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How to get from pump flow rate to pressure change 
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#1
Nov812, 05:48 PM

P: 47

Hi,
Essentially what I need is a pump that will pump 40 gallons of water per hour to a height of 8 feet. Ignoring pressure losses in the lines (for now) I used the bernouli equation to determine that I need a pressure change of 3.44 psi in my pump. I found these pumps that look suitable but all list a max head far lower than the 8 feet I need. http://www.drsfostersmith.com/produc...m?pcatid=21414 I was thinking maybe just use one with a higher volume flow to compensate for the head loss. Maybe the 100 gph one? Is there a way to determine exactly what I need? Thanks! 


#2
Nov812, 06:43 PM

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Thanks
PF Gold
P: 6,334

If the pump cannot deliver a head greater than 8', increasing the flow will not compensate. Find a pump which can deliver at least 8' of head, or redesign the piping system to reduce the head loss.



#3
Nov812, 06:54 PM

P: 47

Fascinating. Fluid mechanics has always baffled me. Thanks!



#4
Nov812, 07:50 PM

P: 145

How to get from pump flow rate to pressure change
http://www.drsfostersmith.com/pic/ar...id=285&aid=282
here is their product comparison including head values. 


#5
Nov812, 10:30 PM

P: 47

Out of curiosity, is there a fundamental reason why a pump that can pump 200 gph to a height of 5 feet, can't also pump 100 gph to a height of 10 feet?



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