Tuesday, March 18, 2008 - 4:25 PM
Convention Center, Second Level, R03 (Ernest N. Morial Convention Center)
08063

Light Rail Transit Stray Current Control: How Much Water Line Protection is Really Needed?

Dale Lindemuth and David H. Kroon, Corrpro Companies Inc

Modern-day DC powered light rail lines are typically designed with many effective stray current control features built-in, principally an electrically ungrounded traction power negative return circuit.  This often includes track construction measures intended to establish much higher track to earth resistances when compared to the streetcars of long ago, thereby dramatically reducing stray current leakage to tolerable levels.  Case histories of water pipelines constructed near light rail lines built within the last few years are reviewed.  Results of field evaluations in Minneapolis, Salt Lake City, and Sacramento are presented.  Guidelines for stray current corrosion protection strategies for ductile iron water pipelines are provided.

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