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Obtaining The Polarized Potential Under AC Interference

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The -850 mV (CSE) criterion refers to the polarized pipeline potential that is free of any IR-drop. Different methods to obtain the polarized potential exist. Interruption of the CP current will cause the current, I, and thus the IR-drop to become zero and the remaining polarization immediately after the interruption is representative of the polarized potential of the pipeline.

Product Number: 51322-17634-SG
Author: Andreas Junker Olesen, Lars Vendelbo Nielsen
Publication Date: 2022
Industry: Pipelines, Tanks, and Underground Systems
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$20.00

Obtaining the polarized potential (off potential / instant-off potential / IR compensated potential) of a pipeline is considered extremely difficult, if not impossible, when the pipeline is interfered by an alternating voltage, and particularly if the pipeline is fitted with capacitive AC mitigation devices. Yet, a number of procedures exists to obtain information on the polarized potential, due to its importance in cathodic protection operation. Two distinct approaches are measurements on the structure/pipeline itself, and measurements on coupons. While it can be agreed that the structure measurement is challenging, some believe that the coupon method is error-free, as the AC interference is not present on a disconnected coupon. This paper will illustrate that this is not entirely true. Some of the present challenges and some of the approaches to get meaningful measurements are presented.

Obtaining the polarized potential (off potential / instant-off potential / IR compensated potential) of a pipeline is considered extremely difficult, if not impossible, when the pipeline is interfered by an alternating voltage, and particularly if the pipeline is fitted with capacitive AC mitigation devices. Yet, a number of procedures exists to obtain information on the polarized potential, due to its importance in cathodic protection operation. Two distinct approaches are measurements on the structure/pipeline itself, and measurements on coupons. While it can be agreed that the structure measurement is challenging, some believe that the coupon method is error-free, as the AC interference is not present on a disconnected coupon. This paper will illustrate that this is not entirely true. Some of the present challenges and some of the approaches to get meaningful measurements are presented.

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