Sizing A Pump

Here is an easy-to-understand explanation for sizing an irrigation pump.

In order to size a pump, you need to know two things.
How many Gallons Per Minute (GPM) you need &
How many Pounds Per Square Inch (PSI) you need.

For GPM, decide what zone will be your largest zone & how many sprinklers will be turning on at a time.
For Example, if your largest zone is 6 rotary type of sprinklers with a 3 GPM nozzle in each head, then your GPM would be
6 heads (times) 3 GPM (equals) 18 GPM needed.

For PSI, you typically need to know
How much pressure do you need at the sprinkler (plus) how much pressure will you lose through friction loss.
For Example, a typical rotary sprinkler optimum working pressure is 40 PSI (plus) a typical friction loss might be 20 PSI...
Thus, 40 PSI (plus) 20 PSI (equals) 60 PSI needed.

Now, you can look in our catalog or call 1-800-347-4272 and ask for a pump to deliver 18GPM @ 60 PSI.