Used 65,000 - 170,000 BPD Atmospheric Crude Oil Distillation Unit (CDU) with Vacuum Distillation (VDU) built in 1976. This CDU & VDU is capable of 65,000 - 170,000 barrels per day. The unit preheats, de-salts, and separates crude oil into naphtha, No. 2 fuel oil, heavy atmospheric gas oil (HAGO), and atmospheric tower bottoms with the crude tower and preflash drum. The HAGO and No. 2 fuel oil are stripped of light hydrocarbons and dried respectively. Naphtha is further refined by the debutanizer tower, which separates the unstabilized straight run naphtha into a bottoms product of naphtha and an overhead stream of liquefied petroleum gas. The sour water stripper removes hydrogen sulphide, ammonia, and other impurities from sour water, then returns it to the desalter.