Failure prediction of buried pipe network with multiple failure modes and spatial randomness of corrosion

Published on Jun 1, 2021in International Journal of Pressure Vessels and Piping2.23
· DOI :10.1016/J.IJPVP.2021.104367
Weigang Wang5
Estimated H-index: 5
(RMIT: RMIT University),
Yanlin Wang2
Estimated H-index: 2
(RMIT: RMIT University)
+ 2 AuthorsChun-Qing Li22
Estimated H-index: 22
(RMIT: RMIT University)
Abstract Buried pipes, as a significant civil infrastructure, play a vital role in water, oil and gas transports. In this paper, a systematic method is developed to accurately predict the failure probability of a buried pipeline network at various levels of failure mode, pipe segment and whole pipeline system. A framework of system reliability is proposed to integrate the ultimate and serviceability failures. The random field theory is employed to model the distribution of corrosion, considering its spatial and temporal variability. A time-dependent reliability method is used to determine the probability of pipe failures with either the structural response or resistance modeled as a stochastic process. A worked example is presented to illustrate the application of the proposed methodology. It is found that the developed method is able to predict when, where and what to fail in a pipeline network. It is also found that both the spatial variability of corrosion and auto-correlation of stochastic process between two time points have significant impacts on the probability of pipeline system failure. The paper concludes that the developed method can equip pipe engineers and asset managers with a tool in accurately predicting the failure of pipeline network with a view to cost-effective management of the pipeline network.
#1Weigang Wang (RMIT: RMIT University)H-Index: 5
#2Dilan Robert (RMIT: RMIT University)H-Index: 12
Last. Chun-Qing Li (RMIT: RMIT University)H-Index: 10
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A review of published literature on the corrosion of metal pipes reveals that current research on corrosion of full-size pipe sections in real soil conditions is highly limited, with almost no research reported on the corrosion effect on degradation of mechanical properties, and fracture toughness in particular, of cast iron pipes buried in real soil. This paper presents a new testing methodology for investigating the corrosion of cast iron pipes in real soil and evaluating its effect on the deg...
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Destructive effects of pipeline structural failure on the worldwide social, environmental and financial aspects reveal the importance of accurate reliability assessment of these infrastructures. In this research, the structural integrity of water cast iron pipes is assessed by a spatial-temporal reliability analysis. Random field representation is used for taking the spatial variability of corrosion depth into account. A probabilistic model for correlation length of corroded cast iron surfaces i...
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Cast iron was the dominant material for buried pipes for water networks prior to the 1970s in Australia and overseas. At present, many water utilities still have a significant amount of ageing cast iron pipes. Cast iron is a brittle material and when large diameter cast iron pipes (diameters above 300 mm) further deteriorate, the consequences of failure can be substantial. Focusing on the likelihood of failure to assist risk assessment, this paper examines the performance of large-diameter cast ...
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