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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.
To help you appreciate the magnitudes of these units, hereare the volumes of some familiar objects:Chicken egg 60 mLOne breath of air 500 cm 3 Coke can 355 mLScientists often measure volumes with pipets and graduatedcylinders. Pipets are used to measure small volumes, typi-cally 25 mL or less.