58
APPENDIX SEVEN:
TYPICAL FERMENTATION
CHARTS & WHEN TO
COOL THE BEVERAGE
TYPICAL FERMENTATION CHARTS
Fermentation is a process by which yeast cells consume nutrients
and grow under anaerobic conditions and excrete carbon dioxide,
ethanol, flavours and other bi-products from their cells.
The way brewers typically measure the progress of a fermentation
is by measuring the specific gravity (density) of the wort or must.
A standard 4.64% beer typically starts at 1.0454 SG and
ferments down to 1.010. The difference in starting and finishing
SG is caused by both the reduction of dense nutrients in the
wort/must by the yeast (sugars and proteins) and the production
of ethanol which is less dense than water (water has an SG of
1.000).
Beers usually have some residual starch or dextrins in them which
the yeast cannot consume but beverages made from fruit (cider
and wine) or mead (made from honey) are made of simple sugars
and some non-flocculent yeast can ferment them right down.
Chart 1 shows typical reductions in SG for 4 ale yeast,
2 lager yeast, the wheat beer yeast and the cider yeast
used in WilliamsWarn Standard Kits.
S-04, Nottingham, US-05 and T-58 are ale yeast that ferment
warm (e.g. 23°C/73°F). Ale yeast ferment faster than lager yeast
in general but also due to the warmer temperatures used.
Nottingham ale yeast will be finished fermenting close to Day 3
and we give an extra day warm maturation to be sure. Nottingham
will produce a 4.47% alcohol by volume beer when fermenting
from 1.0454 to 1.011. Nottingham can produce higher alcohol
beers when more DME or sugars are added in the mix.
S-04 yeast will ferment fast and settle out quickly. It will
ferment from 1.0454 to about 1.011 making a 4.47% alcohol
by volume beer.
US-05 ale yeast is a slow starter and will only ferment from
1.0454 to about 1.041 on the first day. However it then kicks
in and will likely be finished by Day 3 at about 1.011, making a
4.47% alcohol by volume beer.
T-58 ale yeast is used for Belgian Ales and wheat beers and
will ferment quickly and then have a slow end where it takes a
few days to finish. It will produce a 4.47% alcohol beer when
fermenting from 1.0454 to 1.011. It also can produce high
alcohol beers when more DME or dextrose (glucose) is added at
the start.
S-23 and W34/70 are lager yeasts which are fermented at
colder temperatures compared to the ales. Lager yeast tend to
grow more slowly than ales in general so therefore take a little
longer to get going. The total fermentation time is longer by two
days but should be finished by Day 6 as shown in the chart.
They will finish at about 1.009 when used in a WilliamsWarn
Standard Kit and therefore produce 4.77% ABV lagers/pilsners
with an initial SG of 1.0454.
It is important to note that a “diacetyl rest” at a warm
temperature is recommended during fermentation for lager
yeast to achieve the 6 day target. Please see more details below
regarding this (see Chart 3).
Specific Gravity reduction from 1.040 SG during
Fermentation 3 Ale and 2 Lager Yeast
0.995
1.000
1.005
1.010
1.015
1.020
1.025
1.030
1.035
1.040
1.045
0
1
2
3
4
5
6
7
8
9
SG
DAY
Nottingham
S-04
W34/70
WB-06
US-05
S-23
T-58
Cider
CHART 1
Specific Gravity Reduction from 1.045 SG
During Fermentation – 4 Ale, 2 Lager,
1 Wheat Beer & 1 Cider Yeast
Содержание BrewMaster
Страница 3: ...PART ONE YOUR PERSONAL BREWERY...
Страница 14: ...PART TWO MAKING YOUR BEVERAGE WITH THE STANDARD BREWING METHOD...
Страница 39: ...PART THREE MAKING BEVERAGES WITH THE ADVANCED METHOD...
Страница 45: ...PART FOUR APPENDICES...
Страница 78: ...TROUBLE SHOOTING THE WILLIAMSWARN PERSONAL BREWERY...