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- W2807033083 abstract "A carbon steel pipe of ASTM A106 grade B [UNS K03006] specification was in service of vacuum residue in a crude oil vacuum unit at temperatures ranging from 293 to 350 °C. After 20 years of service it failed due to a combination of sulfidic and naphthenic acid corrosion. This failure motivated this is work, where the mechanism of corrosion failure mechanism is studied, based on the microstructural characterization of the corroded surfaces of coupons tested in a laboratory simulated vacuum residue environment, with variations in temperature and exposure times. Experimental results showed that at 310 °C, the preferential formation of a homogeneous passive iron sulfide film occurred, which promoted general sulfide corrosion. However, the greatest corrosion rates occurred at 350 °C, due to the generation of sour primary distillates and the fragmentation of the vacuum residue molecule, which triggered a naphthenic acid corrosion mechanism, which caused localized attack corrosion. It is concluded that the most important factor to be monitored in vacuum residue service in crude oil vacuum residue distillation units, in order to predict and prevent corrosion, is the temperature. Specifically, operation temperatures above 310 °C should be avoided, because high corrosion rates and the combination with localized attack in the forms of pitting and grain boundary dissolution. In order to prevent failures in vacuum residue pipes, closed interval thickness surveys and close temperature monitoring are recommended." @default.
- W2807033083 created "2018-06-13" @default.
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- W2807033083 date "2018-10-01" @default.
- W2807033083 modified "2023-10-17" @default.
- W2807033083 title "High-temperature corrosion of a UNS K03006 steel pipe in a crude oil vacuum residue distillation unit" @default.
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- W2807033083 doi "https://doi.org/10.1016/j.engfailanal.2018.05.016" @default.
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