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Is Your CIS Data Accurate?

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Electrical potential surveys are typically required to be completed on a periodic basis on cathodically protected structures such as underground pipelines. However, proving that a cathodic protection system is providing the degree of corrosion protection required can often be a time-consuming and error prone endeavor. It is a typical practice, and often required, to interrupt the CP source(s) to carry out these surveys, the accuracy of which is affected by several factors, including the presence and inherent function of DC decouplers.

Product Number: 51322-17809-SG
Author: Jay Warner, Randy Hilgart
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
$0.00
$20.00
$20.00

Obtaining accurate polarized potentials (a.k.a. Instant-OFF potential) during an interrupted survey can be complicated by the introduction of a capacitance effect from DC decouplers in the circuit. Methods to obtain accurate polarized potentials in these scenarios exist, but there is some level of risk introduced to the pipeline and operating personnel. This paper will explain these existing methods, evaluate the level of risk associated with each and analyze a new technology that was developed for the purpose of improving data by providing accurate polarized potentials and avoids the risks or inaccuracies that other methods introduce. Field data will be presented to represent the performance of the new technology and compare it to having traditional decouplers in place.

The new technology reduces the time required for decoupler voltage to dissipate without having to disconnect the decouplers during an interrupted survey.

Obtaining accurate polarized potentials (a.k.a. Instant-OFF potential) during an interrupted survey can be complicated by the introduction of a capacitance effect from DC decouplers in the circuit. Methods to obtain accurate polarized potentials in these scenarios exist, but there is some level of risk introduced to the pipeline and operating personnel. This paper will explain these existing methods, evaluate the level of risk associated with each and analyze a new technology that was developed for the purpose of improving data by providing accurate polarized potentials and avoids the risks or inaccuracies that other methods introduce. Field data will be presented to represent the performance of the new technology and compare it to having traditional decouplers in place.

The new technology reduces the time required for decoupler voltage to dissipate without having to disconnect the decouplers during an interrupted survey.

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