Field study on non-invasive and non-destructive condition assessment for asbestos cement pipelines by time-domain fluid transient analysis

Gong, Jinzhe; Lambert, Martin F.; Zecchin, Aaron C.; Simpson, Angus R.; Arbon, Nicole S.; Kim, Young-il

doi:10.1177/1475921715624505

Cited by 30 publications

(9 citation statements)

References 35 publications

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“…matrix, the hydrated silicates in the cement mortar decompose. This results in hole formation within the pipe matrix, eventually leading to a soft material where the cement no longer binds the asbestos (Gong et al, 2016). Lime leaching in pipes can also occur when conveying very soft water (pH >7 and a hardness of < mg/l of calcium and magnesium carbonate) which promotes lime leaching and eventually leads to pipe failure (Al-Adeeb and Matti, 1984).…”

Section: Corrosion and Chemical Degradationmentioning

confidence: 99%

Improving pipe failure predictions: Factors affecting pipe failure in drinking water networks

et al. 2019

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Section: Corrosion and Chemical Degradationmentioning

confidence: 99%

Improving pipe failure predictions: Factors affecting pipe failure in drinking water networks

et al. 2019

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“…cannot be suppressed from averaging), therefore making the identification of the leak-induced signal difficult. Understanding the characteristics of different types of reflections is essential: for a positive step incident wave, the reflection from a leak is a negative step [as shown in Figure 9(a)] and multiple leaks will induce multiple negative-step reflections at different times; the reflection from a discrete blockage is a positive step [6]; the reflection from an extended blockage (or a thicker-walled section) is a positive step followed by a negative step [5,17]; and the reflection from a section with an extended corrosion (or a thinner-walled section) is a negative step followed by a positive step [10]. The response of different types of physical discontinuities also have different features in the frequency domain.…”

Section: Influence Of Pipe Network Complexitymentioning

confidence: 99%

“…One practical challenge is that the measurement from a single sensor is always a superposition of two pressure waves travelling upstream and downstream along the pipe, resulting in complex wave forms and difficulty in data analysis. To resolve the directional information, multiple measurement points are needed [8,16,17]. For a given water transmission pipe, the distance between any two adjacent measurement stations is typically several hundred metres because access points are often sparsely located.…”

Section: Introductionmentioning

confidence: 99%

In-pipe fibre optic pressure sensor array for hydraulic transient measurement with application to leak detection

et al. 2018

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Controlled hydraulic transient pressure waves can be used to actively assess the condition of pressurised pipelines (e.g. leak detection). One practical challenge to the application of the technique to buried water pipelines is in the pressure measurementfast-response pressure transducers are costly and the deployment is limited to one sensor per access point (e.g. at air valves or fire hydrants). The measurement from a single sensor is always the superposition of the waves travelling upstream and downstream along a pipe. It is often difficult to determine the direction of the propagating waves, unless there are suitable locations nearby where additional measurements can be made. The research reported here develops a fibre optic pressure sensor array for in-pipe transient pressure measurement. The sensor array consists of five Fibre Bragg Gratings (FBGs), each formed into a custom designed pressure transducer. The cable containing the array has a diameter of approximately 4 mm, making it easy to insert into a pipeline through a single access point for distributed transient pressure measurement. The usefulness of the fibre optic pressure sensors for transient-based pipeline leak detection is validated through laboratory experiments. The measurement from each individual fibre optic sensor is generally consistent with conventional piezo-resistive pressure transducers over a wide frequency range. The sensor array configuration enables the determination of the directional information of waves, therefore enhancing the ability of pipeline defect detection and localisation.

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“…For condition assessments of AC pipes to be effective, it is crucial to have access to non-destructive, in-line techniques to measure the remaining wall thickness, the part of the pipe wall that has not yet been degraded by processes such as leaching and chemical attack. Internationally, several promising avenues of measurement based on either acoustic or electromagnetic wave reflection have been developed [1,2], some of which have the potential for defect detection in metallic pipes as well [3,4]. Specific implementations have been piloted in The Netherlands since the early 2000s, such as a repurposing of ground penetrating radar [5][6][7] and pulse echo ultrasound [8].…”

Section: Introductionmentioning

confidence: 99%

CT Scans of Asbestos Cement Pipes as a Reference for Condition Assessment of Water Mains

Laarhoven

Steen

Hulst

et al. 2021

Water

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The water distribution network of The Netherlands contains around 30,000 km of asbestos cement (AC) pipes, which constitutes around 25% of the total network. As a pipe material, AC has a relatively poor performance, and therefore is a high priority for renewal. To help decide an effective order of replacement, the water utilities need condition assessment techniques that help them determine which pipes have the highest risk of failure. In the presented work, X-ray computed tomography (CT) was used to measure the degradation of AC pipes taken out of the field. These scans provide a description of the pipe degradation with unmatched detail. The results are compared with strength tests performed on the same pipes, revealing that detailed knowledge of the complete pipe degradation is more important than previously assumed. Moreover, comparison of the CT results to those of a commercial, non-destructive inspection technique was used as a new avenue for validation of this technique, demonstrating its future usefulness for attaining the detailed measurement of pipe degradation required by water utilities.

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Field study on non-invasive and non-destructive condition assessment for asbestos cement pipelines by time-domain fluid transient analysis

Abstract: Field study on non-invasive and non-destructive condition assessment for asbestos cement pipelines by time-domain fluid transient analysis

Cited by 30 publications

References 35 publications

Improving pipe failure predictions: Factors affecting pipe failure in drinking water networks

Improving pipe failure predictions: Factors affecting pipe failure in drinking water networks

In-pipe fibre optic pressure sensor array for hydraulic transient measurement with application to leak detection

CT Scans of Asbestos Cement Pipes as a Reference for Condition Assessment of Water Mains

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