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Stump the Professor....

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Mark Eatherton
Mark Eatherton Member Posts: 5,853
in THE MAIN WALL
If you are in the Denver area, and you want to learn, and have a good time, get a FREE dinner, and possibly win a brand new variable speed pump, you need to be here.



See you there!



ME

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Comments

  • Dave Stroman
    Dave Stroman Member Posts: 765
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    Stumper

    I will try to make it, Mark.  I am sure I cvon come up with a stumper.

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  • Unknown
    Unknown
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    Actually,,,,

    who really cares, except  to hear the GREAT ME come-up with his impeccable knowledge,,,,, give me a break!
  • TonyS
    TonyS Member Posts: 849
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    I cant make it to Denver

    But I have  a stumper for you. It stumps me every time I see one.

    This is not really heating but more refrigeration, so here goes...



    The small gauges that screws on to your 5 gallon propane tanks for your grill. They tell you how much propane you have left. They have no diptube or insert into the liquid in any way. How do they tell how full the tank is if the temperature-pressure remain constant to the last drop of propane?
  • Alan R. Mercurio_3
    Alan R. Mercurio_3 Member Posts: 1,620
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    My guess!

    Tony, I’m only guessing here. But I would think in the given space (20lb cylinder) the volume (amount of gas) would create a known pressure, thus the pressure would indicate the current volume (amount of gas) left in the tank.

    Wish I could make it to Denver, God knows I'd learn a lot from ME!

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  • TonyS
    TonyS Member Posts: 849
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    Cant be Alan

    because propane like any refrigerant will maintain a constant pressure-temperature relationship as long as there is any liquid left in the can. Therefore it doesnt matter how much liquid is left in the can the pressure will remain the same. This is why larger propane tanks have float assemblies on them. But these gauges have no way of knowing where the liquid is. They are simply placed in the pressure line.
  • Alan R. Mercurio_3
    Alan R. Mercurio_3 Member Posts: 1,620
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    Gosh darn it!

    I guess that blows my theory. I better stick to oil heat related subjects :)

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  • TonyS
    TonyS Member Posts: 849
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    Heres a link to one

    http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=66940
  • Dave Stroman
    Dave Stroman Member Posts: 765
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    Free dinner

    I'm going for the free dinner.

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  • Tim Potter
    Tim Potter Member Posts: 273
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    I say..

    I say its full for a really long time, then right before you need propane (while the steaks are on) it drops to empty/replace.



    Tim
    Winter Park, CO & Arvada, CO
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,539
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    I like this guy's answer:

    http://answers.yahoo.com/question/index?qid=20081020223136AAuJ4Bx



    And 20 years in the propane biz!
    Retired and loving it.
  • TonyS
    TonyS Member Posts: 849
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    For as long as Ive thought about them

    I never actually bought one. Ill have to get one and see how well it works. But maybe that is the answer, it just waits till the liquid is gone and measures the gas pressure that is left. And Im sure that goes fast at 80,000 btus.
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