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  Jun 17, 2021
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Hi, I'm seeking advice from the community on how to assign the right point of connection characteristics for an irrigation system operating on a well pump. When reviewing the well pumping performance graph (see attached) the performance curve tracks pressure and flow performance across the pump's operating range.

If I am designing an irrigation system to operate on one of these pumps, what pressure and flow should I use for the point of connection?

As I understand it, the graph lists the dynamic pressure at any given flow, but Land FX wants static pressure. Does this make a difference for the program?

Thanks for your help!
more than a month ago
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#4196
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Here's my advice:

1. Get the well report, or have one done. This will describe flow, draw-down, etc. This will inform how much volume the pump can produce without sucking air, and thus your pump size.
2. Do some math. I'm sure you know that feet of head * .433 = PSI. So, based on pump curve, a 1.5 hp pump produces 35 gpm at about 65 psi (~ 150 feet of head). Good for small-medium 30 psi spray zones.
3. Based on the well's capacity, the size of your site, and the pressure required for your emission devices, choose a pump. A VFD is a good thing to have.
4. Filtration is a good idea with well water.

Good luck! Let us know what you choose. Maybe give us a little site info, too.
more than a month ago
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#4197
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Thanks Tom,

Pinning down the variables isn't a problem. The real question is, If I use the pressure listed on the pump for any given GPM does that work for the Static pressure input in Land FX?

Example:

1.5 hp pump delivers 35 GPM @ 150 ft of head approx. Do I use the 150 ft. head less the draw down elevation as the static pressure in Land FX, or do I use the pressure listed at the 0 GPM rating on the curve as the Static pressure 225 ft. of head in this case?

Thanks for your help.
more than a month ago
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#4202
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Use the 150' of head. The 225' point is known as shut-off head, that is, the pump is working as hard as it can, but it can't push water higher than 225'. Or in other words, no flow after that point.
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