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Old 08-06-2014, 01:50 PM   #11
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I raise temp carefully and stir with no false bottom. When teaching you will hopefully have plenty of volunteers for the stirring. It takes me around 20mins to go from mash temps to mash out temps. I BIAB too and do the mash out for the exact reasons you mention. Generally I'm in the 75%-80% efficiency range.

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Old 08-06-2014, 07:06 PM   #12
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I don't do a mash-out, but I usually "fly sparge" with about a gallon of warm (sometimes even cold) water then add the rest of pre-boil water to the kettle. My efficiency is good... Am I missing something? Am I risking tannin extraction?
As for heating up the mash (I've maybe done this twice) I just lift the bag as I fire the burner.


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Old 08-06-2014, 11:51 PM   #13
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Quote:
Originally Posted by lebucheron View Post
I don't do a mash-out, but I usually "fly sparge" with about a gallon of warm (sometimes even cold) water then add the rest of pre-boil water to the kettle. My efficiency is good... Am I missing something? Am I risking tannin extraction?
As for heating up the mash (I've maybe done this twice) I just lift the bag as I fire the burner.


Don't fake the funk on a nasty dunk!
- Bubs from homestarrunner.com
I've done a few "pour-over sparges" to wash a little more of the sugars out of that grain bag. Back when I only had a 10 gallon BK, it was sometimes necessary for me to hold back a couple gallons just to make the grain + water fit. I found it gave a few more percentage points, but now that I use a keggle, I don't do the sparge anymore. I just hoist out the bag and fire up the burner, allowing the bag to drip while the kettle is on its way to a boil. As for tannins, I wouldn't worry unless you heat the mash above 170 or so.
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Old 08-18-2014, 12:13 AM   #14
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Just wanted to thank all of you who contributed. I did my first BIAB today (with a few folks from my HB club over to see how it went). I didn't want to change my mill settings, so I kept it at .032, and double-milled. Lots of flour! The mash volume with the grain was 9 gallons in my 10 gallon pot, so maxed out, but after mashing and giving the bag a twist (I skipped the pulley for now) I got my pre-boil volume, and with a 14 pound grain bill, got 75% conversion/lautering efficiency. The same recipe with the same grain bill on my 3-vessel system came out with 10% higher conversion/lautering, even accounting for equipment losses. But BIAB definitely was faster, since I didn't have to recirculate and fly sparge. And WAY easier clean-up!!! It was pretty nice!

The answer I came up with for my concern about scorching was to go easy on the heat, and stir constantly. I saw BIABers talking about a paint stirrer, and I was sure it wasn't the drill operated kind, so when I looked into it found they were referencing a hand mixer that reminded me of a potato masher. I just went to Cash & Carry and got a 24" potato masher for 10 bucks.

Thanks again for all the help!

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Old 08-19-2014, 04:39 AM   #15
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Another option is to use a cheapo round baking rack on the bottom underneath your bag, then fish it out before boiling. Here's an example:

http://www.amazon.com/Andersons-Baking-Cooling-Round-4-Inch/dp/B000HM9TGM/ref=sr_1_20?ie=UTF8&qid=1408423076&sr=8-20&keywords=baking+rack

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Old 08-19-2014, 05:36 AM   #16
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I have a 15 gallon keggle for doin my first BIAB next week. The bag I have (from brewinabag.com) will be clipped to the rim so that it allows enough space between the bottom of the keg and the bottom of the bag (approx 3-4 inches) so that I foresee no scorching should occur. With it being suspended like that (if I have explained a good enough mental picture for you all) does anybody see a potential issue with mashing in 14.38 pound grain bill? Do you think my clips be sufficient enough to hold it in place while mashing and stirring? ImageUploadedByHome Brew1408426080.453732.jpg. I also want to hit my preboil volume with no sparging any thoughts on how much initial strike water I should use with that amount of grain?ImageUploadedByHome Brew1408426507.013915.jpg
Here's the recipe iwill be using if that helps with providing any feedback.

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Old 08-19-2014, 01:28 PM   #17
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Quote:
Originally Posted by copper2hopper View Post
I have a 15 gallon keggle for doin my first BIAB next week. The bag I have (from brewinabag.com) will be clipped to the rim so that it allows enough space between the bottom of the keg and the bottom of the bag (approx 3-4 inches) so that I foresee no scorching should occur. With it being suspended like that (if I have explained a good enough mental picture for you all) does anybody see a potential issue with mashing in 14.38 pound grain bill? Do you think my clips be sufficient enough to hold it in place while mashing and stirring? Attachment 218691. I also want to hit my preboil volume with no sparging any thoughts on how much initial strike water I should use with that amount of grain?Attachment 218692
Here's the recipe iwill be using if that helps with providing any feedback.
Since the water will already be in the kettle when you add the grain, the weight on the bag will be minimal, but I'm not sure how it will hold up to stirring. Stir carefully and don't puch down on the bottom, I guess! But as far as volumes go, you're fine. I use BeerSmith to calculate my volumes, taking into account grain absorption and a 1 gallon per hour boil-off, I needed 8 gallons of water for 14 pounds of grain, which worked fine in my 10 gallon pot. Tight, but manageable.
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Old 08-20-2014, 02:27 PM   #18
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Quote:
Originally Posted by copper2hopper View Post
The bag will be clipped to the rim so that it allows enough space between the bottom of the keg and the bottom of the bag (approx 3-4 inches) so that I foresee no scorching should occur. With it being suspended like that (if I have explained a good enough mental picture for you all) does anybody see a potential issue with mashing in 14.38 pound grain bill? Do you think my clips be sufficient enough to hold it in place while mashing and stirring? .

Just my opinion, but I don't care for this method, as there will be a large percentage of strike water outside the grain bag.

I prefer to have the bag line the entire kettle, and ideally not fire the burner with the bag in the pot but just insulate the kettle during the mash.

If you need to add heat, just heat gently and STIR with the bag in the pot.

Just my 2 cents.



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