How to determine the installation of submersible pump height

How to determine the installation of submersible pump height
First, the importance of pump installation height
  The normal work of the pump is based on the water pump to meet its water absorption conditions for the premise. In many cases, the pump device failure, can not work properly, often due to improper selection of water conditions caused. The correct water absorption conditions, refers to the pumping process, the pump does not produce cavitation case of the maximum water absorption height. Therefore, the analysis and study of pump cavitation and harm, to understand the water pump performance and influencing factors, to determine the pump installation height for the proper use of water pumps is very important.
Second, the pump how to determine the installation height
   Water pump at work, because the pump impeller is rotating at high speed, the pump impeller population in the formation of a negative pressure in the inlet water surface pressure and water pump impeller suction mouth of the absolute pressure difference under the effect of water from the inlet water pipe Flow into the impeller of the import. As a barometric pressure equal to 10.33mH2O high, so the maximum suction pump height does not exceed 10.33m. In fact, the pump running in the pipeline and the elbow will have head loss, which shows the installation height of the pump is far less than 10.33m. Under normal circumstances is to use the local atmospheric pressure - centrifugal pump NPSH -0.5m = pump installation height.