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Overview of Crude Units. Crude units are the first units that process petroleum in any refinery. There objective is to. separate the mixture into several fractions like naphtha, kerosene, diesel and gas oil. A. schematic diagram of an atmospheric crude fractionation unit is shown in Figure 1-1. Crude. water.
The refineryâs crude unit, which could support an additional 20,000 b/d of crude to fill existing downstream units, already exceeded its processing capacity by 4,000 b/d during August without any active debottlenecking project work in progress at the time.