Basics of refinery processes of petroleum units - Paperbackby Sajjad Porgar (Author) The transformation and refinement of crude oil (petrol) into useful products including gasoline (petrol), diesel fuel, asphalt base, fuel oils, heating oil, kerosene, liquefied petroleum gas, and petroleum naphtha takes place at an oil refinery, also known as a petroleum refinery. Streams of fluid are often transported between big chemical processing units, such as distillation columns, by extensive piping that runs