An oil refining machine or petroleum refinery(but we have the edible oil refining machine) is
an industrial process plant where crude oil is processed and refined into more useful products
such as petroleum naphtha, gasoline, diesel fuel, asphalt base, heating oil,kerosene and liquefied
petroleum gas. Oil refineries are typically large, sprawling industrial complexes with extensive
piping running throughout, carrying streams of fluids between large chemical processing units.
 In many ways, oil refining use much of the technology of, and can be thought of, as types of
chemical plants. The crude oil feedstock has typically been processed by an oil production plant.
There is usually an oil depot (tank farm) at or near an oil refinery for the storage of incoming crude
oil feedstock as well as bulk liquid products. An oil refinery is considered an essential part of the
downstream side of the petroleum industry.