In this paper we are presenting refining and petrochemical. Petroleum is the most valuable feedstock for both fuels and chemicals. It is clear that, the value of the products from a barrel of oil is far more than the selling price of a barrel, even considering the cost of manufacturing. The oil refining industry changes over unrefined petroleum into in excess of 2500 refined items, including condensed oil gas, gas, lamp fuel, avionics fuel, diesel fuel, fuel oil, greasing up oils, and feedstocks for the petrochemical business. Oil processing plant exercises begin with receipt of rough for capacity at the treatment facility, incorporate all oil taking care of and refining activities, and they complete with capacity preliminary to transportation the refined items from the treatment facility.