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 throughout oil refineries, which are typically huge, vast industrial complexes. Oil refineries are similar to chemical facilities in many aspects, including the employment of a lot of technology.