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whiskeyjack 01-04-2011 06:26 PM

10 Gallon Biab split into 2
Ive searched the forums and can't seem to find an answer to this question. I have a 15 gallon brew kettle, and it is big enough to do a full 10 gallon boil, but it's not big enough to do a full 10 gallon biab mash. So what I thought I could do was split it into two. Take half the grains, do my normal 5 gallon biab for 90 minutes, then put that wort into a bucket/extra kettle, then do another 5 gallon mash. Once that's complete add the original wort to the mix and do my normal 90 minute boil for the full 12+ gallons that I have. My question is, will this hurt/affect the original wort sitting in a brew pot for 90+ minutes not receiving heat ?

frogguruami 01-04-2011 06:40 PM

No answer for you but I am subbing because I was wondering the same thing earlier today!

gunner65 01-04-2011 07:07 PM

I cannot imagine there would be a problem. I would use the iodine method to make sure that the sugars are fully converted in both batches. Then take refracto readings for sanity. If pre-boil readings are real close you should be good to go.

mattd2 01-04-2011 07:16 PM

What BIAB method are you using? Filling the BK with the total water for the brew?
If you are you could try mashing with 1.25 - 1.5 qt/lb and then rinsing the grain once you remove the bag till you have your required volume.

ShakerD 01-04-2011 07:24 PM

I wondered this myself a few times.

I usually use ~7.5 gallons of water for 5 gallons of final wort. You wouldn't boil as much off so you wouldn't need 15g total water to end with 10g of wort.... right?

What if you figured out how much total water you needed and put it in the kettle, then mashed half the grain bill for 90 min. Reheated and mashed the other half in the same water for 90 min? I dunno just an idea.

I am curious as to what you end up doing and how it works out.

whiskeyjack 01-04-2011 10:25 PM

@gunner65 TY for the iodine test I will do that to make sure its good to go, but with a 60 minute mash @ 152ish and then raise temp to 168 for mash out for 20 minutes I should have pretty good conversion right ?

@Mattd2 I do the full amount of water with my biab, so I would do a 5 gallon batch with 8 gallons or so for my IPA's

whiskeyjack 01-04-2011 10:28 PM

@Gunner...So the original wort, it won't hurt it if it chills for like an hour and a half prior to bringing it to boil ?

mattd2 01-04-2011 10:51 PM


Originally Posted by whiskeyjack (Post 2523309)
@Mattd2 I do the full amount of water with my biab, so I would do a 5 gallon batch with 8 gallons or so for my IPA's

Yeah, so what I was talking about is more of a "traditional" method of mash then sparge so that you wouldn't need the full water and the grain to be in the pot all at once. Basically mash with the volume of water you would in the non-BIAB method, then lift the bag out and rinse with water until you hit your preboil volume. This is how I do it (but for only 3 gallon batches), so one thing that might be a pain is holding the bag while rinsing. But what I have just started to do is put the bag in another bucket after lifting it out of the pot (you could use your fermenter if you use buckets not carboys) and doing a batch sparge in there and giving it a good stir then dumping it into the pot. I did 2x sparges like this on my last batch. I read somewhere on here that the temperature of the sparge water is not all that critical for rinsing the grains out (if you want to get a good mash out to stop enzymes temp is critical).

gunner65 01-05-2011 12:23 AM


Originally Posted by whiskeyjack (Post 2523324)
@Gunner...So the original wort, it won't hurt it if it chills for like an hour and a half prior to bringing it to boil ?

I know of several posts where the mention of mashing and sparging one day then boiling the next. Maybe someone of more experience could chime in. I really cannot see how chilled wort that is re-heated could have issues. You could mash into a cooler or other insulated vessel which would probably keep the temp up over the next batch time.

As for full conversion I only mentioned iodine for sanity checking YMMV.

What you do need to do is report back here with how everything goes so others can learn. I know I am interested. Good luck!

wyzazz 01-05-2011 12:04 PM

I'd just make it a partial mash and pick up some DME.

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