Evacuation refers to the presence of gas and liquid in the pump, the pump cannot operate, and the flow and pressure tend to zero. Cavitation refers to the change and decrease in flow rate and pressure of the medium originating from the pump during operation, resulting in hydraulic impact.
How can the double suction centrifugal pump prevent cavitation?
Usually, the evacuation of a double suction centrifugal pump refers to an air pocket phenomenon that occurs inside the pump, such as leakage in the installed pipeline, incomplete discharge of air pockets in the pipeline, or changes in operation and process. So in operation, we should start with stable process operating conditions, where the operating temperature is easy to set the lower limit and the pressure is easy to set the upper limit. To avoid or control changes in cavitation phenomena, the pump flow during operation should be within the range specified on the pump nameplate as much as possible to minimize significant changes in pressure and temperature. In the suction pipeline of the pump, gas retention should be prevented, and for standby pumps with negative inlet pressure, remember to close the inlet.
