Clydesdale Imperial Stout
This beer took Silver at both the 2023 ACB competition and also the 2024 UK Nationals. It is a slight variant on an AG kit from Cross My Loof (Black Ops) – yeast changed (from 1 x SO-4 to 2 x Beoir) and I added 1ml Amyloglucosidase enzyme as the fermentation stuck a bit high. This led to a very low FG for such a big beer and a higher than expected ABV, but it has smoothed out nicely in the several months since bottling.
Recipe Details
| Batch Size |
Boil Time |
IBU |
SRM |
Est. OG |
Est. FG |
ABV |
| 23 L |
90 min |
82.3 |
41.728086545841 |
1.079 |
1.02 |
7.8 |
|
Actuals |
0 |
0 |
|
Style Details
| Name |
Cat. |
OG Range |
FG Range |
IBU |
SRM |
Carb |
ABV |
| Imperial Stout |
20 C |
1.075 - 1.115 |
1.018 - 1.03 |
50 - 90 |
30 - 40 |
0 - 0 |
0 - 0 % |
Fermentables
| Name |
Amount |
% |
| Pale Ale |
6.831 kg |
80.54 |
| Demerara Sugar |
502 g |
5.92 |
| Crystal Medium |
286 g |
3.37 |
| Crystal Dark |
286 g |
3.37 |
| Chocolate |
232 g |
2.74 |
| Black |
232 g |
2.74 |
| Roasted Barley |
113 g |
1.33 |
Hops
| Name |
Amount |
Time |
Use |
Form |
Alpha % |
| Summit |
35.5 g |
90 min |
Boil |
Pellet |
15.9 |
| Comet |
29.6 g |
60 min |
Boil |
Pellet |
8.6 |
| EK Goldings |
53.2 g |
0 min |
Boil |
Pellet |
6.8 |
Miscs
| Name |
Amount |
Time |
Use |
Type |
| CRS/AMS |
5.4 g |
0 min |
Mash |
Other |
| CRS/AMS |
7.6 g |
0 min |
Sparge |
Other |
| Yeast Nutrients |
2.9 g |
10 min |
Boil |
Other |
| Polyclar Brewbrite |
4.7 g |
10 min |
Boil |
Other |
| Irish Moss |
2.9 g |
10 min |
Boil |
Other |
Yeast
| Name |
Lab |
Attenuation |
Temperature |
| BEOIR |
|
74% |
0°C - 0°C |
Mash
| Step |
Temperature |
Time |
| Temperature |
67°C |
70 min |
| Mash Out |
75°C |
10 min |
Fermentation
| Step |
Time |
Temperature |
| Primary |
21 days |
20°C |
| Aging |
0 days |
0°C |
Notes
21.4L mash water.
Sparge to 25.5L boil volume
90 min boil to give 21L post-boil volume |