Mechanical Properties and Strength of Aged Cast Iron Water Pipes

Seica, Michael V.; Packer, Jeffrey A.

doi:10.1061/(asce)0899-1561(2004)16:1(69)

Cited by 60 publications

(23 citation statements)

References 8 publications

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“…with failure strains typically below 0.2%). This is in agreement with the observations of Seica and Packer 11 , who concluded from their work on exhumed cast iron water pipes that ‘ All tests, with the exception of the compression test, have revealed the highly brittle nature of this material ’. Simple linear beam theory was used to derive the strength of samples tested in flexure and subsequently the survival probabilities for each specimen in its sample set were determined according to .…”

Section: Methodssupporting

confidence: 92%

Weibull analysis, extrapolations and implications for condition assessment of cast iron water mains

Belmonte

Mulheron

Smith

2007

Fatigue Fract Eng Mat Struct

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The applicability of Weibull statistics to the condition assessment of cast iron water distribution pipes has been considered. The effect of Weibull modulus, characteristic strength, sample size and mode of loading (tension or flexure) on the strength of cast iron water distribution pipes is investigated. The strength distribution of cast iron samples cut from sections of five different water distribution pipes recovered from the ground have been characterized. Strengths have been measured in flexure, at two different temperatures (ambient and 0 degrees C), and in tension at ambient temperature using two different sample sizes. It is shown that characteristic strength values in flexure decrease with increasing size of graphite flake and that there is no significant difference between the results at the two temperatures investigated. For samples of the same volume tested in tension and flexure, the reduced strength measured in tension is consistent with Weibull predictions. However, the strength of large samples tested in tension was not significantly different from the small samples, perhaps because the samples were of the same thickness and conventional Weibull scaling is not applicable. Finally, using a method which treats a large pipe as an assembly of small samples, the strength distributions from the small samples tested in tension are used to make a prediction of the strengths of 1 m span sections of pipe loaded in three-point bending, which were reported in previous work. The predicted pipe strengths are close to the lower end of the measured pipe strength distribution. Overall, this work suggests that Weibull analysis is a useful tool to examine the strength distribution of removed from cast iron water pipes and so has the potential to contribute in the assessment of asset condition

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Section: Methodssupporting

confidence: 92%

Weibull analysis, extrapolations and implications for condition assessment of cast iron water mains

Belmonte

Mulheron

Smith

2007

Fatigue Fract Eng Mat Struct

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“…Those changes occur when the material is bended from external impacts and loads, some of which are earth moves, natural hazards or other random events [10] and internal pressure fluctuations. Many studies were conducted on grey cast-iron and being developed by Sadiq [11]. The author used excavated cast-iron pipes from the water distribution network of Toronto, Ontario.…”

Section: Assessment Of Water Mains Loadingmentioning

confidence: 99%

Proposed probabilistic models of pipe failure in water distribution system

Pham

Thư

et al. 2018

MATEC Web Conf.

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Abstract. All pipes in water supply network are installed underground, so it is difficult to identify pipe failure location during the operation of a system. Prediction of the risk of pipe failure in the water distribution systems is necessary for preparation of reparations and displacement of a pipe network system. Based on the probability of pipe failure, it will be possible to save money and labor cost for water supply companies. Many studies have been conducted on this topic, some of which used experimental models, others used statistical models in which recently many authors used regression model, but almost all the models come up with calculating the pipe failure rate per unit length of pipe in a year. It is not a direct probability of pipe failure. This article reviews various methods to evaluate pipe failure in water distribution systems. Based on that, the authors proposed two models: Regression Logistic Model and Decision Tree Model that would support an effective decision making for detecting the pipe failure and proposing appropriate solutions.

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“…The material properties Young's modulus, Poisson's ratio and maximum principal strength, were assigned values of 80 GPa, 0.3 and 80 MPa respectively, consistent with references [52,53]. The maximum principle stress criterion was used for crack initiation.…”

Section: Crack Development In the Absence Of Hacmentioning

confidence: 99%

Capacity of pitting corroded pipes under hydrogen assisted cracking

Rajabipour¹,

Melchers²

2015

International Journal of Hydrogen Energy

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Pipe strength a b s t r a c tSteel pipes used in the oil and gas industry when subject to corrosion pitting may fail as a result of internal pressure and metal cracking influenced by hydrogen embrittlement. The progressive shape of the crack, including at the instant of failure, is predicted under increasing internal pressure. It is proposed that when hydrogen-assisted cracking (HAC) is involved the shape of the crack front may be estimated from a parallel numerical analyses in the absence of HAC. The theory for this is outlined and an example given.

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Mechanical Properties and Strength of Aged Cast Iron Water Pipes

Cited by 60 publications

References 8 publications

Weibull analysis, extrapolations and implications for condition assessment of cast iron water mains

Weibull analysis, extrapolations and implications for condition assessment of cast iron water mains

Proposed probabilistic models of pipe failure in water distribution system

Capacity of pitting corroded pipes under hydrogen assisted cracking

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