Submersible troubleshooting....

Discussion in 'Pumps and Tanks Well Forum & Blog' started by Mike M2, Apr 19, 2014.

  1. Mike M2

    Mike M2 New Member

    Messages:
    4
    Location:
    Gambrills, Md.
    I have noticed lately a lack of the normal pressure in my system. I have a deep well with a 220v pump and have had it out a few times for misc. reasons. The pump is about 15 years old.
    Here's what I know, the pump is continuously running. Looking at the gauge I see it is holding a steady 30psi. I tested for leaks by turning the water off just after the pressure switch and turned the pump off. It still holds 30psi steady so I know there are no leaks anywhere. I kick the pump on and it may gain a pound or two at the most but still runs due to not hitting the peak pressure. My guess at this point is the pump is not performing as it should.
    I can replace it no problem, BUT I have a question! When a well guy replaced it 15 years ago he mentioned to me that I needed a special pump diameter due to the galvanized pipe having buildup inside it from age. Was he BSing me? I can't seem to find any info online about any diameter pump other than a 4 inch. Can anyone help shed some light on this? Thanks....
  2. Reach4

    Reach4 Active Member

    Messages:
    1,930
    Location:
    IL
    That well guy may have been referring to a "trimline" pump if you are talking about the current pump. If he was referring to your next pump, I expect he was referring to the Grundfos SQ series. It will fit into a 3 inch casing
    Last edited: Apr 21, 2014
  3. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,239
    Location:
    Land of Cheese
    If the piping between the pump and your pressure tank has a check valve in it, you could still have a leak between the pump and the check valve.
  4. craigpump

    craigpump Member

    Messages:
    857
    Location:
    ct
    Either a leak between the pump and tank or the pump is tired
  5. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,840
    Location:
    NW Ontario, Canada
    Have you noticed if the water is not as cold as it used to be? A leak in the downpipe can recirc the water enough to warm it.
  6. Mike M2

    Mike M2 New Member

    Messages:
    4
    Location:
    Gambrills, Md.
    Today I went over it all and i'm convinced the pump is the problem. Should not be a downpipe problem as the system keeps it's pressure when I turn off the pump. I actually replaced the entire downpipe last year due to a small hole near the pump.
    The pressure will get up to about 42psi tops without the switch turning it off. If I use water it may drop to the upper 30's but goes back to 42 afterwards, pump never turning off. For now I am turning the breaker on and off as I need water until the new pump comes in.
  7. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,840
    Location:
    NW Ontario, Canada
    Unless you have more than one checkvalve.
  8. valveman

    valveman Moderator Staff Member

    Messages:
    4,388
    Location:
    Lubbock, Texas
    And you probably screwed a galvanized nipple into a brass or SS check valve and already have this same problem again.
  9. craigpump

    craigpump Member

    Messages:
    857
    Location:
    ct
    Those SQ pumps spin at 10,000 + rpm. Fifteen years, a little grit and it could be wiped out, of course if you have a galvanized nipple in there someplace that could be your issue as well.
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