1. jcarman104

    jcarman104 New Member

    Jun 4, 2006
    Ok guys and gals I have a question... I have a weltrol wx 250 tank and on the side it says the tank is precharged to 30 psi............Does this mean when the tank is empty it should have 30psi at the air valve? The pump comes on at about 34psi and shuts off at 50psi. there is no water comming from the air valve when he tank is full...but it seems my water pressure drops as the tank level drops when I have a spigot open in the house...I emptied the tank with the pump off and the air pressure at the valve went to 0..My house sat empty for a few years and I was wondering if the tank may have lost its air charge. The pump is mounted on the top of the tank (if this configuration makes any difference)..Thanks for any help!!
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    You have to measure the tank pressure when th epump turned off and a valve open until the water stops flowing. It should be charged to 2# less than the pump turn on pressure. The system pressure will go from the turn-on point to the max pressure then stop when the pump stops. If you dont' use any water, it should stay there. The tanks stores energy from the pump, and when you open up a valve, it drains off that stored energy when the water is discharged until the pump starts again. If it ever gets to zero in normal circumstances, something is wrong. If the tank, when check properly, gets to zero, there is a leak in the tank.
  3. Sponsor

    Sponsor Paid Advertisement

  4. speedbump

    speedbump New Member

    Jul 15, 2005
    Water well and pump tech.
    Riverview, Fl.
    This is where the constant pressure valve comes in handy, it won't let the pressure drop once the pump is running. And you can dial in your own pressure.

Similar Threads: Precharge
Forum Title Date
Pumps and Tanks Well Forum & Blog. Water is life. Getting precharged tank pressure exact Jun 13, 2016
Pumps and Tanks Well Forum & Blog. Water is life. Maker's recommendations on checking precharge ? Oct 26, 2015
Pumps and Tanks Well Forum & Blog. Water is life. Using a pressure gauge with lazy hand to check for too much precharge Jun 8, 2014
Pumps and Tanks Well Forum & Blog. Water is life. Setting Precharge on Tank May 15, 2008

Share This Page