# Pressure/GPM/Diameter Calculations

by ISX
Tags: calculations
 P: 115 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.
 P: 4,667 Go to http://www.pipeflowcalculations.com/ Click on one of the online calculators on the left-hand side. There are also other on-line calculators on the web. Bob S
P: 115
 Quote by Bob S Go to http://www.pipeflowcalculations.com/ Click on one of the online calculators on the left-hand side. There are also other on-line calculators on the web. Bob S
I have gone through that one and many others and I just can't figure them out.

P: 4,667

## Pressure/GPM/Diameter Calculations

 Quote by ISX I have gone through that one and many others and I just can't figure them out.
I used the calculator I recommended, and got the following numbers for the pressure drop per 100 ft of pipe:

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...ter-d_797.html

Bob S
 P: 115 Ah that works. Think I halfway understand the principles now too. Thanks for the help!

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