Pump volume and pressure question

Discussion in 'Pumps and Tanks Well Forum & Blog. Water is life.' started by djdixon1995, Jan 17, 2008.

  1. djdixon1995

    djdixon1995 New Member

    Jan 12, 2008
    I'm getting about 5 GPM (using a bucket and a watch) and mediocre pressure from my well. It's a 1/2 HP pump into a tank with 40 PSI reading on the tank pressure guage. Is there a way to improve the volume and pressure?

    I'm guessing volume is a function of the pump so I'd have to get a bigger pump to get more water.

    Can the pressure switch or the tank precharge be adjusted in order to increase the pressure from the faucet?

  2. Rancher

    Rancher Guest

    Are you measuring the output of the pump, or the output of the tank? i.e. did you isolate the tank and just capture the water out of the well? What kind of pump, submersible or above ground jet?

    What is the range of the PSI on the pressure guage when the pump cycles, 20/40? If so yes you can adjust that switch to turn off at a higher pressure, but depending on your answer for what kind of pump you have, it may not be able to pump that high.

    Volume is a function of how many impellers the pump has if it's a submersible pump, and how big the pipe is. Volume at the house is also a function of how high the pressure is at the tank.

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  4. pitless

    pitless Well Driller, pump installer, engineer

    Jan 13, 2008

    Volume is the thickness of the impellers. Pressure is the result of more stages or impellers.


    You need to be more specific. Do you get 5 gpm at 40 psi. Or do you start at 40 psi and then the pressure drops as you draw the water.

    Rancher is right in asking how you measured your flow rate. Just sampling from a faucet may show many different types of problems. Such as a valve partly shut off can result in low pressure when the well and system is fine. Also rusted water lines or fittings can cause problems.

    Can you pump straight from the well and determine the water level? This would give the capacity of the well and indicate if you have probems in your water system.
  5. speedbump

    speedbump New Member

    Jul 15, 2005
    Water well and pump tech.
    Riverview, Fl.
    Assuming you have a jet pump. 6 gallons per minute at 40 psi with a lift of 10 feet is about what can be expected from a 1/2 hp.

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