According to statistics, there is a medium-sized refineries pump more than 1000 Units, which account for 83% of centrifugal pump, reciprocating pump 6%, 3% gear pump, screw pump and pump the rest and so on. A petrochemical plant has more than 2000 pumps, which pump 45%, 23% gear pumps, reciprocating pumps and screw each 12%, 6% shield pump. These pumps generally driven by the motor. Petrochemical pump suction pressure transmission medium to 300MPa, temperatures from 140 ℃ below zero to nearly 500 ℃, some viscous media, and some also with solid particles, the majority of transmission has corrosive media. Petrochemical pump is the most energy-consuming equipment, electric power plant of about 50%. Petrochemical pump through our country's development over the years, relatively complete species, especially since the introduction of reform and opening up a lot of advanced foreign technology, technical performance and product quality has been greatly improved. But the whole, domestic pumps, compared with foreign products, there are still many gaps: First pump standardization, serialization and the degree of generic bad. Because of the self into a series of manufacturers, standardization and interchangeability of parts and components low, the lack of uniform standards, product specification models also can not meet the needs of the development of the petrochemical industry. Second, poor quality and reliability. This is mainly because of domestic varieties less corrosion-resistant material or inappropriate material, as well as the machining accuracy is not high; other low pump seal life, less variety. Mechanical seal life abroad is generally about two years, the domestic petrochemical pumps have not yet reached this level. Three pumps are inefficient. Because of poor internal pump design model, machining accuracy is not high, pump efficiency generally lower than abroad 2% ~ 3%, so a lot of chemical flow pumps have had to import from abroad.

   In recent years, many pump advanced technology introduced from abroad, so that the skill level of petrochemical pumps has greatly improved. Dalian such as pumps and compressors Sulzer Sulzer introduced the company's technology, can produce 43 series specifications for more than 1000 species of petrochemical pump.

 As the petrochemical industry for future technologies and scale of the continuous development of the petrochemical pump more and more high requirements, in addition to continue to improve the quality of conventional pumps, the expansion of species outside the specifications, especially for the transportation of corrosive materials, pump more and more requirements large, such as ethylene production in the ethylene cracker, polyethylene and polypropylene plant installations, chemical fiber production plant in the PTA (purified terephthalic acid), polyester spinning plant and equipment, such as polyester, so efforts to develop corrosion-resistant technology. At present, the material is still Corrosion-resistant pump substantial use of ferrous metal materials, high nickel alloy materials, the future, asking for more and using titanium, zirconium, tantalum, such as excellent corrosion-resistant materials, also the development of non-metallic materials such as ceramics, glass materials such as steel and graphite .