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Home Brew Forums > Home Brewing Beer > DIY Projects > Kettles, Mash Tuns, & Hot Liquor Tanks > 15 gal poly MLT project - False Bottom?
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Old 02-20-2012, 05:07 AM   #11
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Default 15 gal Poly Insulated MLT project

Like the silicone idea. Thanks

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Old 02-20-2012, 05:41 AM   #12
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Originally Posted by BargainFittings View Post
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.
Do you just use the pressure of the grain bed compaction to push down against the silicone to prevent grain blow by or some other method?

How about using a dome false bottom - http://www.homebrewstuff.com/12-domed-false-bottom.html to sit flat on the bottom? I only find 12 inch and I have a 15 inch diameter, but it seems like it would not matter since it is sitting on bottom anyway.
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Old 02-20-2012, 06:59 AM   #13
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Is this Craig in Tucson? If so, I have some leftover perforated SS from making my FB. It's ~16" by 20", and you're welcome to have it if you decide to use the silicone tubing method. The holes are spaced a little further apart than ideal IMO, but I haven't had any issues with drain speed or stuck sparges. Here's what mine looks like-



I also have an extra 50' roll of 1/2" ID silicone if you need some.

I would think a 12" domed FB would work fine too. I've seen them used in larger vessels without issue before.

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Old 02-20-2012, 02:19 PM   #14
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Dang...wish I was Craig in Tucson!

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Old 02-20-2012, 03:14 PM   #16
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awesome, thanks ross. I think I might take you up on that. what do you all suggest as a dip tube assembly? I am not too keen on the silicon tubing to the bulkhead method.

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Old 02-20-2012, 08:07 PM   #17
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No problem, and this is Jason, not Ross. It's in my shop up at my parents house, but I'll grab it next time I'm up there, and we can meet up more central sometime.

As far as diptubes, I don't have any since I bottom drain, but I made a copper diptube for a fellow homebrewer, and he seems happy with it. It's essentially the same design as Jaybirds, but made of copper instead of SS, and with a small shoulder that holds the FB down. It was pretty cheap and easy to make.

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Old 02-20-2012, 11:54 PM   #18
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Jason! That is funny, I have been talking to another brew bud in Tucson and never knew what his screen name was and thought it was him...Excellent, thanks Jason, I will get in touch. It will really help the project. Can you PM your phone? Talk to you soon.

Wow dude! You have a lot of posts for a three year stint!

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Old 02-21-2012, 01:56 AM   #19
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50 feet of silicone and an extra 16 inch piece of stainless perf...what the heck did you build?!

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Old 02-21-2012, 02:18 AM   #20
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50 feet of silicone and an extra 16 inch piece of stainless perf...what the heck did you build?!
Ha! Just a ghetto 3 keggle HERMS. The perf SS I got from the scrap pile at a local metal yard. I think I paid either $5 or $10 plus a sixer of homebrew for a pretty large piece. The silicone is a long story.
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