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Thread: Brand new to tubbing, help!

  1. #11
    Join Date
    Nov 2013
    Location
    Princeton, MA
    Posts
    431

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    Shane, were you able to measure vacuum at the top of the problem line? I assume that you get good natural vacuum on your 8% slope. Maybe the long flat 3/16 tubing at the end reduces it. If so, could you put the collection tank at the bottom of the steep part, and pump it out through a transfer line when full. Seems like that way you get the advantage of natural vacuum but not the downside of the flat run. Just a thought. Might be an interesting test.

    Dave
    Mountain Maple farm
    2021: 260 taps, 70% red maples. Mountain Maple S4 diaphragm pump controller with automated sap transfer and text messaging
    New website:
    https://www.mountainmaplefarm.com
    https://www.facebook.com/MountainMapleFarm/

  2. #12
    Join Date
    Feb 2016
    Location
    Peru, Maine
    Posts
    791

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    We did not have a vacuum gauge there last year. We could do as you suggest, would lose a couple taps doing so. Moving the collection tote would also make it a little harder to access. We pump from the tote now, it doesn’t run to the sugar house. Going to experiment some more for sure.
    270 taps on 2 Shurflo's, 31 taps on 3/16" and 120 taps on gravity. 421 total for 2021 season.
    Mountain Maple S3 controller for 145 of the vacuum taps
    2x6 Darveau Mystique Oil Fired Evaporator w/ Smoky Lake Simplicity Auto Draw
    Wesfab 7” filter press
    IBC totes in the woods, 800 Gallon CDL bulk tank at the shack

  3. #13
    Join Date
    May 2009
    Location
    UVM Proctor Maple Research Center, Underhill Ctr, VT
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    5,696

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    Quote Originally Posted by Biz View Post
    ...could you put the collection tank at the bottom of the steep part, and pump it out through a transfer line when full. Seems like that way you get the advantage of natural vacuum but not the downside of the flat run.
    Excellent suggestion Dave. If it doesn't create too many other issues with pumping, this would be the way to go. You could run 5/16" tubing to pick up any trees on the flat ground.
    Dr. Tim Perkins
    UVM Proctor Maple Research Ctr
    http://www.uvm.edu/~pmrc
    https://mapleresearch.org
    Timothy.Perkins@uvm.edu

  4. #14
    Join Date
    Nov 2020
    Location
    Manitoulin Island, ON, Canada
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    1

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    I'm new to this hobby but had good success this past season. Ran 6 runs of 3/16" tubing with 20 taps on each for a total of 120 taps with minimal overall slope maybe 1% and 1-2' of drop from each of the last taps. Each of the 6 runs are similar at 400-500' in length.

    I decided to build a small vacuum system using a Shurflo 4008 with some logic to turn the pump on and off based off outside temperature as well as a timer to control what time of day the pump was allowed to run. We had an odd season with many days not going below freezing and I didn't want the pump to run all night based of temperature alone to save the deep cycle battery from going low. In my mind I felt the 3/16' tubing would be a better fit over the 5/16" since the principle of a more continuous column of sap could be an advantage to the Shurflo pump similar to natural slope gravity. I suppose there is the devil of parasitic type drag within the line but still I couldn't be happier with the overall results with consistent 23-25" of vacuum at the top end of each line during decent runs.

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