In this study, anhydrous ethanol fuel samples obtained from pipelines dedicated to the ethanol fuel transport and from multi-product pipelines were tested by standard slow strain stress tests and API 5L X65 notched specimens. The fractures of the specimens were observed by optical and scanning electron microscopes. The metallographic examination of a normal section of the fracture surface was carried out. It was observed that the ethanol samples from multi-product pipelines were more aggressive than the ethanol fuel from dedicated pipeline samples. On the other hand, ethanol fuel from dedicated pipeline samples presented quasi-cleavage fractures which have not been seen before in the literature. Nowadays, it has been known that Brazilian Midwest is producing fuel ethanol from second crop corn. This study sheds light on a possible change in the Brazilian fuel ethanol matrix that in the past was predominantly composed of sugar cane ethanol and is currently receiving the contribution of corn ethanol in order to avoid any transport and storage system failure.

在这项研究中，通过标准慢应变应力测试和API 5L X65缺口样品测试了从专用于乙醇燃料运输的管道和多产品管道获得的无水乙醇燃料样品。用光学和扫描电子显微镜观察样品的断裂。对断裂面的正常截面进行金相检查。观察到，多产品管道中的乙醇样品比专用管道中的乙醇燃料更具腐蚀性。另一方面，专用管道样品中的乙醇燃料呈现准裂解裂缝，这在文献中是从未见过的。如今，众所周知，巴西中西部地区正在从第二季玉米中生产燃料乙醇。