Pressure Gauge goes over 100psi!

Discussion in 'Pumps and Tanks Well Forum & Blog' started by masterdiy, Nov 29, 2008.

  1. masterdiy

    masterdiy New Member

    Messages:
    10
    Location:
    North Carolina
    My systems was suddenly sending high pressure water to the faucets. The pump would run to the designated 60PSI and shut off. But the pressure gauge would continue to rise past 80PSI!.
    Upon inspection I found the Well-Trol 40gal tank had seen it's better days, the bladder had burst, so I replaced it.
    After installing the new tank and bleeding off the air in the system I noticed the pump was cutting off at 55 PSI ( I lowered the cut off switch just a bit) but the gauge would continue to rise after the pump went off! Once it went farther than the gauge registered!!! Even after adjusting the pressure switch to cut on @ 38psi (the new tank says 2# under it's pressure of 40#), and cutting off at 50psi, the gauge still will continue to rise after the pump shuts off! Now, I see the contacts open and close, as well as hearing the pump actually shut off and on as I am watching the gauge. So, what the heck?
    Mystery........
  2. valveman

    valveman Moderator Staff Member

    Messages:
    4,464
    Location:
    Lubbock, Texas
    Last time that happened to me, there was a buried pressure tank that no one knew about. After the pump shut off, the other pressure tank would continue to feed more pressure to the new pressure tank. It is either something like this or, the pump is not really shutting off like you think.
  3. masterdiy

    masterdiy New Member

    Messages:
    10
    Location:
    North Carolina
    Buried pressure tank? Wonder why would that be the case?
    I'd bet my life on the pump going off....as I look at the contacts fully disengage and I can hear the pump stop running, I'm positive the pump is off...
    I can follow the line right to the hole in the ground. There's no such thing as a pressure tank in the hole....hope no one takes an opportunity for a little fun with this one. It could turn out to be very expensive.....
  4. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,246
    Location:
    Land of Cheese
    The pump is the only thing that might be able to make that kind of pressure. Are you certain the gauge is working properly?
  5. masterdiy

    masterdiy New Member

    Messages:
    10
    Location:
    North Carolina
    3 stories

    Pump is off! You can hear it run and then shut off...There's no way a pump keeps running after the electricity is cut off from it and you can hear it stop running.
    So, I wonder if the two stories above the basement would have any way of building backpressure that would somehow register at the gauge? Since the plumbing (gauge, tank, and switch) are in the basement bathroom closet, I quickly open some faucets and flush a toilet when the pressure goes up over 100psi to relieve the pressure. The water does come out very strong and the gauge recedes as I let pressure off.
    Of course I get one that no one has ever heard of...typical for my diy!
  6. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    The gauge may be clogged with crud causing it to lag in the readings.
  7. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,246
    Location:
    Land of Cheese
    Nope- even if the building was 5 stories high you would not get 100psi. There is nothing in a solitary well system that can develop 100 psi other that the pump.

    Any chance the home is hooked to a second water source? Sometimes people buy a house that is cross connected to an old shared well or city water and don't even know it.
  8. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,246
    Location:
    Land of Cheese
    You have this backwards too.... your bladder tank must be set to at least 2psi less than your pump cut-in pressure. Make sure your water pressure gauge is correct. Drain your tank of water and check the air charge. (Don't assume it is right just because the tank is new. Make sure your air gauge is correct.

    If you don't have the base air and water pressures set properly, the system will not work properly.
  9. wondering

    wondering Member

    Messages:
    106
    You said you have your switch set for 38/50. At some point you need to adjust that for at least a 20 lb difference to keep from shortening your pumps life.

    Hope you find the cause of your high pressure but it sounds like it may be coming from an outside source.
  10. Any chance you live on the hill ? if the pump is up the hill and the pressure tank / pressure switch located at lower spot .,

    If so read on .

    The gravity will push it down and make more pressure than you need to.


    The other possbilty that you have the pump quite away from the house and take a little while to get all the water move something like at the pump itself maybe running near max designed pressure and down the way the pressure gradually dropped to the house so like example at the pumphead will run at 100 PSI go a ways to the house the pressure dropped down to about 50 or so due the pipe size unless you got one of big pipe.

    And one of the reader say possiblty you got other source somewhere else if that the case and possiblty you may have bad pressure regualtor { only if ya on city water }

    Merci,marc
  11. masterpumpman

    masterpumpman New Member

    Messages:
    729
    Location:
    Virginia Beach, VA
    You need a qualified professional!

    This sounds like a serious problem and by your description, not something a DYI should be trying to rectify.

    I recommend that you call a qualified well pump professional and advise them of your concern. They may be able to ask you the proper questions and give you a solution over the telephone or it may require their on site observation.

    Either way it sounds as though you have an unusual and serious problem.
  12. speedbump

    speedbump Previous member

    Messages:
    4,540
    Location:
    Riverview, Fl.
    I have never been able to get a pressure switch to go much below a 17 lb pressure differential. You said you have it set 38/50. I doubt that; and that leads me to believe your gauge is not telling you the truth. I'm not doubting the higher pressure, just your instruments. A good tire gauge for the tank and a very good pressure gauge for your water system might be the first things to replace before any more testing is done.

    bob...
  13. masterdiy

    masterdiy New Member

    Messages:
    10
    Location:
    North Carolina
    new gauge?

    Can you just got to the hardware store, Lowe's or Home Depot, etc, and screw on a new gauge?
    Isn't the gauge connected somehow to the pressure switch?
    It does sound like the pressure gauge isn't reading right. I put it at 40-60 and now when it gets to 40 there is NO pressure in any faucets. Even thought the gauge shows 40psi, no water runs out of the system and the pump won't kick in for about 30 seconds...

    thanks!
  14. speedbump

    speedbump Previous member

    Messages:
    4,540
    Location:
    Riverview, Fl.
    Yes you can just replace the gauge. It has nothing to do with the pressure switch. It's just an instrument to tell you what pressure is in your system.

    I'm not sure what's going on with no pressure and the pump not turning on for 30 seconds except for the possibility of a plugged pressure switch line.

    bob...
  15. masterdiy

    masterdiy New Member

    Messages:
    10
    Location:
    North Carolina
    OK, thanks. I'm going to the hdw store to get a new gauge now. Is there some way to "clean" out the switch line???
  16. speedbump

    speedbump Previous member

    Messages:
    4,540
    Location:
    Riverview, Fl.
    Yes, it depends on what it is. Could be plastic tubing, copper tubing, brass or galvanized nipple or who knows what. But those plumbing items that feed pressure to the switch may be plugged and taking them apart and inspecting them is the only way you will know.

    bob...
  17. masterdiy

    masterdiy New Member

    Messages:
    10
    Location:
    North Carolina
    alright! cool.
    I'm trying that now...

    thanks
  18. masterdiy

    masterdiy New Member

    Messages:
    10
    Location:
    North Carolina
    the problem is solved.
    the stem where the gauge and switch attach was so clogged I don know how any water was getting through! After cleaning out that little pipe, all works perfect again.
  19. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,246
    Location:
    Land of Cheese
    Thanks for following up to let us know what you found.

    Sometimes it's the simple things that are the hardest. ;)
  20. PCBlaylock

    PCBlaylock New Member

    Messages:
    1
    Location:
    Western North Carolina
    I had the same problem!

    This blog just helped me solve my water problems too!!!! The symptoms were the same and the problem was the same. The small pipe to the gauge and pressure switch was completely clogged. Thank you so much for making this information available.
    Last edited: Nov 9, 2013
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