Originally Posted by kok328
I plan on putting a VFD controller on it, maybe I can compensate with some bumped up pressure settings?
Yes, by making the pump speed variable you can adjust out a lot of problems. But, how'd you size the pump in the first place? Post a link to this bugger.
For your 10 hp pump, assuming 50% effficiency, (head in feet) x gpm = 20,000 so at 120 gpm you can have 170' of head. Does that sound right?
City water may give you 16 GPM @0 PSI with 50 PSI @0 GPM. These are the extremes of the pump curve you see at a house while looking back into the city water supply (=huge pumps and miles of pipe).