Earth gradient measurements were used to assess the need to re-insulate the embedded track of an electric light rail where the light rail crosses a buried water supply conduit. The rail was found to have significant stray current corrosion and re-insulating the track was shown to be an effective corrosion control measure. During retrofit of the track, a coupon test station was installed on the pipe; the coupon test station enabled better assessment of the pipe than was possible with only earth gradient measurements.

Subject
Electric current, CP coupons, Rail, Substations, Water, Piping, Insulation, Voltage, Pipe to soil potential, Steel coupons, Stray current, Corrosion coupons, Soil
Keywords:
stray current, electric light rail, coupon test stations, earth gradient measurements
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2007
GOV
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