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Figure 11.4 Petroleum cuts from TBP curve of crude.

For example, the crude considered above has a density of 34.1° API, which corresponds to a specific gravity of 0.854. The naphtha has a density of 61.7° API, which corresponds to a specific gravity of 0.732.

The traditional unit used for flowrate in petroleum refining in the United States is barrels per day (b/d). One barrel is 42 U.S. gallons.

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