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98675 Principles Underlying the Method of Determining the True Potentials on Cathodically Protected Underground Steel Pipelines

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Product Number: 51300-98675-SG
ISBN: 98675 1998 CP
Author: J.C. Marec
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ON potentials taken at the ground surface of cathodically protected underground pipelines are plagued with errors due to numerous factors, in particular the gradient of the potential in the ground. The method most commonly used today to partially correct these errors is the measurement of OFF potentials. This method, however, does not allow one to obtain readings of potentials that reflect, under all circumstances, the actual level of polarization of the pipeline metal in contact with the soil. This is the case, for example, when stray currents are present or when pipelines are buried in high resistance soils. The erroneous measurement of potentials can have serious long-term consequences since corrosion can occur on structures that are not within a safe range of corrosion protection levels. The Centre Technique Operationnel (Technical Operations Centre) of Gaz de France has developed a new method for measuring potentials based on the modelling of the change in potential as a function of rectifier output current. This method allows one to obtain potentials that are close to true values in the majority of cases and is one of the means of diagnosing a network’s corrosion potential.
ON potentials taken at the ground surface of cathodically protected underground pipelines are plagued with errors due to numerous factors, in particular the gradient of the potential in the ground. The method most commonly used today to partially correct these errors is the measurement of OFF potentials. This method, however, does not allow one to obtain readings of potentials that reflect, under all circumstances, the actual level of polarization of the pipeline metal in contact with the soil. This is the case, for example, when stray currents are present or when pipelines are buried in high resistance soils. The erroneous measurement of potentials can have serious long-term consequences since corrosion can occur on structures that are not within a safe range of corrosion protection levels. The Centre Technique Operationnel (Technical Operations Centre) of Gaz de France has developed a new method for measuring potentials based on the modelling of the change in potential as a function of rectifier output current. This method allows one to obtain potentials that are close to true values in the majority of cases and is one of the means of diagnosing a network’s corrosion potential.
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