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How to get from pump flow rate to pressure change

by zzinfinity
Tags: head, pressure, pump
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zzinfinity
#1
Nov8-12, 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!
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SteamKing
#2
Nov8-12, 06:43 PM
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Thanks
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P: 6,752
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 re-design the piping system to reduce the head loss.
zzinfinity
#3
Nov8-12, 06:54 PM
P: 47
Fascinating. Fluid mechanics has always baffled me. Thanks!

huntoon
#4
Nov8-12, 07:50 PM
P: 147
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.
zzinfinity
#5
Nov8-12, 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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