In our daily use, large centrifugal pump is one of the more common products. It is widely used in various fields of industry. It uses the centrifugal force generated by the rotation of the impeller to work, but there are many types of equipment on the market and different standards. What should I pay attention to when purchasing a large centrifugal pump?

Select the type and model of the large centrifugal pump: first, the type of the pump should be determined according to the nature and operating conditions of the liquid to be transported, and then the appropriate model should be selected from the pump sample or product catalog according to the determined flow rate Qe and head He. The flow rate and pressure head provided by the outgoing pump may not exactly match the flow rate Qe and pressure head He required by the pipeline, and there is some margin in consideration of the changes in operating conditions, the flow rate and pressure head of the selected pump can be slightly larger. , but under this condition, the efficiency of the corresponding pump should be relatively high, that is, the coordinate position of the point (Qe, He) should be below the H-Q curve corresponding to the high efficiency range of the pump.
Determine the flow rate and pressure head of the conveying system: The conveying amount of the liquid is generally specified by the production task. If the flow rate fluctuates within the characteristic range, the large flow rate should be considered when selecting a large centrifugal pump. According to the arrangement of the pipeline of the conveying system, calculate the pressure head required for the pipeline under large flow.
Determine the type according to the nature and operating conditions of the liquid to be transported, determine the model of the large centrifugal pump according to the flow rate (generally determined by the production task) and the pressure head required in the calculation pipeline. If the viscosity and density of the liquid to be transported are different from those of water When it is large, the characteristic parameters of the pump should be calculated: flow, head and shaft power.
There may be several types of pumps that meet the requirement of operating within a good range at the same time. The operating point of each pump can be determined separately, the efficiency at the operating point can be compared, and the optimal one can be selected. In addition, the technical level of the large centrifugal pump manufacturer should also be considered. , quality issues, but also to combine their actual needs. Pay attention to these points and you can find a satisfactory device.