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Project: T154700 #5170

The primary objective of this study is to prepare appropriate criteria and recommendations to consider for the safe coordination between pipelines and electrical distribution utilities sharing the same corridors. Industry trends have resulted in an increasing number of shared right-of-ways (ROWs) between gas and electric utilities. The increased focus on shared ROWs is the result of several factors including permitting, topography, land access, and urban sprawl. AC interference on pipelines from overhead power lines has been studied extensively and it is well documented that pipelines and metallic objects collocated with overhead electric power lines are subject to AC interference in the form of capacitive, electromagnetic induction, and resistive interference. The focus of these studies and of AC interference on pipelines in general, has primarily been on electric transmission lines, which are rated for much higher current loads than electric distribution lines. While electric transmission lines tend to operate at higher current levels than distribution lines, distribution lines typically operate at higher levels of phase unbalance and system harmonics, both of which can result in elevated levels of AC induction on nearby pipeline segments. The focus of this study is to prepare a set of recommendations to minimize the AC interference on pipelines as a result of overhead electric distribution lines.


AC interference, Electric distribution lines, Triplen harmonics, AC induction, Faults