The major areas covered by the oil and chemical industry installations are as follows: (1) The petrochemical processing industry that produces petroleum products and petrochemical products using oil and gas as raw materials has a product chain as shown in Figure 3-1. (2) coal chemical processing with coal as raw material. (3) The basic chemical industry and plastics, synthetic fibers, synthetic rubber, pharmaceuticals, Dyes and other industries. The oil and chemical industry pumps have the following characteristics: (1) many types of pumps. Including centrifugal pump (including shaft seal centrifugal pump, sealless centrifugal pump, high speed centrifugal pump, pitot tube centrifugal pump, etc.), axial flow pump, mixed flow pump, vortex pump, diaphragm pump, metering pump, screw pump, gear pump, , Vane pump, liquid ring pump, jet pump and so on. (2) As the heart of the device, pumps are widely used in the oil and chemical industry. 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%. (3) the working conditions of the pump is harsh. Such as: transport medium is relatively harsh, such as high temperature, high pressure, corrosive, still dangerous or toxic Media: where the environment is harsh, such as explosion and fire risk areas, corrosive areas, the presence of chemical, mechanical, heat, And sand and other environmental conditions of the area.
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