scholarly journals Research Progress on Soil Resistivity Affecting Stray Current Corrosion of Buried Pipeline

2015 ◽  
Vol 05 (10) ◽  
pp. 123-130
Author(s):  
琼 封
Keyword(s):  
Research Progress ◽  
Buried Pipeline ◽  
Stray Current ◽  
Soil Resistivity

Situation and Development on Soil Corrosion of Metallic Materials of HVDC Power Transmission Project

2016 ◽  
Vol 852 ◽  
pp. 218-225 ◽  
Author(s):  
An Xiang Guo ◽  
Wei Juan Hu ◽  
Ai Jun Yan ◽  
Zhi Qiang Yang ◽  
La Jun Feng
Keyword(s):  
High Power ◽  
Power Transmission ◽  
Research Direction ◽  
Research Progress ◽  
Metallic Materials ◽  
Buried Pipeline ◽  
Stray Current ◽  
Soil Corrosion ◽  
Hvdc System ◽  
Corrosion Research

UHVDC transmission could deliver high-power electricity over long distances effectively, while the DC stray current led to corrosion of grounding device and the surrounding buried metal during the operation inevitably. This paper reviewed the research progress of HVDC corrosion at home and abroad in recent years. It elaborated corrosion research direction of HVDC system from three aspects, which were pole, grounding grid and the neighboring tower grounding body buried pipeline respectively. Describing the anti-corrosion measures on grounding devices and buried pipeline, and explaining the advantages and defects of various anti-corrosion technology. At last, we proposed that it was necessary to expand the research in UHVDC field, grasp the erosion rule of DC stray current in soil comprehensively to enhance the security of UHVDC transmission system of national grid.

Fundamental Aspects of Stray Current Corrosion on Buried Pipeline

2010 ◽  
Vol 146-147 ◽  
pp. 70-74 ◽  
Author(s):  
Qing Jun Zhu ◽  
Alin Cao ◽  
Zai Feng Wang ◽  
Ji Wen Song ◽  
Sheng Li Chen
Keyword(s):  
Laboratory Study ◽  
Buried Pipeline ◽  
Boundary Values ◽  
Stray Current ◽  
Soil Resistivity ◽  
Current Densities ◽  
Pipeline Failure ◽  
Pipeline Design ◽  
Depth Horizon

Stray current is one of the main reasons in pipeline failure. In pipeline design and maintenance, it is important to know the fundamentals influencing stray current corrosion. However, it is difficult to control stray currents because many factors can affect its inflow points, outflow points and current densities. Several fundamental aspects, such as soil resistivity, coating worn rate, buried depth and horizon distance have been studied in order to find useful information in pipeline design. The results show stray current can be influenced by soil resistivity, coating worn rate and buried depth. It is suitable to control stray current corrosion by increasing soil resistivity, buried depth, horizon distance and decreasing coating worn rate. However, there are boundary values in controlling stray current corrosion by increasing soil resistivity, buried depth and horizon distance. For example, in this laboratory study, the boundary horizon distance is 200mm.

An Array of Multielectrodes for Locating, Visualizing, and Quantifying Stray Current Corrosion

CORROSION ◽  
10.5006/2828 ◽  
2018 ◽  
Vol 74 (10) ◽  
pp. 1093-1101 ◽  
Author(s):  
Ke Wang ◽  
Facundo Bob Varela ◽  
Mike Yongjun Tan
Keyword(s):  
Cathodic Protection ◽  
Laboratory Simulation ◽  
Buried Pipeline ◽  
Stray Current ◽  
Simulation Experiments ◽  
Corrosion Rates ◽  
Pipeline Corrosion ◽  
Probe Array

An array of multielectrode corrosion probes, designed based on a series of coupled wire beam electrodes (WBEs), has been devised as a new tool for locating, visualizing, and quantifying the effects of stray currents on buried pipeline corrosion. It has been demonstrated in laboratory simulation experiments that this WBE probe array is capable of detecting stray current corrosion affected sites along a pipeline, visualizing stray current corrosion patterns and corrosion rates, and evaluating the efficiency of cathodic protection against stray current corrosion. Based on these results, two applications of this WBE probe array have been proposed for stray current corrosion survey and monitoring.

scholarly journals Inferring highly corroded buried pipeline locations through saturated soil resistivity information

2021 ◽  
Author(s):  
Ravin N Deo ◽  
Rukshan Azoor ◽  
Guoyang Fu ◽  
Benjamin Shannon ◽  
Jayantha Kodikara
Keyword(s):  
Saturated Soil ◽  
Buried Pipeline ◽  
Soil Resistivity

scholarly journals Numerical modelling of buried pipelines under DC stray current corrosion

2019 ◽  
Vol 9 (2) ◽  
pp. 125-134 ◽  
Author(s):  
Yaping Zhang ◽  
Qiong Feng ◽  
Lianqing Yu ◽  
Chi-Man Lawrence Wu ◽  
Siu-Pang Ng ◽  
...  
Keyword(s):  
Environmental Problem ◽  
Three Dimensional ◽  
Corrosion Process ◽  
Comsol Multiphysics ◽  
Buried Pipelines ◽  
Stray Current ◽  
Soil Resistivity ◽  
Intensity Changes ◽  
Dimensional Equation ◽  
Corrosion Mechanisms

Corrosion of buried pipelines caused by stray currents is becoming a serious industrial and environmental problem. It is therefore necessary to study corrosion mechanisms of buried pipelines under DC stray currents in order to propose effective anti-corrosion measures. Since measurement of the potential is one of important ways to identify stray current intensity, the COMSOL Multiphysics software was used to simulate stray current corrosion dynamics of buried pipelines. It was also used to calculate the distribution and intensity changes of electrolyte potential in the cathodic protected system by solving Laplace’s three-dimensional equation. The obtained results showed that increased applied voltage leads to more positive shift of a pipeline potential, resulting in acceleration of stray current corrosion. On the contrary, increased soil resistivity can retard the corrosion process. The protected pipeline with a sacrificial anode suffers less corrosion interference than unprotected pipeline. Two crossed arrangement of pipelines makes no difference in corrosion of protected pipeline, but affects greatly on unprotected pipeline.

