Study on location of reference electrode for measurement of induced alternating current voltage on pipeline

Tang, Dezhi; Du, Yanxia; Lu, Minxu; Chen, Shaosong; Jiang, Zi‐Tao

doi:10.1002/etep.1827

Cited by 6 publications

(7 citation statements)

References 15 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Alternating current (AC) corrosion of buried metallic pipelines has attracted much attention in recent decades. The early work on this topic was mainly concentrated on the factors that affected AC corrosion rate, the mechanisms by which AC induced corrosion occurs, the mitigation methods , as well as the detecting techniques in the case of no cathodic protection (CP). In recent years, more and more research has been conducted to investigate AC corrosion of buried metallic pipelines when CP is applied.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH value on corrosion of carbon steel under an applied alternating current

Tang

et al. 2015

Materials & Corrosion

View full text Add to dashboard Cite

In this work, corrosion behavior of carbon steel under the application of alternating current (AC) was investigated in electrolyte solutions with five different pH levels, from near-neutral to alkaline condition, through weight loss measurements, potential monitoring techniques, potentiodynamic polarization tests, electrochemical impedance spectroscopy (EIS) tests, and surface examination. It is found that the corrosion rate of carbon steel decreases with increasing pH value toward the alkaline end while increases with increasing AC current density. When the solution pH becomes highly alkaline, say, 12, passivation occurs on carbon steel surfaces, with an enlarging passive region as pH increases. However, it is worth noting that the passive film suffers from mechanical breakdown when the applied AC current density reaches a critical level. Based on these results, an AC corrosion mechanism of carbon steel in near-neutral and alkaline environment is proposed.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of pH value on corrosion of carbon steel under an applied alternating current

Tang

et al. 2015

Materials & Corrosion

View full text Add to dashboard Cite

show abstract

“…In a recent work, Tang et al [8] investigate the effects of several parameters on the electric field distribution of AC interference, such as the unbalanced current magnitude, soil and coating resistivity and the distance between the power line and the pipeline. By means of numerical simulation, the authors conclude that the reference electrode should be placed farther from the pipeline route with the increase of mitigation wire length, soil resistivity and the distance between the power line and the structure; conversely, the earth remote position is closer to the pipe by increasing coating resistivity if mitigation is applied [8].…”

Section: Ac Voltagementioning

confidence: 99%

“…Contrary to the AC voltage measurement, the AC density, i AC , cannot be readily determined. The numerical approach considers the calculation of AC density from the AC voltage, the soil resistance, ρ, and the diameter, φ, of a circular coating defect, according to the following equation, as reported in [8][9][10][11][12]:…”

Section: Ac Densitymentioning

confidence: 99%

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

2020

View full text Add to dashboard Cite

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.

show abstract

“…The effect of soil structure on the conductive and inductive interferences is described by many previously published work. Despite of the existence of many published works, such as those described in [17,18], the effects of soil structure are still being studied. The importance of considering an accurate soil structure, when computing the TL-human body interference level, and when designing a mitigation system against high induced voltage for the pipeline, is described in [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Power transmission lines electromagnetic pollution with consideration of soil resistivity

Elgayar¹,

Abdul‐Malek²,

Othman³

et al. 2019

TELKOMNIKA

View full text Add to dashboard Cite

The alternating current (AC) total interference of power lines may pose a threat to personnel and equipment in its vicinity. The main objective of this work is to determine the electromagnetic distribution and induced voltages on human body, equipment, and houses due to the AC total interference for different soil resistivities. The electromagnetic field and induced voltages may cause health problems to the human body and put it at risk. Two main approaches were used to compute the electromagnetic and induced voltages, namely the field approach, which is based on electromagnetic field distribution, and the circuit approach, which uses the circuit grounding analysis to compute the conductive interference and then uses the circuit based models to compute the inductive interference. Human body, steel houses and 10-km-long transmission line were modelled. The soil resistivity was varied, and the induced voltages obtained from both approaches were compared. Soil resistivity and soil structure are important parameters that affect the AC interference level. The results show that the touch voltage increases when the distance between electromagnetic source and human body increases. For high soil resistivity, the danger of the touch voltage becomes more prominent compared to that for low soil resistivity. Power system voltage level and soil resistivity are two key factors influencing the induced voltage level.

show abstract

Study on location of reference electrode for measurement of induced alternating current voltage on pipeline

Cited by 6 publications

References 15 publications

Effect of pH value on corrosion of carbon steel under an applied alternating current

Effect of pH value on corrosion of carbon steel under an applied alternating current

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

Power transmission lines electromagnetic pollution with consideration of soil resistivity

Contact Info

Product

Resources

About