Alteration of Soil Support to Cast Iron Pipelines due to Corrosion

Abed, Tara Moghareh; Chapman, David; Rogers, Christopher; John, U. E.

doi:10.1061/9780784413012.059

Cited by 2 publications

(1 citation statement)

References 20 publications

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“…As such, a laboratory regime that utilised direct influence of anode-cathode interactions (electrokinetic treatment) to accelerate corrosion via forced ion migration and pH modification was used to stimulate conductivity modification around corroding iron pipes, through release and interaction of iron oxides with surrounding clay. The use of electrokinetic treatment to induce corrosion and assess modification of surrounding clay soils have been shown in previous research [13], [14].…”

Section: Evaluation Of the Electromagnetic Properties Of Corrosiomentioning

confidence: 99%

Investigation of soil contamination by iron pipe corrosion and its influence on GPR detection

Pennock

Abed

Curioni

et al. 2014

Proceedings of the 15th International Conference on Ground Penetrating Radar

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It has been observed that the corrosion of iron pipes in soil can produce variations in ground conductivity around the pipe, and that the visibility of such pipes to GPR can be greatly reduced. This new investigation and measurement of the permittivity and conductivity of soil contaminated by iron pipe corrosion products produces more accurate knowledge of permittivity and conductivity data and their likely spatial vari ation with distance from the corroding pipe. The experimental data are the result of monitoring accelerated corrosion over a period of several weeks and using TDR and direct conductivity measurement schemes. FDTD simulations of GPR signals show how the corrosion induced variation in the visibility of the pipe varies with the thickness and shape of the new spatial variations permittivity and conductivity.The results indicate that in the earlier stages of pipe corrosion use of lower GPR frequencies will still detect the pipe, although at lower spatial resolution.

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Section: Evaluation Of the Electromagnetic Properties Of Corrosiomentioning

confidence: 99%

Investigation of soil contamination by iron pipe corrosion and its influence on GPR detection

Pennock

Abed

Curioni

et al. 2014

Proceedings of the 15th International Conference on Ground Penetrating Radar

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Experimental Investigation into the Effects of Cast-Iron Pipe Corrosion on GPR Detection Performance in Clay Soils

Abed¹,

Torbaghan

Hojjati

et al. 2020

J. Pipeline Syst. Eng. Pract.

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Cast iron water distribution pipes are used widely in the UK and worldwide. Corrosion of these cast iron pipes often occurs due to an electrochemical process where the pipe is buried directly in a chemically aggressive ground (as is the case for some clays). The electrochemical process changes the pH environment and releases iron ions into the clay. This can cause chemical alteration of the clay minerals and 'corrosion products', such as iron oxide, hydroxide and aqueous salts, to form in the soil. These chemical interactions are complex and time dependent, and can potentially result in pipe failure, and thus the conditions under which they occur need to be understood. Ground Penetrating Radar (GPR) has been proposed for routinely detecting, assessing and monitoring buried cast iron pipes, and thus it is important to know how these chemical changes affect the electromagnetic properties of soil. A bespoke set of laboratory experiments was devised to simulate and accelerate cast iron corrosion (using electrokinetics) and ion migration processes in two types of clay, namely Kaolin Clay and Oxford Clay. Tests were conducted for periods of up to 3 months using both inert electrodes and a cast iron disc as the anode. The changes in the geotechnical properties (undrained shear strength, moisture content and Atterberg limits), the geophysical properties (permittivity) and the geochemical properties (iron content, pH and conductivity) were monitored. The results indicated that the Oxford Clay was much more aggressive in terms of the corrosion activity compared to the Kaolin Clay. The laboratory results were used in GPR simulations in relation to the detection of a buried cast iron pipe. The results showed that the chemically induced changes to the Kaolin Clay did not materially affect the performance of GPR to detect the cast iron pipe, whereas a pipe buried in Oxford Clay the (greatly accelerated) chemically-induced changes were sufficiently advanced after approximately 7-8 weeks to cause the GPR to be unable to detect the corroded pipe.

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Alteration of Soil Support to Cast Iron Pipelines due to Corrosion

Cited by 2 publications

References 20 publications

Investigation of soil contamination by iron pipe corrosion and its influence on GPR detection

Investigation of soil contamination by iron pipe corrosion and its influence on GPR detection

Experimental Investigation into the Effects of Cast-Iron Pipe Corrosion on GPR Detection Performance in Clay Soils

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