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Thread: well pressure gauge

  1. #1
    DIY Junior Member sherr's Avatar
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    Default well pressure gauge

    how long does it take for the pressure gauge to go from 60 to 40.... starting at 60, I turn on the the kitchen faucet , my gauge takes 1 and 1/2 minutes to drop to 44-45 , then clicks on goes up to 62 or 63 then clicks and starts going down again... IS THAT NORMAL amount of time . seems like its quick. my old well pump and gauge was 37 to 62. I thought it was longer than 1.5 minutes too. can you help me?

  2. #2
    DIY Senior Member Reach4's Avatar
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    Depends. If you drew 4 gallons, that would correspond about a 15 gallon pressure tank. If your tank is 30 gallons, then it might benefit from topping off the air pressure (on empty tank) to 40 PSI). You could consider a bigger tank. How long does the pump run each time?

    You could also consider a pressure switch with a wider range... maybe 35 to 65 or 30 to 60.

  3. #3
    Sprinkler Guy Wet_Boots's Avatar
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    Can't you widen the range on the Square D switch? They still got that little spring adjustment alongside the main one?

  4. #4
    DIYer, not in the trades LLigetfa's Avatar
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    Without knowing the GPM you faucet produces, and without knowing the size of the tank, we cannot say what is normal. You need to measure how many gallons of water you can draw from pump turn-off to pump turn-on. Then you compare that number with the specifications for your tank. That will give an indication whether there is a problem with the bladder or precharge.

  5. #5
    Moderator valveman's Avatar
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    When I see a pressure switch with the bandwidth widened more than 20 PSI, as with the 35/65 setting, I know cycling on/off has been a problem and someone is trying to slow it down. Widening the pressure switch bandwidth or installing a larger tank only slows down the cycling somewhat. The pump will still cycle unless you open up enough water to use as much as the pump can produce, which is rarely practical.

    Cycling every 45 seconds is not good, 1.5 minutes is not much better. A CSV would make the pump stay on for as long as the kitchen sink or anything else is running. A pump/motor only has so many cycles built into it. The sooner you use up those cycles the sooner you will need a new pump.

    A kitchen sink usually only requires about 2 GPM, so you either have only about a 10 gallon size pressure tank, or the bladder is already busted. Bladders in tanks also break from the pump cycling on and off. This causes the bladder to bend back and forth with every cycle until the bladder breaks like bending a piece of wire until it breaks.

  6. #6
    DIYer, not in the trades LLigetfa's Avatar
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    Widening the band will also hasten the bladder's demise.

  7. #7
    Moderator valveman's Avatar
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    Quote Originally Posted by LLigetfa View Post
    Widening the band will also hasten the bladder's demise.
    Started to mention that but was already being long winded. Yes overstretching the bladder is not good and overstretching and cycling is double bad.

  8. #8
    DIYer, not in the trades LLigetfa's Avatar
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    A bit of a digression, but if one has a CSV and a large tank, I suggest that the band actually be narrowed as much as the switch allows.

  9. #9
    Sprinkler Guy Wet_Boots's Avatar
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    Pardon the throw-in, but how much trust is placed in the exact reading on a brand-new pressure gauge from the box? I've never tried any side-by-side comparison tests from a carton of gauges. Trust in gauge readings was a concern in olden days, when trying to eliminate cycling with sprinkler systems, with pressure tanks usually having 75 psi ratings.

  10. #10
    DIYer, not in the trades LLigetfa's Avatar
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    OK, I'll bite... I have two dial type gauges, an electronic pressure switch with pressure readout, and I can sample the air pressure on my tank. All four readings in my case are within 2 PSI.

  11. #11
    DIY Junior Member sherr's Avatar
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    hi, thanks for all the conversation....I am trying to figure out if I need to call my well/pump company . do I have a problem or not ? I had a new pump put in may. they also ''blew'' the well clean. and raised my well cap. and a new pressure switch. I hear it come on as it is in my closet off the kitchen. my well-x-troll water tank is out back under ground near the well. I don't know the tank size or model no. the tank is more than 20 yrs old. i'm really just wondering if my pump comes on too much. I could hardly hear my other pressure switch and this new one is loud , so maybe I just hear it now. how do I tell if something is wrong with the switch or the tank. when I don't use water it ''holds'' where it left off.

  12. #12
    DIY Senior Member Reach4's Avatar
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    Quote Originally Posted by sherr View Post
    hi, thanks for all the conversation....
    Yeah, conversation... How much water (gallons) do you draw before the pump comes on?
    How long does the pump run when it does come on if you stop drawing water?

  13. #13
    Moderator valveman's Avatar
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    Quote Originally Posted by valveman View Post
    so you either have only about a 10 gallon size pressure tank, or the bladder is already busted.
    If your tank is larger than a 10 gallon kitchen trash can, then it is bad and needs to be replaced.

  14. #14
    Jack of all trades DonL's Avatar
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    If you buy a $10 gauge, You get what you pay for.

    + or - 5 percent of full scale may be your margin of error.

    A gauge centered at normally operating pressure will give better accuracy. Measuring 30 psi on a 120 psi gauge is hard if you expect it to be exact.


    Placement of the Gauge DOES mater.


    More info needs to be plugged into your formula.
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

  15. #15
    Sprinkler Guy Wet_Boots's Avatar
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    the 75 psi tanks were sometimes a bother when an old sprinkler system wouldn't stop cycling, even with the cut-off set above 60 psi. I'd try to change field components before I'd balance at a cut-off setting above 70 psi.

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