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Water flow equation

Water flow equation

Water flow equation

(OP)
I had it written down, lost it and for the life of me I can't remember how it goes.

Equation to figure out flow at a certain pressure when given static and residual. For example, I do a flow test and come up with x static and y residual pressure at some flow. I need to determine how much flow will be available at 20 psi.

I know that I can just use 1.85 graph paper, but for the sake of precision, does anyone have this equation handy?

Thanks in advance!

Steve

RE: Water flow equation

maybe:

sorry cannot copy but:

Qr = Qf x hr(.54) power divided by hf (.54) power


where:
QR = flow predicted at desired residual pressure
QF = total flow measured during test
hr = pressure drop to desired residual pressure
hf = pressure drop measured during test

check this link for the formula:::


http://developmentservices.cityofoxnard.org/Upload...

RE: Water flow equation

(OP)
Much appreciated!

RE: Water flow equation

Qf=Qr((Hr^0.54/Hf^0.54)

Qf=flow at desired pressure (gpm)
Qr=flow at residual pressure (gpm)
Hr=(static - desired pressure) (psi)
Hf=(static - residual pressure) (psi)

RE: Water flow equation

forgot about the "delta" symbol!!!!

RE: Water flow equation

Hey SK, shoot me an email and I will send you a flow test form in MS Excel that does the graphs and also gives you the flows at 20 psi. I got it from OSU's website long ago, so I don't believe it is an proprietary information or spreadsheet.

Travis Mack
MFP Design, LLC
www.mfpdesign.com

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