OIL REFINERIES – It is an oil refinery with a capacity of over 1 million tons per year. Unlike low-tonnage mini-refineries, they are larger in size and have a greater depth of oil refining, they can produce a variety of products (gasoline, kerosene, fuel oil, diesel fuel, oils and lubricants, bitumen, coke, raw materials for petrochemicals). Refineries differ in oil refining methods, tonnage and refining depth.