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Evaluation of Stray Current Interference of Thermally Insulated Pipelines in Real Soil Environments

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As using underground infrastructures, such as heat transport facilities continues for a long time, damage cases due to corrosion continue to occur. Therefore, it is essential to understand the corrosion behavior of underground metal facilities in terms of safety and economy. Many studies have been conducted on the corrosion of pipeline steels in soil.

Product Number: 51323-19229-SG
Author: Yoon-Sik So, Woo-Cheol Kim, Sin-Jae Kang, Jung-Gu Kim
Publication Date: 2023
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Direct electrochemical tests were conducted to evaluate the corrosion rate and interference of the stray current on district heating pipelines in real soil environments. The tests were conducted in three sites according to the soil environment (general, river nearby, and in stray current hazardous areas). Then, the effects of soil physical factors, including porosity and water content, on corrosion were evaluated using electrochemical tests. In addition, the stray current interference was quantified by measuring the corrosion potential of the pipeline steel in the real soil. The increased charge by stray current was calculated by comparing the stray current interference charge with the equilibrium state charge. Analyzing the corrosion rate measured in each site using linear polarization resistance and impedance electrochemical spectroscopy tests showed that the corrosion rate of pipeline steel was about 120 μm/year in the absence of stray current interference. However, when the interference of stray current was affected, the corrosion rate of pipeline steel is increased by 33.3% in the river nearby.

Direct electrochemical tests were conducted to evaluate the corrosion rate and interference of the stray current on district heating pipelines in real soil environments. The tests were conducted in three sites according to the soil environment (general, river nearby, and in stray current hazardous areas). Then, the effects of soil physical factors, including porosity and water content, on corrosion were evaluated using electrochemical tests. In addition, the stray current interference was quantified by measuring the corrosion potential of the pipeline steel in the real soil. The increased charge by stray current was calculated by comparing the stray current interference charge with the equilibrium state charge. Analyzing the corrosion rate measured in each site using linear polarization resistance and impedance electrochemical spectroscopy tests showed that the corrosion rate of pipeline steel was about 120 μm/year in the absence of stray current interference. However, when the interference of stray current was affected, the corrosion rate of pipeline steel is increased by 33.3% in the river nearby.

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