1, must meet the requirements of process parameters such as flow, lift, pressure, temperature, NPSH 2, must meet the requirements of the characteristics of the medium: (1) For the pump conveying flammable, explosive, toxic or precious medium, shaft Seal reliable or non-leaky pump, such as shielded pumps, magnetic drive pumps, diaphragm pumps. (2) Pumps delivering corrosive media require that the overcurrent component be corrosion-resistant. (3) For pumps containing solid particulate media, wear-resistant materials are required for overcurrent components, and if necessary, the shaft seal should be rinsed with a cleaning fluid. 3, must meet the site installation requirements: (1) installed in the presence of corrosive gases pump, require measures taken to prevent atmospheric corrosion. (2) For the pump installed in the outdoor environment below -20 ℃, it is required to consider the cold and brittleness of the pump and adopt the low temperature resistant material. (3) For the pump installed in the explosion area, explosion-proof motor should be used according to the explosion area level. (4) For plants that require major overhauls every year, the continuous cycle of pump operation should not be less than 8000 hours. In order to meet the requirements of 3-year major overhaul, API610 (Eighth Edition) stipulates that the continuous operation cycle of the pumps for petroleum, heavy chemical and gas industries shall be at least 3 years. (5) The design life of the pump is generally at least 10 years. API 610 (Eighth Edition) requires a design life of at least 20 years for centrifugal pumps for the petroleum, heavy chemical and gas industries. (6) The design, manufacture and inspection of the pump shall comply with the relevant standards and norms. The commonly used standards and specifications are shown in Table 1-1. (7) The pump factory should ensure that the pump performance in the power supply voltage, frequency range. China's supply voltage and frequency range of variation: Voltage 380V ± 10%, 6000V + 5%, - 7% Frequency 50Hz ± 0.5% (8) To determine the pump model and manufacturer, should consider the pump performance, energy consumption , Reliability, price and manufacturing specifications and other factors. Table 1-1 Pump Common Specifications and Specifications Pump Type Standard and Specification Centrifugal Pump API 610 Centrifugal Pump for Petroleum, Heavy Chemical and Gas Industries ANSI B73.1M Technical Specification for Horizontal Centrifugal Pump for Chemical Industry ANSI B73.2M Pipe for Chemical Industry Pump Specifications ISO 2858 End Suction Centrifugal Pumps (16bar) Marking, Performance, Dimensions ISO 5199 Technical Requirements for Centrifugal Pumps (Class Ⅱ) GB 3215 General Technical Requirements for Centrifugal Pumps for Refinery, Chemical and Petrochemical Processes GB 3216 Centrifugal Pumps, Francis Pumps , Axial flow pump and vortex pump GB 5656 centrifugal pump technical conditions (Ⅱ) metering pump API 675 metering pump GB 9236 metering pump technical conditions GB7783 metering pump test method reciprocating pump API 674 reciprocating pump GB 9234 motor reciprocating pump technical conditions GB 7784 motor reciprocating pump test method JB 1053 General steam reciprocating pump technical conditions GB 9235 steam reciprocating pump test method Rotor pump API 676 rotor pump GB 10885 single screw pump technical conditions GB 10887 three screw pump technical conditions GB 9064 screw pump test method
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