Centrifugal pump head and outlet pressure
Thread Content
I have a question: A circulation pump has a head of 40 meters, and the height difference from the pump outlet to the point where the water is used is 30 meters. The circulation water enters a water cooler at a pressure of -0.08 MPa, while the gauge pressure at the pump outlet is 0.22 MPa. Is this normal? Is it because of vacuum and the suction lift that the pump outlet pressure is only 0.22 MPa? If selecting a new model, is a head of 30 meters sufficient?
You may have overlooked a few important indicators. The process parameters of a pump include head (pressure), flow rate, and suction pressure (the pump’s net positive suction head). The most important one is the rated current. When adjusting the centrifugal pump, be sure to fully open the inlet valve and fully close the outlet valve; then gradually increase the opening degree, expanding it until the current reaches the rated value, as long as the rated current is not exceeded. It might be caused by an excessive opening of the pump’s outlet valve; it’s an operational issue. For reference.