Research on corrosion rate assessment of buried pipelines under dynamic metro stray current

2021 ◽  
Author(s):  
Yanxia Du ◽  
Huimin Qin ◽  
Jie Liu ◽  
Dezhi Tang
Keyword(s):  
Corrosion Rate ◽  
Buried Pipelines ◽  
Stray Current

scholarly journals Investigation of Corrosion Rate and Rust Expansion Form of Segment Reinforcement for Shield Tunnel by Combined Action of Soil Loading, Chloride Ion and Stray Current

2021 ◽  
Vol 13 (6) ◽  
pp. 3444
Author(s):  
Zheng Li ◽  
Hao Jin ◽  
Shuo Yu
Keyword(s):  
Corrosion Rate ◽  
Steel Corrosion ◽  
Chloride Ion ◽  
Shield Tunnel ◽  
Uniform Corrosion ◽  
Stray Current ◽  
Soil Loading ◽  
Capacity Degradation ◽  
Expansion Form ◽  
Combined Action

Segment reinforcement corrosion can cause bearing-capacity degradation of shield tunnel, which is unsafe for the metro operation. Therefore, a three-dimensional computational model was proposed in this paper to study the corrosion rate and rust expansion form of segment reinforcement by the combined action of soil loading, chloride ion and stray current. The results show that the arch waist segment steel corrosion rate in the middle is larger than the ends. The rust expansion form of segment reinforcement appears be an eccentric circle. The radius size and circular center are related to the non-uniform corrosion coefficient and the maximum corrosion current density.

scholarly journals Corrosion Rate of Iron Bipolar Electrode in Stray Current

1998 ◽  
Vol 66 (7) ◽  
pp. 745-749
Author(s):  
Izuru KOBAYASHI ◽  
Tsugunobu OHNO ◽  
Takeji OZAKI
Keyword(s):  
Corrosion Rate ◽  
Bipolar Electrode ◽  
Stray Current

scholarly journals Evaluation Model for the Scope of DC Interference Generated by Stray Currents in Light Rail Systems

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 746 ◽  
Author(s):  
Chengtao Wang ◽  
Wei Li ◽  
Yuqiao Wang ◽  
Shaoyi Xu ◽  
Kunpeng Li
Keyword(s):  
Surface Potential ◽  
Evaluation Model ◽  
Current Source ◽  
Electrochemical Corrosion ◽  
Potential Gradient ◽  
Light Rail ◽  
Buried Pipelines ◽  
Stray Current ◽  
Rail Systems ◽  
Transition Resistance

Electrochemical corrosion caused by stray currents reduces the lifespan of buried gas pipelines and the safety of light rail systems. Determining the scope of stray current corrosion will help prevent the corrosion of existing buried pipelines and provide an effective reference for new pipeline siting. In response to this problem, in this paper the surface potential gradient was used to evaluate the scope of stray current corrosion. First, an analytical model for the scope of the stray current corrosion combined with distributed parameters and the electric field generated by a point current source was put forward. Second, exemplary calculations were conducted based on the proposed model. Sensitivity of the potential gradient was analyzed with an example of the transition resistance, and the dynamic distribution of surface potential gradient under different locomotive operation modes was also analyzed in time-domain. Finally, the scope was evaluated at four different intervals with the parameters from the field test to judge whether the protective measures need to be taken in areas with buried pipelines and light rail systems nearby or not.

Corrosion rate estimation of stray current

2003 ◽  
Vol 2003.16 (0) ◽  
pp. 721-722
Author(s):  
Toshiyasu SHIMIZU ◽  
Kenji AMAYA
Keyword(s):  
Corrosion Rate ◽  
Stray Current ◽  
Rate Estimation

Effects of alternating stray current on the corrosion behaviours of buried Q235 steel pipelines

2017 ◽  
Vol 64 (6) ◽  
pp. 599-606 ◽  
Author(s):  
Yanbao Guo ◽  
Hai Tan ◽  
Deguo Wang ◽  
Tao Meng
Keyword(s):  
Corrosion Rate ◽  
Current Density ◽  
Corrosion Potential ◽  
Rapid Development ◽  
Geometrical Shape ◽  
Uniform Corrosion ◽  
Negative Deviation ◽  
Stray Current ◽  
Content Type ◽  
Ac Current

Purpose With the rapid development of rail transportation and energy-delivery systems, such as buried oil and gas pipelines and high-voltage transmission lines, the alternating current (AC) corrosion of buried steel pipelines is becoming more serious. This paper aims to study the corrosion behaviours of Q235 buried steel pipelines induced by the alternating stray current, with a set of indoor simulated experiment apparatuses. Design/methodology/approach The corrosion of the coating holidays of the buried steel pipelines at various AC current densities from 0 to 200 A/m2 in the soil-simulating environment was revealed by the electrochemical and weight-loss methods. Findings The results showed that the corrosion potential of the steel shifted negatively obviously and the corrosion rate of the steel increased with the increasing of AC current density. At a low AC current density, the negative deviation of the corrosion potential of the steel was small and the increase of corrosion rate was slight. However, the negative deviation of the corrosion potential was remarkable and the corrosion rate was greatly increased at a relative higher AC current density. The geometrical shape of the corrosion images indicated the corrosion forms changed from uniform corrosion to local corrosion due to the increase of AC interference. Originality/value Investigation results are of benefit to provide a new strategy to forecast and evaluate the AC-induced corrosion of the buried pipelines which could improve the safety of pipeline transportation.

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.

Study on interference and protection of pipeline due to high-voltage direct current electrode

2019 ◽  
Vol 37 (3) ◽  
pp. 273-281 ◽  
Author(s):  
Yang Chao ◽  
Li Jianliang ◽  
Li Zili ◽  
Zhang Shouxin ◽  
Dai Long ◽  
...  
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Cathodic Protection ◽  
Current Source ◽  
Buried Pipelines ◽  
Stray Current ◽  
Current Electrode ◽  
Protective Measures ◽  
High Voltage Direct Current ◽  
Pipe Section

AbstractTo study the rules of interference and protective measures on buried pipelines of high-voltage direct current (HVDC), the influence of different factors, including current into soil, soil resistance, damaged rate of coatings, and electrode-to-pipe distance, on pipe-to-soil potential deviation were simulated. Based on the simulated results, the fitted equations and interference judgment pattern were also obtained. The protective measures of insulation and cathodic protection can be performed for buried pipelines to prevent the interference, but the cathodic protection in the isolated area may become the stray current source of the other pipe section. This study can provide suggestions for the evaluation of interference and protective measures of pipelines of HVDC.

Investigation on corrosion rate and a novel corrosion criterion for gas pipelines affected by dynamic stray current

2015 ◽  
Vol 26 ◽  
pp. 453-460 ◽  
Author(s):  
Saeed Reza Allahkaram ◽  
Michael Isakhani-Zakaria ◽  
Mohammad Derakhshani ◽  
Masoud Samadian ◽  
Hojjat Sharifi-Rasaey ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Gas Pipelines ◽  
Stray Current
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