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The first post

Wednesday, May 29th 2013, 7:56am

by jmed999

How to choose nozzles

I bought a house with a sprinkler system that is producing dry spots. I'm wanting to replace the nozzles with the correct GPM rates. They used 2 GPM nozzles on all rotors. I'm trying to use the following chart...

Quick & Dirty Guide for Rotor Nozzle Selection

1. Find the section of the chart with your desired spacing.
2. Find the pattern (1/2, full circle,etc.) of the sprinkler.
3. The chart tells you the GPM the nozzle must have.
4. Use a nozzle size that comes close to matching both the PSI – GPM combination.
5. Ignore the radius given by the manufacturer.
6. Be sure to read the notes below the chart!



For 20-29′ spacing between sprinklers-
1/4 circle . . . 30 PSI – 0.8 GPM
1/2 circle . . . 30 PSI – 1.6 GPM
3/4 circle . . . 30 PSI – 2.4 GPM
full circle . . 30 PSI at 3.2 GPM
Important: see notes below!


For 30-39′ spacing between sprinklers-
1/4 circle . . . 40 PSI – 1.5 GPM
1/2 circle . . . 40 PSI – 3.0 GPM
3/4 circle . . . 40 PSI – 4.5 GPM
full circle . . 40 PSI – 6.0 GPM


For 40-55′ spacing between sprinklers-
1/4 circle . . .55 PSI – 3.0 GPM
1/2 circle . . . 55 PSI – 5.5 GPM
3/4 circle . . . 55 PSI – 8.0 GPM
full circle . . 55 PSI – 11.0 GPM

I found this info on another site. The issue is I have a range of 20-35 ft between rotors and my static pressure is 55 PSI. According to that chart what nozzles should I use for 1/4, 1/2, 3/4, and full circle?


Thanks for the help!