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Thread: Constant Pressure Controller

  1. #1

    Constant Pressure Controller

    I have a well 486 feet deep. From the well to the house is about 200 feet up hill. There is #10 wire from the house to well, and 200psi poly pipe from the house to the well. My question is what size pump and what size CPC to use and why. Also the well produces 3gpm and the water is about 80 feet from the bottom. Its a new install.

  2. #2
    Pump guy speedbump's Avatar
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    quote:I have a well 486 feet deep. From the well to the house is about 200 feet up hill. There is #10 wire from the house to well, and 200psi poly pipe from the house to the well. My question is what size pump and what size CPC to use and why. Also the well produces 3gpm and the water is about 80 feet from the bottom. Its a new install.
    How much vertical is the 200 feet uphill?

    If it were me, I would be looking at a cistern. You only have about 60 feet of water in that well to work with and at only 3 gpm, you will run the risk of running the pump dry quite often.

    bob...

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  3. #3
    Its proabably 15 or 20 degrees up hill. The coustomer has already bought the cpc and its non refundable where he bought it. Where its going to be installed is a hunting cabin so there won't be much water useage. Somebody else started the job and I'm jumping in to trying to figure out what the other guy had going on.

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    Pump guy speedbump's Avatar
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    Ok, who can do the math on the 15 or 20 up hill for 200 feet. Quick, surely someone can do that without a calculator. But not me.

    Loutermilk, what is a CPC?

    bob...

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  5. #5
    Bob, I'm guessing that a CPC is a Constant Pressure Controller, which is the subject line of this thread... However if you go to the Goulds pump site, they don't define it, but I saw it used in a sentence as CPC Controller, which doesn't make sense. Just a guesstimate at the elevation change... 45 deg would be 200' rise, 15 deg is 1/3 that, so my guess is 65-75'.

    Rancher ... sorry batteries are dead in the old HP 41CX

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    Pump guy speedbump's Avatar
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    I didn't think to look at the topic John. Duh!

    So now that I know that and the elevation difference we can proceed. You can go with a 3/4hp pump #10 wire for a distance of 760 feet. With a 1hp they recommend no more than 630 feet.

    The pump I come up with is a 1.5 that will produce just over 3 gpm at 620 feet. That is your well depth of 480 plus 30 psi. and Ranchers 70 of vertical distance up the hill. This pump will make plenty more pressure for shut off.

    I don't recommend constant pressure pumps, I recommend the Cycle Stop Valve instead.

    The big problem I see is volume. I don't know what diameter your well is, but lets say it's a 6" well. With only 80 feet of water above the pump and at 1.5 gallons per foot in the casing only being replaced at 3 gpm. That's not a lot of water. You will have to be careful how you use it. No 3 hour showers for the teenagers.

    bob...

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