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Thread: actual vacuum

  1. #1
    Join Date
    May 2018
    Location
    northern n.y.
    Posts
    10

    Default actual vacuum

    Hello, I realize the more vacuum the better, and that the gauges in the shed are different from those at the end of a lateral, and there are many other variables, such as biometric pressure, releasers, pumps, numbers of taps , slope ,etc. but what are the real life levels of day to day vaccum (inches) people are seeing ? We have 27/28 in the shed, less in the woods and a spirited debate about getting more. Just looking for some numbers to compare. Thanks emti

  2. #2
    Join Date
    Mar 2017
    Location
    Vermont
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    316

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    My monitors say I'm pulling 26.5 in the house and 26 in the woods. Only one line in the red. 1600 ft conductor 2000-2500 foot 3/4 inch mainlines.
    Remember to keep on ticking while the sap is dripping.
    2016- 50 buckets. Made 4 gallons.
    2022- 3750 taps + Smartrek! Made 1300 gallons.
    2023- 3750 taps after removing a pump house and connected two woods. Made 800 gallons.

  3. #3
    Join Date
    Nov 2013
    Location
    N.E.Ohio
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    247

    Default

    In my opinion if you’re getting 28, thats about it realistically. To get a consistent 28.5 or better is just not realistic with tree gasses, and micro leaks. The smallest of all the leaks will drop you when you get above 28. And guys that say they are always getting 29.9 all season are probably the ones who also always catch the biggest fish.

  4. #4
    Join Date
    Mar 2006
    Location
    west virginia
    Posts
    969

    Default

    The Biggest Fish perfect explanation kh7722, if they have 29 hg they are tapping at the beach, max vacuum at sea level 29.92.
    Mark 220 Maple
    1100 taps on low vaccum, 900 on gravity.
    900 plus taps leased and on high vacuum
    35 cfm Indiana Liquid Ring Vacuum Pump
    80% Sugar, 20% Red MAPLES
    http://s247.photobucket.com/albums/g...Maple%20Syrup/

  5. #5
    Join Date
    May 2018
    Location
    northern n.y.
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    10

    Default

    thank you.

  6. #6
    Join Date
    May 2009
    Location
    UVM Proctor Maple Research Center, Underhill Ctr, VT
    Posts
    6,413

    Default

    It becomes a matter of economics (both actual cost and labor cost) when you get into high vacuum. Pumps capable of pulling that kind of vacuum get progressively more costly (and are progressively less tolerant of moisture). Maintaining a tight tubing system in the woods is more difficult above that. Proper operation and normal wear-and-tear on equipment is high with higher vacuum levels (pumps in electric releasers don't work very well when vacuum is really high). Basically if you can get to 25+" Hg (in the woods), that's great and it is readily doable, affordable, and results in decent economic returns. Getting beyond that the cost and time required start to increase quickly. Some people can do it and maintain it (and all the power to them), but they do work at it.
    Dr. Tim Perkins
    UVM Proctor Maple Research Ctr
    http://www.uvm.edu/~pmrc
    https://mapleresearch.org
    Timothy.Perkins@uvm.edu

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