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 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 the effects of ethanol-gasoline blend ratio and steel metallurgy on SCC behavior were evaluated. Results of slow strain rate (SSR) tests of different grades of steel in different metallurgical conditions (weld metal, heat affected zone (HAZ) and base metal) are presented. The SSR test is an aggressive test technique and provides conservative bounds of the environmental conditions under which SCC can occur. If SCC is not found in a SSR test, it is unlikely to occur in an actual application; on the other hand, the presence of SCC in a SSR test may not necessarily affirm its occurrence in the field.
Effects of steel microstructure and ethanol-gasoline blend ratio on SCC of ethanol pipelines
2009
16 Seiten, 10 Quellen
Conference paper
English
Benzin , Dehnungsgeschwindigkeit , Erdölindustrie , Ethanol , Kohlenstoffstahl , Lagerbehälter , Mikrostruktur , nichtrostender Stahl , Pipeline , Rohrleitungskorrosion , Rohrstahl , Sauerstoffzufuhr , Schweißgut , Schweißverbindung , Spannungsrisskorrosion , Transport von Flüssigkeiten , Wärmeeinflusszone
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