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Available for download
Product Number:
51317--9381-SG
ISBN:
9381 2017 CP
Author:
Sujay Math
Publication Date:
2017
$20.00
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Available for download
Product Number:
51324-20623-SG
Author:
Clemence Rogier; Aymeric Lopitaux; Dominique Gauthier; Ahmed Fakhry; Sylvain Fontaine
Publication Date:
2024
$40.00
To assess and mitigate dynamic DC stray currents occurring on cathodically protected steel pipelines, the EN ISO 21857 standard was published in 2021. In this laboratory study, X70 steel ER probes buried in artificial soils under cathodic protection were submitted to anodic direct current influences. The impact on corrosion kinetics of anodic influences conditions was evaluated: triangular vs rectangular shape, anodic current densities from 0,1 to 10 A/m2, anodic period between 5 and 1800 s, and total anodic interference duration in one day from 0,5 to 10h. Soil environments were varied as well. More than 200 different test conditions were performed to better understand the parameters leading to a loss of metal. To complete this lab scale work, 8 on-site studies were performed as well. Real corrosion kinetics measured by corrosion probes were compared to corrosion risk prediction according to the new EN ISO 21857 standard. Pertinence of the criteria was demonstrated in this experimental study. It shows that to have the most precise prediction risk, reference levels such as defined by the standard (Eref and Jref) should be determined experimentally. In those conditions, 100% of real corrosion cases were predicted as such.
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