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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.
Answer Wiki. The Delayed Coker unit is basically a tertiary unit for producing value added products such as petroleum coke(PetCoke). The heavy oil along with steam thermally cracked in the fuel fire furnace about 480C. Essentially the cracking begins at the onset of furnace and ends in the Coker.