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Old 01-15-2013, 09:40 PM
Ramairfreak98ss Ramairfreak98ss is offline
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Join Date: Aug 2005
Location: Burlington County, NJ
Posts: 2,212
1.5" well pump to 1" feed for irrigation

A commercial site has a 2yr old well system with 1.5 pipe coming into the building. I turned on a faucet, that was flowing about 4gpm, and it took just over 3 minutes to get the well pump to turn on.

Pressure starting was 38psi.
minus ~12 gallons of water displacement in two 40-50 gallon ballast tanks and pump kicked on at 32psi.

Pump turns off at 58psi within about 60-70 seconds.

I know we'd have to set the water pressure turn on point higher than 32, at least 40psi, 58psi is plenty for even the farthest runs in 1" PVC.

The system would need 16-18 zones from one 1" line branched off the 1.5" main line from the building. Run times may be a bit long with so many zones, but all the 1" pipe is already stubbed out under the curbs, sidewalks and brand new paved parking lots, so we have a maximum of one 1" line from the building to the first box.

We can use water from 5pm - 8am free will. They're not cheap, and willing to pay for a top notch system to some extent. If the 1" line is flowing ~20gpm to each zone, will it cause the pump to cycle on and off the entire time?

Should each zone be designed to start at 40-58psi, but assume you'll only have 40psi, and pull enough water for each 1" line zone to keep the pump maxed and not able to reach 58psi to shut back off?

No major areas here, all will be spray zones and probably rain bird 5000 series rotors. 1" line wouldn't power the larger ones with the distance even if we had the space to utilize them.

Looking to use a Rainbird esp-smt controller with ET manager and wireless controller... more for our use than theirs.

They currently have a 2yr old Hunter controller "the $85 homeowner one" on 4 zones for spray heads by the building... just to keep things from dying when the building was built.
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