What's the formula?

Question

What is the formula to determine the rate of flow (gallons per minute) of water through 1/2 inch pipe at a given pressure?

Answer 1

You're looking for Poiseuille's Law, follow the link below.


Volume Flow Rate =

(Pressure Diff * Radius^4) / (8/pi * viscosity * Length)


You will also need to know the viscosity of water at a given temperature. Go here to find it

http://en.wikipedia.org/wiki/Viscosity