Highest recorded water pressure…

Yesterday evening I turned off the well pump, the tank level showing 2000 gallons. This morning I looked at the resting water pressure…


…and it’s indicating 19 psi, the highest I’ve ever seen. Probably I could get it a hair higher if I filled the tank to the cupola. As I’ve mentioned before, for some reason the indicated pressure is higher in the morning than the evening. Increased density, maybe? Doesn’t really matter.

This is mostly private to BB, I don’t know if anybody else is really that interested…

About Joel

You shouldn't ask these questions of a paranoid recluse, you know.
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13 Responses to Highest recorded water pressure…

  1. Paul Joat says:

    I still think it might have more to do with the temperature of the gauge, the density of water doen’t change that much with temperature and the water temperature can’t change all that fast.

  2. DaveS says:

    I have been following the “story of the mysteriously changing pressure gauge” as well. I didn’t major in physics, but so far, my money is on the variability being introduced BY the gauge,

  3. Perhaps as the day heats up the plastic material of the tank becomes less rigid and slightly more flexible, allowing the tank to bulge a bit and increase in volume, thus reducing the pressure within.

  4. eriko says:

    It the tank is sealed the increased air temp a the top of the tank will pressurize the system.

  5. Cliff says:

    Rising and falling barometric pressure assuming the tank is vented? Check and see if the pressure decreases when a storm is coming in.

  6. Joel says:

    The tank is definitely not sealed.

  7. Tennessee Budd says:

    According to my copy of the ‘Pressure Gauge Handbook’ (in my job, I use it) says that temperature-caused range shift can cause changes as much as 2% of indicated reading for each 100 degrees of change: much less than the change you’re seeing, & that’s change in temp of the gauge, not the indicated substance.
    Has this gauge ever been dropped or overpressured, Joel?

  8. Joel says:

    Not that I know of. I got it new and didn’t mistreat it, but I can’t speak for transit. I have no evidence it was ever knocked.

  9. terrapod says:

    My 2 cents but I still suspect that there is air in the line to the gauge.

    Old style bourdon tube oil filled temp gauges that were used on cars up through the early 60’s had to have a sealed oil filled line between the bulb in the coolant stream and the gauge on the dash, any air and it would not be accurate.

  10. Joel says:

    Looking at the way I installed it, there pretty much has to be air in the line. It’s a straight vertical pipe full of air with no way to bleed it off.

  11. terrapod says:

    Actually, very easy to bleed, just gently unscrew the gauge from the fitting to the pipe to the point where air leaks out the threads, then when it turns to water with no bubbles, tighten it right up. I do this all the time when bleeding diesel injectors :-)).

  12. Jerry says:

    Science! Of course we’re interested.

  13. Winston B Smith says:

    It’s the Russians

To the stake with the heretic!