Research and Application of Portable Real Protection Potential Measurement System of Buried Steel Pipeline

2012 ◽  
Vol 605-607 ◽  
pp. 1042-1045
Author(s):  
Xue Fen Zhao
Keyword(s):  
Reference Electrode ◽  
Buried Pipeline ◽  
Stray Current ◽  
Potential Measurement ◽  
Ir Drop ◽  
Surface Data ◽  
Electrode Method ◽  
Protection Potential ◽  
Data Acquisition Unit ◽  
Ground Potential

The measurement of pipeline to ground potential is the most common method to evaluate protection condition of buried pipeline. For the old pipeline, pipeline to ground potential measured with surface reference electrode method or reference electrode method close to pipeline usually is not the real protection potential of buried pipeline due to presence of an IR drop and/or stray current interference. A portable real protection potential measurement system combining the polarized probe with the portable surface data acquisition unit is developed, the polarized probe can measure the real protection potential by eliminating IR drop and/or stray current interference, meanwhile portable surface data acquisition unit can automatically record protection potential. The on-site application of the system show that the system can quickly and accurately measure the protective potential of buried pipeline, reduce human measurement error, and really reflect the cathodic protection condition of pipeline.

scholarly journals Study on Distribution Characteristics of Metro Stray Current and Evaluation of Cumulative Corrosion Effect

2022 ◽  
Vol 2022 ◽  
pp. 1-12
Author(s):  
Shan Lin ◽  
Jing Zhang ◽  
Xuehua Liu ◽  
Xianwei Zhang ◽  
Zhichao Cai ◽  
...  
Keyword(s):  
Finite Element ◽  
Current Distribution ◽  
Element Model ◽  
Distribution Model ◽  
Distribution Characteristics ◽  
Buried Pipeline ◽  
Stray Current ◽  
Power Sources ◽  
Quantitative Calculation ◽  
Pipeline Corrosion

Stray current directly affects the regular operation of electrical equipment and facilities in the subway DC traction power supply system. Therefore, it is worthwhile to study the stray current distribution characteristics during train operation and the quantitative corrosion of buried pipelines. This paper introduces the traction characteristics of power carriages and power wheelsets of subway vehicles into the DC traction process. A finite element model considering the dynamic distribution of stray current under the actual operation of subway vehicles is established. The interference characteristics of stray current and the contribution of power sources under the multiparticle model are analyzed. The rail insulation damage caused by long service time and the quantitative calculation of rail and buried pipeline corrosion is considered. The model results show that the stray current in the buried pipeline under the multiparticle model is more accurate and more suitable for the protection in the actual subway. The quantitative corrosion of the buried pipeline is stronger than the partial insulation damage environment when the rail is not insulated. The rail and buried pipeline corrosion at both ends of the insulation damage position is relatively severe. The stray current distribution model established in this paper gives full play to the solution advantages of the finite element method and provides a new idea for the quantitative calculation of buried pipeline corrosion.

Study on AC Stray Current Corrosion Law of Buried Steel Pipelines

2012 ◽  
Vol 263-266 ◽  
pp. 448-451 ◽  
Author(s):  
Xin Hua Wang ◽  
Guo Yong Yang ◽  
Hai Huang ◽  
Zhenhua Chen ◽  
Li Mei Wang
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Current Density ◽  
Transmission Lines ◽  
Buried Pipelines ◽  
Safe Operation ◽  
Stray Current ◽  
Soil Resistivity ◽  
Ac Current ◽  
The Impact

AC stray current can cause AC corrosion and destroy the safe operation of buried pipelines, which comes mainly from nearby high voltage transmission lines and AC electric railway. The research and evaluation lags far behind DC stray current at home and abroad, besides, the AC current density measuring procedures are complex. Through experimental study of different parameters on the impact of the AC current density established a mathematical model of damaged area, soil resistivity, pipe-to-soil potential and coating resistivity. With it can indirectly get the AC current density, which improve efficiency by simplifying the measuring procedures. Also, provide a basis for harmfulness evaluation of AC stray current by studying the impact of AC current density on the corrosion rate.

Distribution of Stray Current in Buried Pipeline

2012 ◽  
Vol 433-440 ◽  
pp. 6579-6582
Author(s):  
Qing Jun Zhu ◽  
Alin Cao ◽  
Ji Wen Song ◽  
Sheng Li Chen
Keyword(s):  
Electric Field ◽  
Electrochemical Corrosion ◽  
Potential Gradient ◽  
Simulation System ◽  
Current Intensity ◽  
Buried Pipeline ◽  
Stray Current ◽  
In The Beginning

Electrochemical corrosion happens when stray currents leak out of buried pipeline. This will threaten the safety of pipeline operation and operators. The distribution of stray current was studied by simulation system. The results indicate that stray current intensities have the same distribution with potential gradient Esx which parallel to the metallic pipeline. The distribution curves of stray current show regular symmetry. The stray currents increase gradually along the buried metallic pipeline. It reaches maximum at the pipeline midpoint. The potential gradient Esy distribution curves in y-direction show a hyperbolic shape. For the exits of faradic electric field, stray current intensity is maximum in the beginning and it flows into the pipeline. It flow along the pipeline and parallel to the pipeline at middle. After that, the stray currents begin to flow back to cathode and the stray current intensity reaches maximum at the end of pipeline.

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