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High Sensitive Sensors for Collection of Cathodic Polarization Data and Determination of Protection Potential Criteria of Buried Structures

Picture for High Sensitive Sensors for Collection of Cathodic Polarization Data and Determination of Protection Potential Criteria of Buried Structures
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The installation of metallic coupons in the vicinity of buried pipes under cathodic protection (CP) allows theoretically to measure the potential and the current density through the simulated coating defect. Nevertheless this type of monitored coupon does not provide direct information on the actual efficiency of the CP and corrosion rates that could be caused by a CP failure over time or not adapted CP design. According to the soil resistivity and the corrosion potential in absence of CP a protection potential is generally targeted following the standard recommendations. However the soil resistivity as well as the corrosion potential might depend on the seasonal fluctuations and the protection potential might vary as function of the considered standard. Moreover all soils parameters cannot be considered in recommendations from standards and cathodic protection criteria can be sometimes debatable.In this study very sensitive electrical resistance (ER) sensors allowing obtaining precise corrosion data in real-time were adapted for soil applications. They were used in the selected soils and conditions to determine the off potential and current density corresponding to a corrosion rate of 10 µm/year which corresponds to the maximal corrosion rate of buried structures considered as protected according the standard ISO 15589-1:2015. The adapted ER sensors appeared to be particularly suitable for determining the protection potential and CP criteria in a relatively short time. For the tested soils and conditions the results showed that the cathodic protection criteria recommended in ISO 15589-1: 2015 are conservative compared to those measured experimentally. This method therefore seems particularly relevant for the determination of the protection potential in complex or polluted media in the absence of data in the literature.

Product Number: 51319-12896-SG
Author: Erwan Diler
Publication Date: 2019
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$20.00
$20.00
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Picture for Study of Cathodic Protection in Soils with the Use of Specific Coupons
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51316-7228-Study of Cathodic Protection in Soils with the Use of Specific Coupons

Product Number: 51316-7228-SG
ISBN: 7228 2016 CP
Author: Jean Vittonato
Publication Date: 2016
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Repeated cyclic potentiodynamic polarization (CPP) measurements were performed in different environments for both carbon steel and Type 304L stainless steel. The effect of different environmental species, nitrite and hydroxide on repassivation/reactivation mechanism of carbon steel is examined.

 
Picture for 98672 THE USE OF COUPONS FOR MONITORING
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98672 THE USE OF COUPONS FOR MONITORING THE CATHODIC PROTECTION OF BURIED STRUCTURES

Product Number: 51300-98672-SG
ISBN: 98672 1998 CP
Author: K. M. Lawson, N. G. Thompson
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Picture for Cathodic Protection Coupon Use for Buried Piping in Plant (i.e. Complex) Facilities
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Cathodic Protection Coupon Use for Buried Piping in Plant (i.e. Complex) Facilities

Product Number: 51317--8824-SG
ISBN: 8824 2017 CP
Author: Douglas Gilroy
Publication Date: 2017
$20.00

Measurement and interpretation of cathodic protection data in plant facilities present challenges where mixed metals are electrically continuous with the protected structure. This paper address some of the confusion and important aspects when using coupons for buried piping in mixed-metal circuits.
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