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Old 03-28-2014, 12:08 PM  
kok328
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Wuzzat, engineering tool box is where I was looking for info.
Nealtw, got the pics downloaded thanks.
I plan on putting a VFD controller on it, maybe I can compensate with some bumped up pressure settings?



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Old 03-28-2014, 12:15 PM  
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Originally Posted by kok328 View Post
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).
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Old 03-28-2014, 04:27 PM  
Chris
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Chris, anyway to make your charts bigger, I can't see them completely but, it looks like what I'm looking for.
I can later from my computer, remember that the PSI the chart is referring to is Pitot pressure. For example, a couple weeks ago I was flushing a 4" line and my pitot tube was reading 40 PSI, now my lines static pressure was 150 psi. So this chart is pretty much useless with out a Pitot gauge. You would need to borrow or rent one to do this test. Although if you didn't need to know what yours has but just see what the loss would be, it will help.
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