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Old 05-31-2011, 06:06 PM   #161
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Originally Posted by thughes View Post
I do 5 gallon batches BIAB no-sparge in my keggle (usually @8-9 gallons of water plus @ 12-14 lbs grain) and still have several gallons of head space.

Even with the head space, the thermal mass of all that grain and water in a 15 gal stainless keggle never loses more than 2 degrees over the course of a 90 minute mash (I just throw a blanket over the top because I have no lid). My converted cooler MLT loses more than that during a 60 minute mash.
Wow--that's impressive that your keggle retains the heat so well. With your keggle you would have enough headspace to make a bigger brew by a couple of gallons?

Also, I signed up for BIABrewer--thanks for the tip!


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Old 05-31-2011, 06:08 PM   #162
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Originally Posted by Mysticmead View Post
going with a 15 gallon pot will allow 5 gallon batches and if you heat a little additional water to "sparge" with, you can do 10 gallon batches with ease.
That might be a good option for those bigger brew days. To do this kind of sparging, I'd just have separate pot going with sparge water and transfer the grain bag into it after the mash, agitate, and let sit for a bit? Then drain it out and add the results back into the kettle?


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Old 05-31-2011, 11:16 PM   #163
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Originally Posted by blender747 View Post
That might be a good option for those bigger brew days. To do this kind of sparging, I'd just have separate pot going with sparge water and transfer the grain bag into it after the mash, agitate, and let sit for a bit? Then drain it out and add the results back into the kettle?
yep, that would be one way of doing it.. dunk sparging is a popular method with some BIAB brewers.. another option is to put the bag in a colander or on a cake rack over the keggle opening and slowly pour the water over the grains.
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Old 06-08-2011, 12:45 AM   #164
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Forgive me if this was already covered (a quick search of the thread didn't give me an answer)... If I have an aluminum basket, do I need to worry about conditioning the basket ahead of time by boiling it in some water for a half hour or so? I've heard that "unconditioned" aluminum can leech off-flavors into beer, but I wasn't sure whether this occurred at mash temperatures as well as boil temperature.
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Old 06-08-2011, 02:28 AM   #165
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Originally Posted by derpsperk View Post
Forgive me if this was already covered (a quick search of the thread didn't give me an answer)... If I have an aluminum basket, do I need to worry about conditioning the basket ahead of time by boiling it in some water for a half hour or so? I've heard that "unconditioned" aluminum can leech off-flavors into beer, but I wasn't sure whether this occurred at mash temperatures as well as boil temperature.
myth... don't worry about it
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Old 06-08-2011, 02:41 AM   #166
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myth... don't worry about it
Sweet, that's what I wanted to hear, thanks. But let's say I was hypothetically going to do a sour mash (kentucky common, berliner weisse, etc) in my aluminum BIAB vessel w/ unconditioned basket for 24 hrs or so. Would the extended contact time and increased acidity of the wort still be no problem?
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Old 06-09-2011, 11:17 PM   #167
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My wife has updated her blog and now has an order form for custom bags, makes the whole ordering thing a lot easier.

Check it out in my sig, we're selling a few bags a month depending on how we push it, but it's a small sideline nothing more serious, keeps her out of trouble while she's watching the kid

We'll update soon with more pics of some of the recent work.
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Old 06-09-2011, 11:34 PM   #168
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Originally Posted by derpsperk View Post
Sweet, that's what I wanted to hear, thanks. But let's say I was hypothetically going to do a sour mash (kentucky common, berliner weisse, etc) in my aluminum BIAB vessel w/ unconditioned basket for 24 hrs or so. Would the extended contact time and increased acidity of the wort still be no problem?
What would the ph be in that case? From what I've read in white papers, the oxidized layer of aluminum can withstand from 4.5 - 8.5ph. Any extremes will remove that layer and react with the aluminum.

The conditioning is a bit misleading. Having the aluminum exposed to O2 will "condition" it. Boiling in water or having it in the oven will grow the oxidized layer more, but there will always be an oxidized layer on the aluminum since it is always in contact with the air.
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Old 06-09-2011, 11:52 PM   #169
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What would the ph be in that case? From what I've read in white papers, the oxidized layer of aluminum can withstand from 4.5 - 8.5ph. Any extremes will remove that layer and react with the aluminum.

The conditioning is a bit misleading. Having the aluminum exposed to O2 will "condition" it. Boiling in water or having it in the oven will grow the oxidized layer more, but there will always be an oxidized layer on the aluminum since it is always in contact with the air.
It'll hardly drop too low, star san effectively kills stuff at 3.5, I'd say it's barely going below 5.
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Old 06-10-2011, 12:39 AM   #170
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From a little research, it looks like a sour mash is used to bring the mash ph down to 5.2. In that case, there's definitely no issue with aluminum.

But remember that aluminum does not like star san.


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