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08153 Prevention of Internal SCC in Ethanol Pipelines

Picture for 08153 Prevention of Internal SCC in Ethanol Pipelines
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Product Number: 51300-08153-SG
ISBN: 08153 2008 CP
Author: J. Beavers, M. Brongers, A. Agrawal, and F. Tallarida
Publication Date: 2008
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$20.00
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There is significant interest within the pipeline industry in transporting fuel-grade ethanol (FGE) as a result of the increased usage of ethanol as an oxygenating agent for gasoline and interest in ethanol as an alternative fuel. Currently, FGE is transported primarily by railroad tanker cars, tanker trucks, and barges. Stress corrosion cracking (SCC) has been observed in carbon steels in contact with FGE ethanol in user terminals, storage tanks, and loading/unloading racks. This paper summarizes the results of recent research, funded by the Pipeline Research Council International (PRCI), in which methods for prevention of internal SCC in ethanol pipelines were evaluated. These methods included the addition of inhibitors and oxygen scavengers to the ethanol and other methods of deaeration.
There is significant interest within the pipeline industry in transporting fuel-grade ethanol (FGE) as a result of the increased usage of ethanol as an oxygenating agent for gasoline and interest in ethanol as an alternative fuel. Currently, FGE is transported primarily by railroad tanker cars, tanker trucks, and barges. Stress corrosion cracking (SCC) has been observed in carbon steels in contact with FGE ethanol in user terminals, storage tanks, and loading/unloading racks. This paper summarizes the results of recent research, funded by the Pipeline Research Council International (PRCI), in which methods for prevention of internal SCC in ethanol pipelines were evaluated. These methods included the addition of inhibitors and oxygen scavengers to the ethanol and other methods of deaeration.
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Stress corrosion cracking (SCC) of carbon steel in fuel ethanol service has been observed in an increasing number of failures in the last few years. In the presence of oxygen, all of the samples evaluated in this study produced varying degrees of SCC, except for one of the producer ethanol samples. The reason for the high corrosion potential in this sample is still unknown and more detailed analysis of the sample chemical make-up is needed.

 
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