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28-05-2021, 07:26
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Having access to every single page of Heineken's wartime brewing records means I can do all sorts of fun stuff. Like trawling through them recording every gyle: beer, batch size and OG.This give me access to all sorts of interesting and useful data. Like exactly how much of each beer they brewed in a year. Getting hold of that information was my main motivation. But I also get to see how much beer they brewed month-by-month and its average OG.
I'm dead glad that I did. It's revealed some unexpected insights. The first being how much the quantity they brewed varied from month to month. In November they brewed over 35,000 hl, but in August fewer than 11,000 hl. That's a huge difference. Far larger variation than I've ever seen at a UK brewery. And a very different pattern
At Whitbread, the summer was the peak brewing season, with the greatest amount brewed in July, followed by August. It was the exact opposite at Heineken, with those two months being the slackest. I know why Whitbread brewed more in the summer - people drank more beer during warmer weather. But why would Heineken brew less then? Could it be because, if they were lagering for any length of time, beer had to be brewed months in advance?
Second surprise was the average OG. 11.2ยบ Plato is 1044.86 in SG.Not a huge amount greater than the UK average of 1041.02 (1937). I would have expected a continental brewery's average to be quite a bit higher than the UK's.
Heineken (Rotterdam) output and average OG by month
month
year
hl
grav. Points
average OG
Jan
1939
33,594
383,843.9
11.4
Feb
1939
30,712
350,098.1
11.4
Mar
1939
21,793
237,043.0
10.9
Apr
1939
21,178
232,720.9
11.0
May
1939
21,015
230,321.8
11.0
Jun
1939
29,354
329,148.0
11.2
Jul
1939
12,968
138,059.7
10.6
Aug
1939
10,887
129,107.3
11.9
Sep
1939
26,980
301,120.3
11.2
Oct
1939
34,986
395,410.6
11.3
Nov
1939
35,207
393,956.5
11.2
Dec
1939
20,379
232,225.5
11.4
Total
299,053
3,353,056
11.2
Source:
Heineken brewing records held at the Amsterdamse Stadsarchief, documents number 834 - 1758 and 834 - 1759.
Whitbread Ale output by month
month
year
barrels
Jan
1939
29,574
Feb
1939
30,114
Mar
1939
35,865
Apr
1939
39,817
May
1939
36,053
Jun
1939
42,091
Jul
1939
44,130
Aug
1939
40,878
Sep
1939
37,476
Oct
1939
33,246
Nov
1939
35,365
Dec
1939
39,100
Total
1939
443,709
Source:
Whitbread brewing record held at the London Metropolitan Archives, document number LMA/4453/D/01/103.
Heineken (Rotterdam) output by beer in 1939
Beer
OG
hl
%
Bok
17.2
1,713
0.57%
Mei
15.2
2,163
0.72%
Bei
12.5
4,435
1.48%
Do
8.9
26,429
8.84%
Li
8.9
41,036
13.72%
P Exp
11.8
43,004
14.38%
P
11.8
180,273
60.28%
total
299,053
Sources:
Heineken brewing records held at the Amsterdamse Stadsarchief, documents number 834 - 1758 and 834 - 1759.
More... (http://barclayperkins.blogspot.com/2021/05/heineken-rotterdam-output-in-1939.html)
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Having access to every single page of Heineken's wartime brewing records means I can do all sorts of fun stuff. Like trawling through them recording every gyle: beer, batch size and OG.This give me access to all sorts of interesting and useful data. Like exactly how much of each beer they brewed in a year. Getting hold of that information was my main motivation. But I also get to see how much beer they brewed month-by-month and its average OG.
I'm dead glad that I did. It's revealed some unexpected insights. The first being how much the quantity they brewed varied from month to month. In November they brewed over 35,000 hl, but in August fewer than 11,000 hl. That's a huge difference. Far larger variation than I've ever seen at a UK brewery. And a very different pattern
At Whitbread, the summer was the peak brewing season, with the greatest amount brewed in July, followed by August. It was the exact opposite at Heineken, with those two months being the slackest. I know why Whitbread brewed more in the summer - people drank more beer during warmer weather. But why would Heineken brew less then? Could it be because, if they were lagering for any length of time, beer had to be brewed months in advance?
Second surprise was the average OG. 11.2ยบ Plato is 1044.86 in SG.Not a huge amount greater than the UK average of 1041.02 (1937). I would have expected a continental brewery's average to be quite a bit higher than the UK's.
Heineken (Rotterdam) output and average OG by month
month
year
hl
grav. Points
average OG
Jan
1939
33,594
383,843.9
11.4
Feb
1939
30,712
350,098.1
11.4
Mar
1939
21,793
237,043.0
10.9
Apr
1939
21,178
232,720.9
11.0
May
1939
21,015
230,321.8
11.0
Jun
1939
29,354
329,148.0
11.2
Jul
1939
12,968
138,059.7
10.6
Aug
1939
10,887
129,107.3
11.9
Sep
1939
26,980
301,120.3
11.2
Oct
1939
34,986
395,410.6
11.3
Nov
1939
35,207
393,956.5
11.2
Dec
1939
20,379
232,225.5
11.4
Total
299,053
3,353,056
11.2
Source:
Heineken brewing records held at the Amsterdamse Stadsarchief, documents number 834 - 1758 and 834 - 1759.
Whitbread Ale output by month
month
year
barrels
Jan
1939
29,574
Feb
1939
30,114
Mar
1939
35,865
Apr
1939
39,817
May
1939
36,053
Jun
1939
42,091
Jul
1939
44,130
Aug
1939
40,878
Sep
1939
37,476
Oct
1939
33,246
Nov
1939
35,365
Dec
1939
39,100
Total
1939
443,709
Source:
Whitbread brewing record held at the London Metropolitan Archives, document number LMA/4453/D/01/103.
Heineken (Rotterdam) output by beer in 1939
Beer
OG
hl
%
Bok
17.2
1,713
0.57%
Mei
15.2
2,163
0.72%
Bei
12.5
4,435
1.48%
Do
8.9
26,429
8.84%
Li
8.9
41,036
13.72%
P Exp
11.8
43,004
14.38%
P
11.8
180,273
60.28%
total
299,053
Sources:
Heineken brewing records held at the Amsterdamse Stadsarchief, documents number 834 - 1758 and 834 - 1759.
More... (http://barclayperkins.blogspot.com/2021/05/heineken-rotterdam-output-in-1939.html)