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51312-01370-Analysis of Metro Stray current Interference on Underground Pipelines with a SACP system by Field Te

Picture for Analysis of Metro Stray current Interference on Underground Pipelines with a SACP system by Field Te
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Product Number: 51312-01370-SG
ISBN: 01370 2012 CP
Author: Liang Dong
Publication Date: 2012
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In cities stray current interference on underground pipelines caused by metro systems may be a serious issue due to their construction and limited urban space. The sacrificial anode cathodic protection (SACP) system usually used as an external corrosion control method for the city gas pipelines because of its convenient management was considered to be somewhat effective in mitigating the stray current interference. In this work metro stray current interference on underground pipelines with a SACP system was studied and factors affecting stray current interference such as isolation joints sacrificial anodes coating qualities grounding systems and soil resistivity were analyzed by field tests and numerical simulation. The results showed that the lower anode-to-earth resistance of sacrificial anodes and grounding systems made them picking up a great amount of stray current and the interference could be worse. The effects of increasing isolation joints and installing switches like diodes between anodes and pipelines were also considered and the results indicated that those were good ways to mitigate such interference.
In cities stray current interference on underground pipelines caused by metro systems may be a serious issue due to their construction and limited urban space. The sacrificial anode cathodic protection (SACP) system usually used as an external corrosion control method for the city gas pipelines because of its convenient management was considered to be somewhat effective in mitigating the stray current interference. In this work metro stray current interference on underground pipelines with a SACP system was studied and factors affecting stray current interference such as isolation joints sacrificial anodes coating qualities grounding systems and soil resistivity were analyzed by field tests and numerical simulation. The results showed that the lower anode-to-earth resistance of sacrificial anodes and grounding systems made them picking up a great amount of stray current and the interference could be worse. The effects of increasing isolation joints and installing switches like diodes between anodes and pipelines were also considered and the results indicated that those were good ways to mitigate such interference.
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