Abstract
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.
Highlights
Of the strayOn currents of the lightwhen rail system in are to be embedded around a light rail system, it is necessary to consider the range of influence of the the vicinity of the gas pipes, to determine the suitable embedding position and minimize the corrosion stray of currents ofcurrent the light systemgas in pipelines
The main objective of this paper is to provide potential gradient is chosen as a parameter to characterize the DC interference scope, which aisscope easy model of the interference evaluated by the surface potentialmodel gradient
The model is used to judge whether the area around the light rail system is influenced by the stray current corrosion or not using the surface potential gradient
Summary
Of the strayOn currents of the lightwhen rail system in are to be embedded around a light rail system, it is necessary to consider the range of influence of the the vicinity of the gas pipes, to determine the suitable embedding position and minimize the corrosion stray of currents ofcurrent the light systemgas in pipelines. Based on these reasons, the researchthe on suitable the DC embedding position and minimize the corrosion effect of the stray current on the buried gas pipelines.
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