Case study of corrosion failure of urban water supply system caused by the harmful effects Received 5 November 2015 of stray currents was presented. The failure occurred at a site distant from the sources of Received in revised form 1 February 2016 Accepted 18 March 2016 Available online 24 March 2016 these currents namely the tramway and railway traction systems. Diagnosis revealed the stray currents flow to pipeline over a remote distance of 800/1000 m from the point of failure. At the point of failure stray currents flowed from the pipeline to the ground through external insulation defects, causing the process of electrolytic corrosion of the metal. Long distance between the affected section of the pipeline and the sources of stray currents excludes the typical protection against stray currents in the form of electrical polarized.
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