Submersible pump selection step

List basic data:
1, the characteristics of the media: media name, specific gravity, viscosity, corrosion, toxicity, etc.
2, the medium containing solid particles of diameter, content (mass or volume percentage)
3, medium temperature: (c)
4, the flow of the general industrial use of pumps in the process can be ignored in the pipeline system leakage, but must take into account the impact of process changes on the flow. Agricultural pumps if using the water channel must also consider leakage and evaporation.
5. Pressure: pressure drop (head loss) of suction tank pressure drainage pipe system
6, the pipeline system data (diameter, length, pipe accessories and the number of the number of suction tank to the pressure tank geometry, high)
If necessary, the device characteristic curve should be made in the design and layout of the pipeline should pay attention to the following matters:
A, a reasonable choice of pipe diameter, pipe diameter at the same flow rate, liquid flow rate loss resistance is small but the high price of small small diameter pipeline will lead to resistance loss increases rapidly so that the selected pump head increased with increasing power and operating costs have increased technology and therefore should be considered an economic perspective
B, discharge pipe and pipe fittings shall be considered to be able to withstand the maximum pressure
C, the piping layout should be arranged into a straight pipe to minimize attachment and reduce the discharge side bending radius when the length of the pipeline must turn the elbow should be 3 ~ 5 times the diameter of the pipe angle as far as possible higher than 90 DEG D, the pump must be installed in the valve (valve or valve etc.) and inverse check valve is used to adjust the operating point of pump check valve in the liquid pump to prevent backflow when the reverse and pumps to avoid water hammer blow (when the liquid back will have enormous negative pressure pump damage)
Two, determine the flow head to determine the flow
A, if the production process has been given the minimum, normal, maximum flow should be considered according to the maximum flow
B, if the basic data only to the weight of the flow should be converted into volume flow
C, given only if the normal production process flow should consider certain allowance for ns>100 large flow and low lift pump does not flow the margin from 5% to ns>50 of the small flow high lift pump flow margin 10%50 = ns = 100, the pump flow margin also take 5% and the poor quality of operation of a pump the bad margin should be 10%