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Journal of Failure Analysis and Prevention

, Volume 12, Issue 6, pp 654–659 | Cite as

Failure Analysis of an Aqua Tubular Boiler Tube

  • Cassio Barbosa
  • Simone Kessler de Barros
  • Ibrahim de Cerqueira Abud
  • Joneo Lopes do Nascimento
  • Sheyla Santana de Carvalho
Technical Article---Peer-Reviewed

Abstract

In general, boilers are subjected to aggressive environmental conditions and, for this reason, there is a real necessity of controlling some parameters such as quality of input water, amount and types of addition agents used in the water, and operational conditions of the equipment (pressure and temperature). The lack of control of these and other parameters can cause loss of performance of the boiler by higher amount of fuel consumption, loss of efficiency, or even rupture of components, causing severe accidents. This study has as purpose the failure analysis in a pipe of the lateral wall of a boiler, known as aqua tubular, of an aircraft carrier flat top boat during a test in sea. The material of the pipes, according to preliminary information, is ASTM 192 steel, which is adequate for this kind of application. Through microstructural analysis in important regions for the study of this failure and earlier information about equipment operation, the cause of rupture of the pipe, which was changed only 50 h before the accident, was analyzed. It was observed that incrustations, corrosion pits in the walls of the pipe, and high temperatures together with microstructural changes were the probable causes of the pipe rupture. It can also be concluded that the analyzed failure had no relation with the quality of the material or the fabrication process of the component.

Keywords

Failure analysis Boiler Steels Microstructure 

References

  1. 1.
    Larson, T.E., Skold, R.V.: Laboratory studies relating mineral water quality to corrosion of steel and cast irons. Corrosion 14, 285–288 (1958)Google Scholar
  2. 2.
    Wikipedia. http://pt.wikipedia.org/wiki/Caldeira. Accessed 5 Feb 2008
  3. 3.
    Berry, W.E.: Corrosion by water and steam. In: NACE Basic Corrosion Course, chap. 7, pp. 1–29. NACE, Houston, April 1971Google Scholar
  4. 4.
    Becker, W.T., Shipley, R.J. (eds.): ASM Handbook—Failure Analysis and Prevention, vol. 11. ASM International, Materials Park (2002)Google Scholar
  5. 5.
    Cramer, S.D., Covino Jr., B.S. (eds.): ASM Handbook—Corrosion: Fundamentals, Testing and Protection, vol. 13-A. ASM International, Materials Park (2003)Google Scholar
  6. 6.
    ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.09 on Carbon Steel Tubular Products: ASTM A192/A192M—2002 Standard: Standard Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service. American Society for Testing Materials, West Conshohocken, PAGoogle Scholar
  7. 7.
    Pardal, J.M., Carvalho, S.S., Barbosa, C., Montenegro, T.R., Tavares, S.S.M.: Failure analysis of AISI 310S plate in an inert gas generator used in off-shore oil platform. Eng. Fail. Anal. 18, 1435–1444 (2011)CrossRefGoogle Scholar
  8. 8.
    Pickering, F.B.: Physical Metallurgy and the Design of Steels. Applied Science Publishers Ltd., London (1978)Google Scholar
  9. 9.
    Backwood, R.R., Jarvis, L.M., Hoffman, D.G., Totten, G.E.: Conditions leading to the quench cracking other than severity of quench. In: 18 th Heat Treating Society Conference, Proceedings, pp. 575–588. ASM international, Rosemont, 12–15 Oct 1998Google Scholar
  10. 10.
    Kou, S.: Welding Metallurgy. Wiley, New York (1987)Google Scholar
  11. 11.
    Baxter Jr., D.F. (ed.): ASM Handbook—Fractography, vol. 12. ASM International, Materials Park (1987)Google Scholar
  12. 12.
    Wouters, R., Froyen, L.: Scanning electron microscope fractography in failure analysis of steels. Mater. Charact. 36, 357–364 (1996)CrossRefGoogle Scholar

Copyright information

© ASM International 2012

Authors and Affiliations

  • Cassio Barbosa
    • 1
  • Simone Kessler de Barros
    • 1
  • Ibrahim de Cerqueira Abud
    • 1
  • Joneo Lopes do Nascimento
    • 1
  • Sheyla Santana de Carvalho
    • 1
  1. 1.Instituto Nacional de Tecnologia (INT)Rio de JaneiroBrazil

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