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Stray Current Corrosion Risks and Case Histories in Communication Tower and Electric Transmission Applications

Picture for Stray Current Corrosion Risks and Case Histories in Communication Tower and Electric Transmission Applications
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Stray current refers to electric current that flows elsewhere rather than along its intended path. Stray current is a well-known factor in pipeline maintenance and has been discovered to be an important consideration in communication and electric transmission structure maintenance.  Corrosion caused by stray current is frequently many magnitudes greater than corrosion that occurs naturally in soil.  Stray current may accelerate corrosion on guy anchors of communication towers and electric transmission towers which could lead to reduced service life or catastrophic failure. 

In this paper, stray current corrosion risk for galvanized guy anchors is discussed in detail. Identification by structure-to-soil potential measurements is discussed.  Stray current case studies are presented. Overall, this paper demonstrates that while stray current corrosion is a significant risk for guyed telecommunication and electric power structures, it can be detected and mitigated. This paper is an overview of the commonly accepted practices of stray current detection and mitigation used today. 

Product Number: 51320-14770-SG
Author: Anil Kumar Chikkam, Freddy Avendano and Peyman Taheri, Mehrooz Zamanzadeh, Nitesh Ahuja, Kevin Groll, Ben Jessup
Publication Date: 2020
$20.00
$20.00
$20.00
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Picture for Analysis of Long-Term Data Logging Measurements on Pipelines Influenced by LRT Stray Current
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51318-11215-Analysis of Long-Term Data Logging Measurements on Pipelines Influenced by LRT Stray Current

Product Number: 51318-11215-SG
Author: Erik Llewellyn / Zachary Sharon
Publication Date: 2018
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Information is presented on field data collection and management, data correlation, data analysis, and future considerations for stray current monitoring.
Picture for Research on Parameter Fluctuation Characteristics and Effects on Corrosion Rates under Dynamic DC Stray Current from Metro System
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Research on Parameter Fluctuation Characteristics and Effects on Corrosion Rates under Dynamic DC Stray Current from Metro System

Product Number: 51319-13203-SG
Author: Yanxia Du
Publication Date: 2019
$20.00

With the large-scale construction of metro systems in many cities of China a growing number of buried metal pipelines are suffering from dynamic DC stray current in recent years. However less work has been carried out on the effect of dynamic DC stray current on corrosion rate of steel structure therefore there is a lack of consistent corrosion evaluation criterion under dynamic DC stray current in the world currently. Based on measured dynamic fluctuating parameters on buried pipelines interfered by dynamic DC stray current from metro system the fluctuation characteristics such as fluctuating period waveform and amplitude were analyzed systemically. Corrosion coupons were buried near the pipelines interfered by dynamic DC stray current and connected electrically with the pipeline and after 6 or 12 months the corrosion coupons were dig out and corrosion rates of them were obtained by weight loss tests. The relationships between dynamic fluctuation parameters and corrosion rates were analyzed which could provide reference for the buildup of corrosion evaluation criterion under dynamic DC stray current.
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