As the heart of the device, pumps are heavily used in the oil and chemical industries. Data show that in the petrochemical plant, pump equipped with electromechanical power accounted for 26% to 59% of the whole plant electricity. According to expert estimates, the average power consumption of pump products in the country accounts for about 20% of the national total. In other words, in the petrochemical industry, pump share of the electricity ratio of 1.3 to 3 times the average. For example, a large 10 million tons / year refinery and its ancillary facilities (atmospheric vacuum distillation, catalytic cracking, coking, hydrogenation, etc.) require about 200 various types of pumps, of which 83% of centrifugal pumps, reciprocating pumps accounted for 6 %, Gear pumps and screw pumps accounted for 3%, others account for 8%. A million tons / year of ethylene and its associated equipment (including ethylene, butadiene, gasoline hydrogenation, polyethylene, polypropylene, acrylonitrile, styrene and polystyrene, irrigation areas, utilities, etc.) About 1000, of which centrifugal pumps (including sealless centrifugal pump) accounted for 82%, reciprocating pumps and metering pumps accounted for 8%, 5% gear pumps and screw pumps, the other 5%.