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20bbl Lauter Tun Draw-off, # and size.

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  • 20bbl Lauter Tun Draw-off, # and size.

    Lauter Tun design:
    Im looking at 20bbl Lauter tuns with knifes + rake, flat bottoms and under-screen wash-heads. Those of you with 15-30bbl systems, what are the size and number of draw-off points you have (and who manufactured the tun)? Would 4, 1" ports be enough? Is it mostly flat, or have some dish/slope for a larger center drain?
    Thanks in advance.
    Last edited by Ted Briggs; 04-01-2015, 08:45 AM.
    Brewmaster, Minocqua Brewing Company
    tbriggs@minocquabrewingcompany.com
    "Your results may vary"

  • #2
    self- bump
    Brewmaster, Minocqua Brewing Company
    tbriggs@minocquabrewingcompany.com
    "Your results may vary"

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    • #3
      The two systems I've worked with both had very shallow cone-bottoms with one central draw-off point. 20bbl. JV Northwest had 2" diameter draw, and 15bbl. Pub tun had a 1 1/2" draw. Of course neither had a raking system.

      For bigger tuns, the common wisdom is that you should have one draw-off per 1-1.5 square meters of flat-bottom surface area (e.g., from Kunze: "A run-off opening with a run-off cone is provided in every 1 m2"; from Briggs: "The wort collection tubes in the true base may be spaced 1 / 1.2-1.5m2").

      I would think 4 x 1" ports would be more than enough for a 20bbl. tun, providing the same collection "area" (4 x 0.5in.2 x 3.142 = 3.142in.2) as one 2" port (1in.2 x 3.142).
      Last edited by ZtheBrewer; 04-11-2015, 11:52 AM.

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