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09132 DCVG – Analysis of Practical Limits and Suggestions for Improvements

Picture for 09132 DCVG – Analysis of Practical Limits and Suggestions for Improvements
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Product Number: 51300-09132-SG
ISBN: 09132 2009 CP
Author: Peter-John Stehouwer, Leslie Bortels, Kees Dijkstra
Publication Date: 2009
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Failures in oil or gas pipelines can have severe environmental and economic consequences. Therefore, large investments have been made in studies on corrosion prevention for buried and submerged pipes. Important research is being conducted to determine and predict corrosion mechanisms in the electrolyte and to develop effective protection techniques for buried and submerged metallic structures.

Protective coatings offer a first barrier against corrosion. However, damage of the coating duringinstallation and coating degradation can result in severe corrosion and necessitate the installationof properly designed cathodic protection (CP) systems. When designing a cathodic protectionsystem, the aim is to obtain a pipe-to-soil potential (P\S) along the entire length of the pipelinenetwork that is more negative than a certain minimum protection level [1]. This is achieved bydriving sufficient protective current in the electrolyte (soil, seawater, …) that mainly flowstowards coating defects exposing bare steel. The resulting voltage gradients in the electrolyte canbe measured at the surface and are the common basis for several coatingsurvey techniques.
Failures in oil or gas pipelines can have severe environmental and economic consequences. Therefore, large investments have been made in studies on corrosion prevention for buried and submerged pipes. Important research is being conducted to determine and predict corrosion mechanisms in the electrolyte and to develop effective protection techniques for buried and submerged metallic structures.

Protective coatings offer a first barrier against corrosion. However, damage of the coating duringinstallation and coating degradation can result in severe corrosion and necessitate the installationof properly designed cathodic protection (CP) systems. When designing a cathodic protectionsystem, the aim is to obtain a pipe-to-soil potential (P\S) along the entire length of the pipelinenetwork that is more negative than a certain minimum protection level [1]. This is achieved bydriving sufficient protective current in the electrolyte (soil, seawater, …) that mainly flowstowards coating defects exposing bare steel. The resulting voltage gradients in the electrolyte canbe measured at the surface and are the common basis for several coatingsurvey techniques.
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