Special Report: Crudes processed in US refineries continue to decline in quality

The gravities of crude oils processed in US refineries have slowed from a previously rapid decrease in quality to a decrease of 0.07° API/year over the last 10 years. During the same period, there was a moderate increase in sulfur content of the lower-quality crudes, about 0.032 wt %/year.The US Energy Information Administration (EIA) began reporting monthly and yearly composite values of ºAPI and sulfur content of crude oils processed within five Petroleum Administration for Defense Districts (PADDs) 18 years ago. Table 1 shows the latest 10-year (1992-2001) historical composite values of API gravity and sulfur content of crude oils processed by refineries in the five PADDs. Fo...

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