Probability of Failure Analysis due to Internal Corrosion in Cast-Iron Pipes
Publication: Journal of Infrastructure Systems
Volume 16, Issue 1
Abstract
In cast-iron pipes, chlorine consumption due to internal corrosion is high compared with consumption caused by other water-quality factors in such systems and may be considered as an approximate indicator of the rate of internal corrosion. Herein, a relationship is developed that determines the rate of internal corrosion as a function of the chlorine concentration, the chlorine decay constant, and the velocity of the water in a pipe segment with a given length and diameter. These factors may be considered uncertain at any given time and the probability of mechanical failure due to the thinness of the pipe wall caused by internal corrosion throughout the pipe life is estimated using Monte Carlo simulation, the first-order reliability method, and the second-order reliability method to account for these uncertainties. The results indicate that the likelihood of failure is nearly 50% by the 80th year for a cast-iron pipe length of 6 m and a diameter of 203 mm, and that the affect of internal corrosion on the pipe wall thickness and thus mechanical failure is lower than, but on the same order of magnitude as, the effect of external corrosion.
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Acknowledgments
The writers gratefully acknowledge the insights and advice of Professor R. O. Foschi at the University of British Columbia. Financial support for this research was provided by a Natural Science and Engineering Research Council of Canada (NSERC) Discovery Grant to the second writer (Award No. UNSPECIFIED201025-03),
References
Ahammed, M., and Melchers, R. E. (1994). “Reliability of underground pipelines subject to corrosion.” J. Transp. Eng., 120(6), 989–1002.
Ahammed, M., and Melchers, A. M. (1996). “Closure to ‘Reliability of underground pipelines subject to corrosion.’” J. Transp. Eng., 122(5), 408–408.
Baeckmann, W., Schwenk, W., and Prinz, W. (1997). Handbook of cathodic corrosion protection: Theory and practice of electrochemical protection processes, 3rd Ed., Gulf Professional.
Barbier, J. P., Cordonnier, J., and Gabriel, J. M. (1990). “Corrosion metalique et phenomenes d’eaux reux rouges-utilisation d’inhibiteurs.” T.S.M.-L’EAU, 183–188.
Benjamin, M. M., Sontheimer, H., and Leroy, P. (1996). “Internal corrosion of water distribution systems.” Cooperative Research Rep., AWWA, Denver.
Foschi, R., and Li, H. (2005). Reliability analysis software, version 7, University of British Columbia, Vancouver, B.C.
Kiene, L., Lu, W., and Levi, Y. (1998). “Relative importance of the phenomena responsible for chlorine decay in drinking water distribution systems.” Water Sci. Technol., 38(6), 219–227.
Kiene, L., and Wable, M. (1996). Characterization and modeling of chlorine decay in distribution system, AWWARF and AWWA, Denver.
Kirmeyer, G. J., Richards, W., and Smith, C. D. (1994). An assessment of water distribution systems and associated research needs, American Water Works Association Research Foundation (90658), Denver.
Mays, L. (2000). Water distribution handbook, McGraw-Hill, New York.
Menaia, J., Coelho, S. T., Lopes, A., Fonte, E., and Palma, J. (2003). “Dependency of bulk chlorine decay rates on flow velocity in water distribution networks.” Journal of IWA, 3(1–2), 209–214.
Rajani, B., and Mc Donald, S. (1995). “Water mains break data on different pipe materials for 1992 and 1993.” Rep. No. A-7019.1, National Research Council of Canada, Ottawa.
Sadiq, R., Rajani, B., and Kleiner, K. (2004). “Probabilistic risk analysis of corrosion associated failures in cast iron water mains.” Reliab. Eng. Syst. Saf., 86, 1–10.
Sadiq, R., Syed, A. I., and Kleiner, Y. (2007). Examining the impact of water quality on the integrity of distribution infrastructure, National Research Council of Canada and AWWARF, Denver.
Snoeyink, V. L., and Wagner, I. (1996). “Internal corrosion of water distribution systems.” Cooperative Research Rep., AWWA, Denver.
Vasconcelos, J. J., et al. (1996). “Characterization and modeling of chlorine decay in distribution system.” AWWARF and AWWA, Denver.
Information & Authors
Information
Published In
Journal of Infrastructure Systems
Volume 16 • Issue 1 • March 2010
Pages: 73 - 80
Copyright
© 2010 ASCE.
History
Received: Oct 9, 2007
Accepted: Jul 27, 2009
Published online: Feb 12, 2010
Published in print: Mar 2010
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