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Journal of Failure Analysis and Prevention

, Volume 9, Issue 5, pp 479–485 | Cite as

Analysis of Leakage Failure in a Domestic Hydraulic Installation Assisted by Pitting Corrosion of Water Tube

  • G. Pantazopoulos
Technical Article---Peer-Reviewed

Abstract

Deoxidized high phosphorus copper (C12200, DHP-Cu) is the principal construction material in hydraulic and heating ventilation and air-conditioning installations due to its excellent thermal/electrical conductivity, formability, corrosion resistance and antimicrobial properties. However, design and installation deficiencies or aggressive environmental conditions, such as improper water chemistry, may lead to unexpected failures. A corroded copper water tube caused leakage in a domestic hydraulic installation close to the sea coast area. The leakage was reported after short-time period in service. After installation the pipeline was not in continuous operation and remained unused for approximately 3–6 months per year. Tubes were disconnected from a hydraulic installation and samples were taken for failure investigation. Failure analysis findings suggest strongly that the leakage was caused by tube perforation from the waterside by severe localized pitting corrosion. The main cause of the accelerated tube pitting corrosion was probably the improper water quality (high hardness and electrical conductivity) but the potential for an aggressive environment created by substances, such as chlorides and organic compounds, could not be excluded.

Keywords

DHP-copper Pitting corrosion Leakage failure Corrosion deposits 

Notes

Acknowledgments

The author wishes to express special thanks to Mr. A. Vazdirvanidis for the fruitful technical discussion and Mr. A. Rikos and Mr. A. Toulfatzis for their valuable contribution to the completion of the experimental work.

References

  1. 1.
    Duffner, D.H.: Air-conditioner failure investigation—intergranular cracking in a pure copper condenser tube. J. Fail. Anal. Preven. 5(1), 79–85 (2005)CrossRefGoogle Scholar
  2. 2.
    McDougall, J.L., Stevenson, M.E.: Stress-corrosion cracking in copper refrigerant tubing. J. Fail. Anal. Preven. 5(1), 13–17 (2005)CrossRefGoogle Scholar
  3. 3.
    Pantazopoulos, G., Tsinopoulos, G.: Corrosion of a copper U-shaped heating element: some microstructural and morphological observations. J. Fail. Anal. Preven. 6(6), 8–12 (2006)CrossRefGoogle Scholar
  4. 4.
    Stevenson, M.E., Barkey, M.E., McDougall, J.L.: Stresses in bent copper tubing: application to fatigue and stress-corrosion cracking failure mechanisms. J. Fail. Anal. Preven. 5(6), 25–29 (2005)CrossRefGoogle Scholar
  5. 5.
    Pantazopoulos, G.: Metallurgical observations on fatigue failure of a bent copper tube. J. Fail. Anal. Preven. 9(3), 270–274 (2009)CrossRefGoogle Scholar
  6. 6.
    Olszewski, A.M.: Avoidable MIC-related failures. J. Fail. Anal. Preven. 7(4), 238–246 (2007)Google Scholar
  7. 7.
    Pantazopoulos, G., Vazdirvanidis, A.: Microbiologically influenced corrosion in water pipes: a morphological study. Microsc. Anal. (118), pp. 5–10, Europe, March 2009Google Scholar
  8. 8.
    ASM Handbook Vol. 13: Corrosion, 4th edn. ASM International, Materials Park, OH (1992)Google Scholar

Copyright information

© ASM International 2009

Authors and Affiliations

  1. 1.ELKEME Hellenic Research Centre for Metals S.A.AthensGreece

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