Thanks to everyone who responded. I will check the pump BHP to flow curve prior to proceeding with a recommendation. I don't think we can change impeller or motor size since the recirc flow is typically ~20% of process flow, however, but the recirc valve varies from 0 - 100 % open. We need...
I have looked at a VFD application. The system pressure is such that the minimum pump speed must be 70 to 80% just to overcome the minimum head requirements. That is why I am looking at a control valve application.
In a paper mill I am working in, they are using recirc lines to control pressure and thus flow to a process. They use process line pressure to open and close a recirc valve, diverting flow back to a holding tank which provides for a pump's suction. The end result is that the pump is always at...
