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Pressure/GPM/Diameter Calculationsby ISX
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#1
Sep1610, 05:42 PM

P: 116

I have been searching for a long time and can't figure this out. The formulas I find are way over my head.
Anyhow, I am trying to find how much flow would go through 2 different sized pipes. One is 3/8" ID and the other is 1/2" ID. The 3/8" uses 26psi and the 1/2" uses 17psi. All I want to know is the GPM each one will flow. I noticed there was a lot about constant of liquids so just use water. As for pressure drop stuff, there is a pump drawing in water and the pipes are on the other side and they have no end on them, so they are just shooting the water out like a hose with no end on it. Thanks for any help I can get on this. Sorry if it is a dumb question. 


#2
Sep1610, 06:00 PM

P: 4,663

Go to http://www.pipeflowcalculations.com/
Click on one of the online calculators on the lefthand side. There are also other online calculators on the web. Bob S 


#3
Sep1610, 06:43 PM

P: 116




#4
Sep1610, 09:27 PM

P: 4,663

Pressure/GPM/Diameter Calculations
1/2" pipe, 2.9 gpm, pressure drop=17 psi per 100' of pipe 3/8" pipe, 1.3 gpm, pressure drop=24 psi per 100' of pipe. If you wold rather not use an online calculator, you can use the Hazen Williams formula at http://www.engineeringtoolbox.com/ha...terd_797.html Bob S 


#5
Sep1610, 09:39 PM

P: 116

Ah that works. Think I halfway understand the principles now too. Thanks for the help!



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