Method for diagnosis of the effect of AC on the X70 pipeline due to an inductive coupling caused by HVPL

Ouadah, M.; Touhami, O.; Ibtiouen, R.; Zergoug, M.

doi:10.1049/iet-smt.2016.0519

Cited by 16 publications

(8 citation statements)

References 41 publications

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“…Moreover, the application of CP can significantly change the electrolyte composition in proximity to the coating defect and consequently the local soil resistivity. The formula is valid when the coating defect size is larger than the coating thickness, although rigorous calculations are available [13]. The current density can only be estimated by means of coupons or probes.…”

Section: Ac Densitymentioning

confidence: 99%

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AC Corrosion of Carbon Steel under Cathodic Protection Condition: Assessment, Criteria and Mechanism. A Review

2020

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Cathodic protection (CP), in combination with an insulating coating, is a preventative system to control corrosion of buried carbon steel pipes. The corrosion protection of coating defects is achieved by means of a cathodic polarization below the protection potential, namely −0.85 V vs. CSE (CSE, copper-copper sulfate reference electrode) for carbon steel in aerated soil. The presence of alternating current (AC) interference, induced by high-voltage power lines (HVPL) or AC-electrified railways, may represent a corrosion threat for coated carbon steel structures, although the potential protection criterion is matched. Nowadays, the protection criteria in the presence of AC, as well as AC corrosion mechanisms in CP condition, are still controversial and discussed. This paper deals with a narrative literature review, which includes selected journal articles, conference proceedings and grey literature, on the assessment, acceptable criteria and corrosion mechanism of carbon steel structures in CP condition with AC interference. The study shows that the assessment of AC corrosion likelihood should be based on the measurement of AC and DC (direct current) related parameters, namely AC voltage, AC and DC densities and potential measurements. Threshold values of the mentioned parameters are discussed. Overprotection (EIR-free < −1.2 V vs. CSE) is the most dangerous condition in the presence of AC: the combination of strong alkalization close to the coating defect due to the high CP current density and the action of AC interference provokes localized corrosion of carbon steel.

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Section: Ac Densitymentioning

confidence: 99%

“…Materials 2020, 13 Büchler in 2012 [61] and previously in 2009 [22] investigated new protection criteria based on laboratory and field investigations. For current density average values measured by means of on-site coupons, one of the criteria below must be met (Figure 7):…”

Section: Acceptable Ac Interference Levels-protection Criteriamentioning

confidence: 99%

AC Corrosion of Carbon Steel under Cathodic Protection Condition: Assessment, Criteria and Mechanism. A Review

2020

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“…A practical case study was performed in [15] to estimate the inductive interference caused by coupling between high voltage transmission lines and buried pipelines. Additionally, the effects of the induced AC voltage on corrosion and the CP performance of an X70 steel buried pipeline was investigated.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the KOH-Polarization cells for mitigating the induced AC voltage in the metallic pipelines

Al‐Gabalawy

Mostafa

Hamza

et al. 2020

Heliyon

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The problem of AC corrosion remains motivating for researchers because many factors influence the corrosion rate for buried pipelines due to the interference with overhead high voltage transmission lines (OHVTLs). Many researchers study the mechanisms of induced alternating current (AC) voltages, which are summarized as capacitive, inductive, and conductive coupling. In this work, only the induced AC voltage on the pipelines due to inductive coupling in steady-state conditions is studied. A holistic mathematical model for the pipelines, power lines, mitigation equipment for the induced voltage, and cathodic protection (CP) is illustrated. Potassium hydroxide polarization cells are electrically represented because these cells are considered the most common mitigation device for discharging the induced AC voltage from the pipeline to the soil. The overall model is implemented using MATLAB. The results show the profiles of induced AC voltage along the pipeline, the CP for the pipeline, the points of maximum voltage, and the influence of installing the AC mitigation units on the CP performance.

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“…Conductive coupling generates through the ground voltage rise produced by discharging a very high amount of current into the soil at power system constructions, particularly at the grounding systems of high voltage overhead transmission lines. The conductive coupling is one of the main interests during power system faults, especially when the metallic pipelines are located close to the high voltage transmission line [3]. Commonly, inductive coupling is produced through magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of electrical hazards on the metallic pipelines due to the HVOHTLs based on different intelligent controllers

Al‐Gabalawy

Mostafa

Hamza

2020

IET Science, Measurement &Amp; Technology

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Many catastrophes may occur due to the interference between the metallic pipeline and the high voltage overhead transmission lines (HVOHTLs). These problems exist due to the neighbouring between the HVOHTLs and the other infrastructures. Many types of research cover cathodic protection points, detailed description for the production of the AC voltage, and preliminary mitigation ways. Mainly potassium hydroxide-polarisation cells (KOH-PCs) have been applied to discharge this voltage to the soil. Based on the KOH-PCs electrical model introduced previously, this study investigates a novel mitigation technique, where the discharged AC voltage converts to DC voltage that is proper for the cathodic protection for the metallic pipelines. An integrated system consists of power electronic circuits and distributed intelligent controllers designed to discharge the AC induced voltage and use in the cathodic protection for the pipelines. Different controllers such as the artificial neural network, a fuzzy logic controller, and adaptive neuro-fuzzy inference system controllers have been implemented. Two key performance indicators have been investigated to show the superiority of these controllers, where the total discharged energy per annum DE year from the pipeline to the soil, and the total saved per year SE year .

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Method for diagnosis of the effect of AC on the X70 pipeline due to an inductive coupling caused by HVPL

Cited by 16 publications

References 41 publications

AC Corrosion of Carbon Steel under Cathodic Protection Condition: Assessment, Criteria and Mechanism. A Review

AC Corrosion of Carbon Steel under Cathodic Protection Condition: Assessment, Criteria and Mechanism. A Review

Modeling of the KOH-Polarization cells for mitigating the induced AC voltage in the metallic pipelines

Mitigation of electrical hazards on the metallic pipelines due to the HVOHTLs based on different intelligent controllers

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