Advertisement

Journal of Failure Analysis and Prevention

, Volume 14, Issue 4, pp 454–458 | Cite as

Corrosion Failure of an In-service Economizer Tube

  • H. Roy
  • P. Sharma
  • D. Ghosh
  • A. K. Shukla
Case History---Peer-Reviewed

Abstract

This investigation was primarily aimed to examine the in-service failure of an economizer tube. Apart from preliminary visual examination, the analysis for the probable cause of failure was supplemented with radiographic examination, metallographic examination, energy dispersive spectroscopy, and scanning electron microscopy. Finally, it was concluded that there was seepage of water from an unusual blowhole-like through-thickness hole in the weld region of the economizer tube. This water vaporized and reacted with the flue gases and caused localized corrosion and led to the ultimate failure of the tube.

Keywords

Economizer Corrosion Blowhole Sulfur Weld 

Notes

Acknowledgments

The authors are grateful to Ms. Ellen Frye, Media Planner, Buckman International for her kind support in the final preparation and editing of the manuscript.

References

  1. 1.
    R. Vishwanathan, Damage Mechanism and Life Assessment of High Temperature Components (ASME International, Metals Park, 1989), p. 236Google Scholar
  2. 2.
    R. Viswanathan, R. Dooley, A. Saxena. Proceedings of International Conference on Life Assessment and Extension, Vol II, Congress Centre, The Hague 1988, p. 175Google Scholar
  3. 3.
    R. Viswanathan, Damage Mechanism and Life Assessment of High Temperature Components (ASME International, Metals Park, OH, 1989), p. 22Google Scholar
  4. 4.
    R. Viswanathan, J.R. Foulds, D.A. Roberts, in Methods for Estimating the Temperature of Reheater and Superheater Tubes in Fossil Boilers. Proceedings of International Conference on Life Extension and Assessment, The Hague, 1988, p. 148Google Scholar
  5. 5.
    British Electricity International, Modern Power Station Practice, 3rd edn. (Pergamon Press, Oxford, 1963)Google Scholar
  6. 6.
    A. Saha, H. Roy, A.K. Shukla, J. Fail. Anal. Prev. 10, 187–190 (2010)CrossRefGoogle Scholar
  7. 7.
    N.K. Mukhopadhyay, S.G. Chowdhury, R.K. Sinha, D.K. Bhattacharya, S. Chaudhuri, Eng. Fail. Anal. 6, 233–243 (1999)CrossRefGoogle Scholar
  8. 8.
    D. Ghosh, H. Roy, A.K. Shukla, J. Fail. Anal. Prev. 28, 109–114 (2010)Google Scholar

Copyright information

© ASM International 2014

Authors and Affiliations

  1. 1.NDT & Metallurgy GroupCSIR-Central Mechanical Engineering Research InstituteDurgapurIndia
  2. 2.Research & DevelopmentBuckman InternationalMemphisUSA

Personalised recommendations