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Old 02-16-2012, 01:50 AM   #1
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Default 15 gal poly MLT project - False Bottom?

I am buying a 15 gallon poly water container to use as an MLT. I will be cutting the top off and fashioning a removable top.

I am wondering how to install a false bottom with this setup, being that there is no concave bottom or ridge to install against. thx

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Old 02-16-2012, 02:27 AM   #2
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Originally Posted by cbird01 View Post
I am buying a 15 gallon poly water container to use as an MLT. I will be cutting the top off and fashioning a removable top.

I am wondering how to install a false bottom with this setup, being that there is no concave bottom or ridge to install against. thx
Jaybird makes false bottoms for coolers that come with a stand because of that reason. You should measure your inside diameter and go shopping at http://www.norcalbrewingsolutions.com/. Think he's also still offering free shipping but not positive.
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Old 02-16-2012, 02:32 AM   #3
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If the bottom of that vessel is flat, you could use a domed FB...

Cheers!

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Old 02-16-2012, 02:57 AM   #4
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ok, so then it is cut to order. Makes sense

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Old 02-16-2012, 03:06 AM   #5
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Wow, pretty pricey. What's my other options? Can I do a manifold, without creating channeling?

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Old 02-16-2012, 01:30 PM   #6
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i like that container. manifold is your most economical solution. make one that is big enough, and channeling shouldn't be too much of an issue

and what is your plan for insulation or maintaining heat? recirc/electric?

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Old 02-16-2012, 01:52 PM   #7
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You could use a mash screen like this one:

http://www.homebrewtalk.com/f51/55-gal-drum-mash-tun-false-bottom-ideas-138941/#post1575665
Several good ideas in that thread.



In my 50 gallon system I use a loop of silicone tubing connected with a piece of 1/2" OD stainless tube to hold up a stainless false bottom I made.

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Old 02-16-2012, 02:37 PM   #8
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i like that container. manifold is your most economical solution. make one that is big enough, and channeling shouldn't be too much of an issue

and what is your plan for insulation or maintaining heat? recirc/electric?
I am an insulation guy, so I have materials available. I plan to use polyurethane spray foam insulation. We have 200 bd ft kits, which are for contractor use and much better application than the can stuff(which doesn't really apply well to a large flat surface area). I plan to add 1 inch, which will give me an R-5. I am going to test it and see if that is satisfactory.

I may add a layer of reflectix over that if needed. The thing I see people miss is that Reflectix has a very small R-value. The air space in the bubbles is actually only R-1.1(from conduction). The only way you get a value from it is if you are somehow stopping RADIANT heat transfer. In order to stop radiant heat transfer (which is heat transfer across an air space), you MUST have an air space. It barely helps if you wrap a MLT in Reflectix without an air gap. That air gap must also be air tight. So, I will install 1/2in furring strips around the foamed MLT, then a layer of reflectix. This will then be reflecting the radiant heat transfer from the heated up foam back to the MLT. The key is that air gap must be air tight, or Convection will ruin the whole gain by the Reflectix application. So, I will be sure to tape the seams well and have a space at the top, which is uninsulated so the tape can adhere.
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Old 02-17-2012, 07:12 PM   #9
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In my 50 gallon system I use a loop of silicone to hold up a stainless false bottom I made.
What do you mean by a loop of silicone, you mean high temp silicone tubing, or silicone caulk? How much room do you need under the false bottom?

Where is a good source for the material to use for this. Also, how do you cut the circle with significant accuracy to prevent grains bypassing?
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Old 02-17-2012, 08:04 PM   #10
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I use a loop of 1/2" x 3/4" silicone tubing we sell under the false bottom to act as the seal.
A short piece of stainless steel tubing connects the two ends.

The false bottom is not tight against the side.


I don't direct fire the vessel so the silicone tubing works well to keep the grain from getting under the false bottom.

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