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11339 Lessons Learned During the Startup of the Phoenix Valley Light Rail System

Picture for 11339 Lessons Learned During the Startup of the Phoenix Valley Light Rail System
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Product Number: 51300-11339-SG
ISBN: 2011 11339 CP
Author: Philip Simon and Preston Ford
Publication Date: 11339
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Severe pipe-to-soil potential swings, indicating DC stray current interference, were observed on the natural gas distribution system in Phoenix, Arizona during the startup and initial operation of the Valley Metro Rail (VMR) system. Cooperative testing involving VMR and the area s gas distribution system owner resulted in a timely identification and resolution of the stray current sources. The VMR was operating within the design stray current limits shortly after revenue operation. This paper describes the cooperative testing, the unique problems identified and the effects of the repairs completed.

Keywords: DC stray current interference, buried pipeline, Light rail transit system, traction power station, interruptible coupon, ungrounded mode
Severe pipe-to-soil potential swings, indicating DC stray current interference, were observed on the natural gas distribution system in Phoenix, Arizona during the startup and initial operation of the Valley Metro Rail (VMR) system. Cooperative testing involving VMR and the area s gas distribution system owner resulted in a timely identification and resolution of the stray current sources. The VMR was operating within the design stray current limits shortly after revenue operation. This paper describes the cooperative testing, the unique problems identified and the effects of the repairs completed.

Keywords: DC stray current interference, buried pipeline, Light rail transit system, traction power station, interruptible coupon, ungrounded mode
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