How do you calculate water pressure (PSI) from pipe diameter and gallons per minute?

Answer 1

I'm think that you should run the water out of whatever faucet you are wondering about and time and see how much water comes out in 15 seconds. And times that by 4.
If you are trying to find how much pressure comes from a well, then you need to figure out the hp of the pump that is pumping that water out.
Ya know what? If you are on well water, just go to the pump and it should say on the side what the psi is.
And from looking at the diameter of the pipe that the well is using to put out should be what you should use, for that particular well.
There's gotta be somebody out there that knows more than I do.
Good luck ;0)

Answer 2

Calculate Gallons Per Minute

Answer 3

You cannot calculate pressure (psi) from pipe diameter and gpm. You can only calculate flow rate.

Pressure is resistance to flow. Maximum pressure cannot be calculated until the flow is stopped.

If you have a 20 gpm pump set at say 1000 psi then open a valve fully somewhere down stream, the pressure will fall until the friction inside the piping is great enough to create some pressure by resistance to flow. If the pipe is large enough the pressure will drop to almost "0" but as you begin closing the valve the pressure will begin to increase and continue until the valve is closed and the pump relief valve opens and closes to maintain the pressure at 1000psi until the valve is again opened.

Answer 4

This Site Might Help You.

RE:
How do you calculate water pressure (PSI) from pipe diameter and gallons per minute?

Answer 5

How To Calculate Psi

Answer 6

1.Call your water company. They will tell you the system pressure.

2. For gpm get a 1 gal bucket and a watch w/ 2nd hand. Open faucet wide open, put bucket under flow and start timing. However long it takes to fill bucket is where you begin your math.

3. If this sounds too hard see #1