Pump cavitation
I have a 127 degree Celsius glycol system. This is a loop system where the glycol recirculates and then feeds into a tank where it is then pump back around. The pump is cavitating . The best efficiency point for the pump is 600 GPM which is 180 psig discharge pressure. But they are running at 300 gpm at 50 psig discharge pressure. The pump curve says it should be 190 psig. But the PCV holds it at 50. How are we so far off the curve and why are we cavitating