosion of Parallel Feed Water Discharge Lines at the LOVIISA VVER 440 (IVO International Ltd., Vantaa, 1993), pp. 75–85Google Scholar
  11. 11.
    M. Fulger, M. Mihalache, L. Velciu, I. Vitelaru, Corrosion mechanisms of tubes from the Candu high pressure feed water heaters. J. Nucl. Res. Develop. 7, 38–44 (2014)Google Scholar
  12. 12.
    M. Koshy, Super heater tube analysis for oxide scale growth at various operating conditions. Int. J. IRSET 4, 6549–6553 (2015)Google Scholar
  13. 13.
    ASTM International, ASTM A214/A214 M - 96, Standard Specification for Electric-Resistance-Welded Carbon Steel Heat-Exchanger and Condenser Tubes (ASTM International, West Conshohocken, 2012)Google Scholar
  14. 14.
    ASTM International, ASTM E3 - 11(2017), Standard Guide for Preparation of Metallographic Specimens (ASTM International, West Conshohocken, 2012)Google Scholar

Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.National University of the AltiplanoPunoPeru
  2. 2.Industrial Plant Services LimitedCouvaTrinidad and Tobago
  3. 3.Department of Mechanical and Manufacturing EngineeringUniversity of the West IndiesSt. AugustineTrinidad and Tobago

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