Leak-before-break in cast iron mains

A failure analysis of a catastrophic pipe burst on Harris Street, Sydney

R. Jiang, D. Robert, C. R. Hutchinson, X. L. Zhao, J. Kodikara

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This article analyses the failure of a 500 mm-diameter cast iron (CI) water pipe that catastrophically fractured in Sydney in 2013. According to metallurgical analysis and finite element simulation, a longitudinal pre-existing crack initiated from the adjacent bell-joint and eventually propagated to a critical length in the pipe barrel over a certain period. There was evidence of leakage prior to the burst incident but information was inconclusive whether it was exactly from this pipe. Fatigue caused by cyclic internal pressure was considered as the predominant factor in leading to crack growth. A numerical model was developed to describe crack growth behaviour using Paris’ law, and metallurgical analysis and mechanical tests were conducted to support this investigation. Based on the field evidence and simulation results, the leak-before-break approach might be applicable in CI pipes to avoid severe consequences of trunk main bursts.

Original languageEnglish
Pages (from-to)487-494
Number of pages8
JournalWater Practice and Technology
Volume12
Issue number2
DOIs
Publication statusPublished - 1 Jun 2017

Keywords

  • Cast iron pipes
  • Crack growth mechanism
  • Failure analysis
  • Leak-before-break (LBB) window

Cite this

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title = "Leak-before-break in cast iron mains: A failure analysis of a catastrophic pipe burst on Harris Street, Sydney",
abstract = "This article analyses the failure of a 500 mm-diameter cast iron (CI) water pipe that catastrophically fractured in Sydney in 2013. According to metallurgical analysis and finite element simulation, a longitudinal pre-existing crack initiated from the adjacent bell-joint and eventually propagated to a critical length in the pipe barrel over a certain period. There was evidence of leakage prior to the burst incident but information was inconclusive whether it was exactly from this pipe. Fatigue caused by cyclic internal pressure was considered as the predominant factor in leading to crack growth. A numerical model was developed to describe crack growth behaviour using Paris’ law, and metallurgical analysis and mechanical tests were conducted to support this investigation. Based on the field evidence and simulation results, the leak-before-break approach might be applicable in CI pipes to avoid severe consequences of trunk main bursts.",
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Leak-before-break in cast iron mains : A failure analysis of a catastrophic pipe burst on Harris Street, Sydney. / Jiang, R.; Robert, D.; Hutchinson, C. R.; Zhao, X. L.; Kodikara, J.

In: Water Practice and Technology, Vol. 12, No. 2, 01.06.2017, p. 487-494.

Research output: Contribution to journalArticleResearchpeer-review

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