Information on compounds found in oil refining is presented, calculation formulas and nomograms, characteristics of oils and gas condensates, quality indicators of petroleum products, methods of testing oils and petroleum products are given. The book describes the processes of oil refining and the UIO of oil refineries, special sections are devoted to issues of safety and environmental protection, the choice of equipment for oil refineries. The handbook is intended for operators, craftsmen, workers, technicians of oil refineries and petrochemical plants.