All
I'm planning on brewing my first BIG BATCH at the weekend which will hopefully leave me with 70L of 1.042 beer.
I wondered if anyone has the time would they check my math for calculating required volume in the boiler pre boil?
First, some information about my system and it's losses and the ingredients that I'll be using:
Batch Size 70L
%ge lost to boil 15% - this has been all over the place from 16% to 28% over 90 mins â so going with a 60min boil and calculating 15%
Weight of hops to be used 240g
Expected loss to hops = ~1.5L (based on 240 x 0.006L)
Boiler dead space = 3L
I calculate that I will need a pre boil volume of ~88L
I calculated this by adding together required volume in FV, loss to boiler and loss to hops, so 70L + 3L + 1.5L = 74.5L then dividing this by 85 (which is the %ge amount I wont loose to the boil) then multiplying by 100 .. giving 87.6L
Is that right?
Also â I am certain that I will not collect 88L before the gravity of the runnings from the mash hit 1.008 so I expect that I will have to top the boiler up to 88L with tap water â which I will treat with campden tablet. - Is this a practice that other people do?
Cheers!
I'm planning on brewing my first BIG BATCH at the weekend which will hopefully leave me with 70L of 1.042 beer.
I wondered if anyone has the time would they check my math for calculating required volume in the boiler pre boil?
First, some information about my system and it's losses and the ingredients that I'll be using:
Batch Size 70L
%ge lost to boil 15% - this has been all over the place from 16% to 28% over 90 mins â so going with a 60min boil and calculating 15%
Weight of hops to be used 240g
Expected loss to hops = ~1.5L (based on 240 x 0.006L)
Boiler dead space = 3L
I calculate that I will need a pre boil volume of ~88L
I calculated this by adding together required volume in FV, loss to boiler and loss to hops, so 70L + 3L + 1.5L = 74.5L then dividing this by 85 (which is the %ge amount I wont loose to the boil) then multiplying by 100 .. giving 87.6L
Is that right?
Also â I am certain that I will not collect 88L before the gravity of the runnings from the mash hit 1.008 so I expect that I will have to top the boiler up to 88L with tap water â which I will treat with campden tablet. - Is this a practice that other people do?
Cheers!