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  1. #1
    Join Date
    Feb 2009
    Location
    Portland OR
    Posts
    1,845

    Lowboy Geothermal with horizontal boring/directional drilling

    This system was finished up the end of March and is an Envision dual capacity 3 ton split system that we turned into a low boy, we also sealed the ductwork, insulated the ductwork and added a desuperheater.
    The video of the horizontal bore can be viewed here.


    We also perform live energy monitoring on this unit via a WELserver so you can see if the unit is running, the EWT/LWT and desuperheater, refrigerant and air temperatures all in realtime with approximate COP calculations(not fully functional yet)
    http://www.welserver.com/WEL0626
    Check out my YouTube channel - http://www.youtube.com/user/skyheating1 We have customer testimonials, product reviews and more!
    Like us on FACEBOOK if you like our advice here!

  2. #2
    Join Date
    Apr 2012
    Location
    Georgetown Delaware
    Posts
    197
    Nice looking work!
    How much seperation did you have between the loops? The trench the loops were inserted into seemed short? Does the directional bore fan out from that initial ditch? Last question is about grout. Does the drill backfill the bore when extracting the rods with a grout or do they use the native material in a slurry?
    Eric

  3. #3
    Join Date
    Feb 2009
    Location
    Portland OR
    Posts
    1,845
    The lines are close only about 3 feet apart so not only do they fan out byt the first line is 15'the deep at the end and the second is 30'the deep and it keeps alternating. Its not 100%only grout its 50%on grout and 50%the slurry mixture.
    Check out my YouTube channel - http://www.youtube.com/user/skyheating1 We have customer testimonials, product reviews and more!
    Like us on FACEBOOK if you like our advice here!

  4. #4
    Join Date
    Apr 2012
    Location
    Georgetown Delaware
    Posts
    197
    Thank you for the reply I have been curious about this for some time and no one has been willing to share specs. Alternateing depth makes good common sense to me. Did the driller use the cost prohibitive grout that is enhanced with graphite, or standard grout?

    Everyone made alot of noise about the grout with graphite, but I have yet to see it used un less it spec'd on a commercial project.
    Eric

  5. #5
    Join Date
    Feb 2009
    Location
    Portland OR
    Posts
    1,845
    It was a bentonite grout mixture as we were not trying to get as efficient as a vertical due to about a 12' average depth and cost of 100% grout was a little cost prohibitive vs drilling an extra few feet after liquid waste disposal and spillage onto the property of extra materials.
    Check out my YouTube channel - http://www.youtube.com/user/skyheating1 We have customer testimonials, product reviews and more!
    Like us on FACEBOOK if you like our advice here!

  6. #6
    Join Date
    Mar 2012
    Location
    West Berlin, NJ
    Posts
    59
    Same question I had too Eric,
    There is a Horizontal bore guy in my area who uses NO grout in the loop field. He claims it "Works fine".

  7. #7
    Join Date
    Feb 2009
    Location
    Portland OR
    Posts
    1,845
    Quote Originally Posted by CallaDrilling View Post
    Same question I had too Eric,
    There is a Horizontal bore guy in my area who uses NO grout in the loop field. He claims it "Works fine".
    Well if there is enough pipe in the ground you don't need grout, just fill the holes in with slurry. I use 800' per ton in horiztol loop, 600 feet per ton horizontal bore and 400' per ton vertical as a rough number before checking soil and loop sizing programs.
    Check out my YouTube channel - http://www.youtube.com/user/skyheating1 We have customer testimonials, product reviews and more!
    Like us on FACEBOOK if you like our advice here!

  8. #8
    Join Date
    Mar 2012
    Location
    West Berlin, NJ
    Posts
    59
    I am assuming your talking total pipe length.
    We start out with 180'/ton 1"loops, or 200'/ton 3/4" loops.
    Seems like its fairly similar. We drill mainly through sand, and clays here.

  9. #9
    Join Date
    Feb 2009
    Location
    Portland OR
    Posts
    1,845
    Quote Originally Posted by CallaDrilling View Post
    I am assuming your talking total pipe length.
    We start out with 180'/ton 1"loops, or 200'/ton 3/4" loops.
    Seems like its fairly similar. We drill mainly through sand, and clays here.
    Yes total pipe length so 200' vertical is 400' of pipe.
    Check out my YouTube channel - http://www.youtube.com/user/skyheating1 We have customer testimonials, product reviews and more!
    Like us on FACEBOOK if you like our advice here!

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