First, the selection of centrifugal pumps list the basic data:
1, the characteristics of medium: medium name, specific gravity, viscosity, corrosiveness, toxicity and so on.
2. The particle diameter and content of the solid in the medium.
3, medium temperature: (centigrade)
4, the flow needed by centrifugal pumps, the general industrial pumps can ignore the leakage in piping system, but we must consider the effect of process change on flow. If the agricultural pump is used to transport water in a open channel, it is necessary to consider the leakage and the amount of evaporation.
5, pressure: the pressure of the suction pool, the pressure of the drainage pool, the pressure drop in the pipe system (head loss).
6. The data of the pipe system (pipe diameter, length, type and number of pipe accessories, and the high geometry of the sump to the pressure pool).
7. The material and seal form of the centrifugal pump
8. Select the suitable range and structure of the pump according to the flow and lift
9, choose the form of clear water pump according to the installation place (vertical, horizontal, transmission form)
10. Supply the power source and choose the driving force
11, choose the structure of the pump according to the use (clean water pump, mud pump, sewage pump, etc.)
Two. Determine the flow rate of the flow head of the centrifugal pump.
1. if the centrifugal pump has given the minimum, normal and maximum flow rate in the production process, it should be considered according to the maximum flow rate.
2. if the normal flow rate is only given in the production process, some allowance should be taken into consideration. For the ns>100 large flow and low lift pump, the flow allowance is 5%. For the small flow and high lift pump of ns<50, the flow allowance is 10%, 50&le, ns&le, 100, and the residual volume of the pump is 5%. For the poor quality and bad running pump, the flow allowance should be 10%.
3. if the basic data is only given to the weight flow, it should be converted into volume flow.
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