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Old 10-08-2012, 03:57 PM   #1
Jackjama
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Default Do i need a false bottom in biab pot

I am putting together a 60 qt pot to do biab. As i was researching it, i remember noting i needed a false bottom to protect my bag. However i can't find that now.
Can someone cofirm this?

I saw somewhere where somebody used a perferated pizza pan with ss bolts as legs to act as a false bottom. Any other ideas?


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Old 10-08-2012, 04:12 PM   #2
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Default General Recommendations

There is a general recommendation that you have something in your kettle to keep the BIAB bag off of the bottom of the kettle. Many members use a basket that goes with their steamer kettle and put the bag in the steamer basket. This is enough to keep their bags off the bottom of the kettle. A false bottom would also work. Even something like a pizza pan with holes drilled in it and maybe some small stainless bolts to lift the pizza pan from the bottom of the kettle would work (I am thinking of this to avoid the expense of purchasing a separate false bottom if you don't need to). EDIT: Sorry, I did not read through your entire post. But you get the idea.

Anything that might create a little space.

I hope that this helps.

Mark


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Old 10-08-2012, 04:16 PM   #3
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It is advisable to have something on the bottom of the pot if you are going to fire the burner. Two ways around this are:

1. Don't fire the burner w/ the bag in the pot
2. slightly lift and suspend the bag while firing the burner

IMO, BIAB can easily and successfully be done without adding heat during the mash and also skipping a mashout, therefore nothing is needed in the bottom of the kettle IMO.
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Old 10-08-2012, 04:20 PM   #4
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When doing BIAB and I apply heat, I pull the bag up a bit, so it doesn't touch the bottom.
I don't lift it out all the way, just pull it up several inches. Plus I stir, since the grain is a good insulator and I don't want pockets of very hot water, that could denature enzymes.

If you have a false bottom, I think you still must be careful and constantly stir when the heat is on, and for some time after, as how water will be stuck on the bottom and want to rise, but be blocked by the grain bag.

Maybe something like:
http://www.amazon.com/Excellante-Nic...s=steamer+rack

Except this may not be safe, a sit's from China, and not SS.


I've read a number of BIAB brewers who mention the benefit of a mash out. I have not experimented, so I can't offer an opinion. But I would not assume it offers no benefit without some experiments to compare results.

I also think sparging (thus mashing less thin) and SCOOBing have a noticable impact on efficiency.
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Old 10-08-2012, 07:03 PM   #5
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Thanks everyone. I have a little bit better understanding. Bottom line: Do not let the bag sit on the bottom of the pan if you fire up the burner.

I think i will go with the pizza pan approach.
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Old 11-02-2012, 02:07 AM   #6
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Be careful. I purchased and used this exact same thing. Rusted after only a few sessions. Don't want that in my wort anymore.

http://www.amazon.com/Excellante-Nic...s=steamer+rack

Looking for a good stainless (i.e. rust-proof) version if anyone has a good suggestion.
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Old 11-02-2012, 04:11 AM   #7
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I just use a metal collapsible steamer basket in the bottom. Works perfectly, $8.
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Old 11-02-2012, 05:16 AM   #8
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I use a strainer basket with full volume (no sparge). Stirring frequently and adding short bursts of heat as needed, I found a 10 second burst will raise the temp 3 or 4 deg F.
I mash out at 168F and use insulated rubber gloves to squeeze as much as possible.
Take a SG reading after gathering the runnings, and then another one after the boil. My efficiency is right at 80%.
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Old 11-02-2012, 12:33 PM   #9
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My first 2 BIAB batches I had no need to fire the kettle as the summer heat maintained temp just fine. As fall approaches I have found a need to both fire the kettle and insulate it after doughing in. I created a few scorch marks on the voile bag on my last batch, but that was because I put the bag in as I was heating the strike water. I have purchased and plan on using a collapsible vegetable steamer in the future, to keep the bag from becoming trapped between the bottom of the dip tube and the bottom of the kettle.
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Old 11-02-2012, 11:53 PM   #10
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in summary i guess, best to use no heat w/ a bag in the pot or raise it off the bottom of the pot...and if you apply heat, as with many things in brewing, a little patience and a low flame is all you might need.


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