I want to brew a double 40 litre batch tommorrow but need to hold back some 10 litres of water(liquor) as my boiler is 70 litres and the mash size would be 69 litres ,so almost brim full.
my question is what is best
1 add the 10 litres held back at removal of bag ie boil time
2 add 10 litres into fermenter helping cool wort down
i am using the calculator from australian biab site so all calculations are done for me with regard to gravities at various points in the process
thanks in advance Paul
maxi biab
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jaberry
Re: maxi biab
Have you looked at the biabrewer maxi-BIAB guide? This says to add held back sparge water just before boil (as much as you can) then the remainder towards end of boil. Then of course calculate any dilution needed and add to FV
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RdeV
Re: maxi biab
Sounds like it would be a fairly straight forward scaling of MaxiBIAB. So at point 1, after mashing and then lifting out the bag, dunk it in a bucket with the remaining water that didn't fit in the mash, make sure it is just off the boil and stir thoroughly. Lift that after 10 minutes and drain, add the sparge liquor to the boil as you can, no later than 15 minutes from the boil end though. That's to sanitise it, you can prebent any interruption to the boil by pre-boiling the sparge, small quantities I just microwave!
After the boil and cooling, dilute to the desired gravity in the fermenter.
BTW, there's a flaw in the guide's dilution calculation, use this:
Diluted Volume = Actual SG ÷ Target SG × Actual Volume
So for the purposes of illustration, you might end up with 70L of 1.060 and the target OG is 1.050, so it goes:
60 ÷ 50 × 70 = 84
I.e. dilute to 84L, do that by adding 14L of plain water.
HTH!
After the boil and cooling, dilute to the desired gravity in the fermenter.
BTW, there's a flaw in the guide's dilution calculation, use this:
Diluted Volume = Actual SG ÷ Target SG × Actual Volume
So for the purposes of illustration, you might end up with 70L of 1.060 and the target OG is 1.050, so it goes:
60 ÷ 50 × 70 = 84
I.e. dilute to 84L, do that by adding 14L of plain water.
HTH!
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paulg
Re: maxi biab
well I brewed last week using the aussie web site biabacus holding back 20 litres of liquor until after the mash was complete and then adding after removing the bag.i did not sparge at all but did get good efficiency anyway.
My only query was my water treatment salts .
I added the salts calculated on brew length all together even though I was 20 litres short during the mash,the ph was about right and sg/og figures were as expected given the accuracy of refractometer/hydrometers we use.
I actually ended up with slightly more wort at the same gravity as I wanted due to my losses in boiler being less than expected
thanks for your help
Paul
My only query was my water treatment salts .
I added the salts calculated on brew length all together even though I was 20 litres short during the mash,the ph was about right and sg/og figures were as expected given the accuracy of refractometer/hydrometers we use.
I actually ended up with slightly more wort at the same gravity as I wanted due to my losses in boiler being less than expected
thanks for your help
Paul