On the residual strength of aging cast iron trunk mains: Physically-based models for asset failure

Fahimi, Azadeh; Evans, Timothy S.; Farrow, Jeff; Jesson, DA; Mulheron, M.; Smith, Paul A.

doi:10.1016/j.msea.2016.03.029

Cited by 14 publications

(4 citation statements)

References 17 publications

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“…It is noted that in Section III we discussed the proposition of the marginal distribution to convert the non-Gaussian realistic RWT measurements to the standard normally distributed RWT values for learning the 3D GP model and then conducting the predictions of the standard normally distributed RWT values at unmeasured locations, as demonstrated in equations (8) and (9). The final step in the inference procedure is to conduct the inversion of the standard normally distributed RWT predictions into the approximation of the realistic RWT values at unmeasured positions.…”

Section: Full Pipe Rwt Data Reconstructionmentioning

confidence: 99%

“…Hence, some methods such as the fracture mechanics and loss-of-section [6]- [11] have been proposed for computing residual strength or likely failure of the pipe. In contrast to the fracture mechanics approach [8], [10], the loss-of-section technique [11] requires remaining thickness of a pipe wall to be known. In equivalent words, remaining wall thickness (RWT) of a water pipe is required to be measured before its failure analysis can be conducted.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Evaluation of Remaining Wall Thickness in Corroded Water Pipes Using Pulsed Eddy Current Data

Nguyen

Miró

2020

IEEE Sensors J.

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In order to analyse failures of an ageing water pipe, some methods such as the loss-of-section require remaining wall thickness (RWT) along the pipe to be fully known, which can be measured by the magnetism based non-destructive evaluation sensors though they are practically slow due to the magnetic penetrating process. That is, fully measuring RWT at every location in a water pipe is not really practical if RWT inspection causes disruption of water supply to customers. Thus, this paper proposes a new data prediction approach that can increase amount of RWT data of a corroded water pipe collected in a given period of time by only measuring RWT on a part (e.g. 20%) of the total pipe surface area and then employing the measurements to predict RWT at unmeasured area. It is proposed to utilize a marginal distribution to convert the non-Gaussian RWT measurements to the standard normally distributed data, which can then be input into a 3-dimensional Gaussian process model for efficiently predicting RWT at unmeasured locations on the pipe. The proposed approach was implemented in two real-life in-service pipes, and the obtained results demonstrate its practicality.

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Section: Full Pipe Rwt Data Reconstructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient Evaluation of Remaining Wall Thickness in Corroded Water Pipes Using Pulsed Eddy Current Data

Nguyen

Miró

2020

IEEE Sensors J.

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“…Besides these approaches, there are some interesting pieces of work focusing on cast iron pipelines, which could be applicable under some assumptions [31][32][33]. For instance, Ji et al [31] evaluate large-diameter cast iron pipelines based on finite element simulations following probabilistic modeling.…”

Section: Yield Criterion and Application For Corroded Pipelinesmentioning

confidence: 99%

Reliability assessments of corroded pipelines based on internal pressure – A review

Amaya-Gómez

Sánchez-Silva

Bastidas‐Arteaga

et al. 2019

Engineering Failure Analysis

135

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Corrosion is one of the most significant threats for onshore pipelines that may lead to a Loss of Containment (LOC). A LOC poses significant consequences over the surrounding people and environment because of the hazardousness of the transporting fluids, so different efforts have been raised to predict pipe failures, which are commonly based on reliability assessments with limit state functions. These functions are gathered in serviceability, leakage, and ultimate conditions, out of which the last two approaches contemplate a LOC. This paper reviews recognized limit state functions for corroded pipelines, and it discusses their assumptions and applicability. Specifically, this paper focuses on burst limit pressures considering the relevance in the academic literature and Oil & Gas standards. Therefore, a thorough comparison is presented based on failure criteria, acceptable defect dimensions, failure probability, and error prediction based on experimental and numerical burst tests. The objective is to evaluate the level of conservatism of each simplified model depending on the material toughness and the corrosion rate. This review aims to support a reliability model selection in corroded pipelines for future intervention strategies.

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“…In conjunction with the variation in the depth of graphitisation from point to point within the trunk main pipe, it should be noted that the stress, arising from a combination of vertical load (due for instance to soil and traffic) and water pressure, will vary with position around the pipe. These effects were considered in a recent paper by Fahimi et al (2016).…”

Section: Installation Defectsmentioning

confidence: 99%

What does NDE need to achieve for cast iron pipe networks?

Rainer

Capell

Clay-Michael³

et al. 2017

Infrastructure Asset Management

Self Cite

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Grey cast iron water pipe networks have been installed around the world, often 100-180 years ago. Cohorts (which can be defined by age, size, casting technology and geographical location, to specify but a few groups) degrade at different rates due to environmental and in-service issues, which can lead to a significant loss in mechanical performance. Hence, the management of these assets can be extremely problematic in terms of identifying priorities. The current paper considers the causes of such degradation, the consequences for defining accurate and up-to-date condition assessment protocols and hence the type and urgency of rehabilitation strategies. It follows that understanding the integrity/life expectancy of water networks requires non-destructive evaluation (NDE) of largediameter cast iron trunk mains, with particular reference to the kinds of defects that are likely to be present and the issues that make assessment difficult. From this, recommendations are outlined for asset managers required to specify NDE protocols, based on an understanding of the nature of the material and conditions in the field.

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On the residual strength of aging cast iron trunk mains: Physically-based models for asset failure

Cited by 14 publications

References 17 publications

Efficient Evaluation of Remaining Wall Thickness in Corroded Water Pipes Using Pulsed Eddy Current Data

Efficient Evaluation of Remaining Wall Thickness in Corroded Water Pipes Using Pulsed Eddy Current Data

Reliability assessments of corroded pipelines based on internal pressure – A review

What does NDE need to achieve for cast iron pipe networks?

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