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08145 Predicting Pipeline Corrosion under Disbonded Coatings with the Influence of Slow Flow Underneath

Picture for 08145 Predicting Pipeline Corrosion under Disbonded Coatings with the Influence of Slow Flow Underne
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Product Number: 51300-08145-SG
ISBN: 08145 2008 CP
Author: Fengmei Song and Narasi Sridhar
Publication Date: 2008
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$20.00
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Laboratory and field experience revealed increased corrosion rate of pipeline steel under disbonded coatings when aerated water flows underneath. The quantitative effect of the flow velocity was simulated in this work through mathematical modeling. The simulation included mass transport, fluid flow and electrochemical reactions. Following analysis of the simulation results, simple algorithms have been developed which reproduce the detailed modeling results with certain conservatism. The significance of flow velocity and disbondment gap to the corrosion rate is clearly demonstrated in the algorithms. The difficulties confronted with field application of these algorithms are the actual field flow velocity in the disbonded region and the size of the disbondment gap, which cannot be easily known. This velocity may however be estimated from ground water flow velocity in the soil near the disbondment.
Laboratory and field experience revealed increased corrosion rate of pipeline steel under disbonded coatings when aerated water flows underneath. The quantitative effect of the flow velocity was simulated in this work through mathematical modeling. The simulation included mass transport, fluid flow and electrochemical reactions. Following analysis of the simulation results, simple algorithms have been developed which reproduce the detailed modeling results with certain conservatism. The significance of flow velocity and disbondment gap to the corrosion rate is clearly demonstrated in the algorithms. The difficulties confronted with field application of these algorithms are the actual field flow velocity in the disbonded region and the size of the disbondment gap, which cannot be easily known. This velocity may however be estimated from ground water flow velocity in the soil near the disbondment.
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