Each flow point of a submersible pump corresponds to a corresponding cavitation margin, the flow rate is different, and the difference of the cavitation margin is different. Under normal circumstances, the greater the flow, the lower the height of the installation. If the submersible pump running below the rated flow, there will be no problem. If the submersible pump is likely to run in the large flow area, you should consider the large flow of the submersible pump cavitation margin, can not only calculate the amount of fixed-point, and to the work point of the large flow to install a high degree of re calculation.
Inlet pipe can not be less than the diameter of the submersible pump suction. Under normal circumstances, in the calculation of the height of the installation, suction diameter of the pump is to select the standard suction pipe diameter. If the actual installation of suction pipe diameter becomes smaller, then increase the submersible pump suction resistance, equivalent to an increase of the installation height of the submersible pump, increase the possibility of cavitation occurs.
At the end of the suction pipe when the installation of submersible pumps, try to reduce the number of elbow, reducer, valve. Elbows, reducers, valve resistance coefficient is far greater than the straight section, increase elbow, reducer, a valve is equivalent to greatly increase the straight section.
Must ensure that the inlet pipeline sealing performance should be in good condition, no leakage point. Because once there is a leak, the inlet pipeline can not form a high degree of vacuum, the liquid can not enter the submersible pump cavity.
