51313-02755-Oxygen and Corrosion Probes—Performance and Limitations in Laboratory

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Product Number: 51313-02755-SG

ISBN: 02755 2013 CP

Author: Phillip Glass

Publication Date: 2013

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In a research program jointly funded by the Pipeline Research Council International (PRCI) and the United States Department of Transportation (USDOT) in situ dissolved oxygen probes and corrosion monitoring probes were evaluated for their ability to monitor pipeline integrity in fuel grade ethanol (FGE) pipelines. Because dissolved oxygen concentration is known to be the most significant variable contributing to susceptibility of ethanol pipeline steels to ethanol stress corrosion cracking (eSCC) knowledge and control of dissolved oxygen levels in FGE is valuable for predicting and controlling eSCC. The performance of two commercially available dissolved oxygen probes was evaluated based on criteria such as overall probe behavior probe accuracy length of useful life and feasibility of use in the field. Similarly electrical resistance (ER) and linear polarization resistance (LPR) probes were evaluated for their ability to provide electrochemical corrosion attack monitoring such as mass-loss corrosion pitting corrosion and eSCC as ultimately a way to monitor pipeline integrity. Finally U-bend specimens and an instrumented compact tension specimen were also evaluated to provide additional insight into eSCC monitoring abilities. All probes and specimens were submitted to a three month exposure in a synthetic fuel grade ethanol (SFGE) environment. A weekly aeration and deaeration routine as well as chemical additions were implemented to simulate various stages of ethanol handling during storage and transfer. In addition to SFGE the dissolved oxygen probes were briefly introduced to gasoline and jet fuel to simulate the scenario in which a pipeline was used for transportation of different fuels. This paper discusses the results of the investigation as well as recommendations for best practice of oxygen and corrosion monitoring in FGE pipelines.