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07155 A Simple Method to Estimate Corrosion Rates and CP Penetration in Coating-Disbonded Regions on Buried Pipelines

Picture for 07155 A Simple Method to Estimate Corrosion Rates and CP Penetration in Coating-Disbonded Regions on
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Product Number: 51300-07155-SG
ISBN: 07155 2007 CP
Author: Fengmei Song and Narasi Sridhar
Publication Date: 2007
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This work reports two easily implementable, four-step procedures respectively to estimate corrosion potentials and rates in coating-disbonded regions based on measurable soil chemistry, lab-measured pipe steel open circuit potential (OCP) and corrosion rates in deaerated soil ground water and the CP potential near a holiday. This avoids the need for excavation, except as a confirmatory measure, while allows for the corrosion condition in a disbondment to be evaluated. This method can be used to estimate conservative but more realistic corrosion rates in the disbonded region. The corrosion rates thus obtained can be used to prioritize susceptible corrosion locations for excavation and determine more confidently reassessment interval. These simple procedures are not applicable for use to estimating growth rates of pits or cracks if they are present in the disbonded region.
This work reports two easily implementable, four-step procedures respectively to estimate corrosion potentials and rates in coating-disbonded regions based on measurable soil chemistry, lab-measured pipe steel open circuit potential (OCP) and corrosion rates in deaerated soil ground water and the CP potential near a holiday. This avoids the need for excavation, except as a confirmatory measure, while allows for the corrosion condition in a disbondment to be evaluated. This method can be used to estimate conservative but more realistic corrosion rates in the disbonded region. The corrosion rates thus obtained can be used to prioritize susceptible corrosion locations for excavation and determine more confidently reassessment interval. These simple procedures are not applicable for use to estimating growth rates of pits or cracks if they are present in the disbonded region.
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Picture for 07118 Chemistry and Corrosion Rates under Pipeline Disbonded Coatings With or Without Cathodic Prote
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07118 Chemistry and Corrosion Rates under Pipeline Disbonded Coatings With or Without Cathodic Protection

Product Number: 51300-07118-SG
ISBN: 07118 2007 CP
Author: Fengmei Song and Narasi Sridhar
Publication Date: 2007
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The transport of dissolved O2, and that of dissolved carbon dioxide (CO2) if present, into the disbonded region through holiday can be key to determining the disbonded corrosion rate. The evolution of chemistry in the disbonded region and the transient behavior of corrosion potential and rate in the disbonded region are investigated and reported in this work.
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07154 Pipeline Coatings, External Corrosion and Direct Assessment

Product Number: 51300-07154-SG
ISBN: 07154 2007 CP
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Picture for 98611 Corrosion Mitigation Under Disbonded
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