Flow rate math help

[EVMIII]

All other factors being equal using a 2000 gph pump, what's the difference in volume ( gph) using a 1.5" pipe, vs a 1" pipe, .75" pipe. Thanks.

 

[Catfishnut]

EVMIII

You would need to know the pump specifications (data chart of pressure / flow rate vs feet of head pressure or head loss) from the manufacturer to obtain the most correct answers here. They typically provide a chart that you can extrapolate a lot of useful information from based upon their recommended use for the pump. This would be necessary if you wanted to be accurate as the pressure is going to change because the pump is going to have a different and new head pressure to deal with so it changes other entries to the formulas as you change the pipe diameter

However, you can wing it and get a rough idea of what the differences are going to be between various pipe sizes. You can experiment with the formula below for one:

Q = (π * r4 * P) / 8Ln

Q = flow rate
π = 3.1416
r4 = radius of the pipe to the forth power
P = pressure
L = length of the pipe
n = viscosity of water (just treat this as 1.0 cP or 1.0 centiPoise @ 20° - 25°C)

OR you can experiment with this on-line calculator:

http://www.1728.org/flowrate.htm

Catfishnut

 

[DrCase]

You will definitely get more flow out of your pump with 1 1/2" pipe

 

[ronahalpern]

You will definitely get more flow out of your pump with 1 1/2" pipe

How do you measure the pipes that are there?

 

[DrCase]

? Well if you can , get the measurement of the inside of the pipe that will give you the ( ID ) size of the pipe
The (OD) outside diameter is a little bigger depending on the wall thickness

 

[Theman772]

Hook up a hose to the end of your pipe run the pump for 1 minute x 60= gph
That's a small pump not sure pipe size will make a big difference