missed o.g by ten points

[sorefingers23]

i just finished brewing a batch of reapers mild, the og was supposed to be 1.035 and i ended up with 1.045 can some one tell me what might of happened

i hit my pre, and post boil water volumes so its not a case of to little water.

 

[Hello]

Is this an extract batch? Did you use top off water then take your gravity reading?

 

[doug293cz]

If it was an all grain brew, then you overachieved on your efficiency compared to what the recipe assumed. What was your process? Grain weight, strike volume and sparge volume(s)?

Brew on

 

[sorefingers23]

All grain, 6lbs marris otter, 1 lb crystal 60, 0.44lbs chocolate malt

Mashed in with 9.5 litres, sparged with 20.5 litres



Sent from my iPhone using Home Brew

 

[soccerdad]

what was the wort temp when you read the gravity?

 

[sorefingers23]

Temp was 21c but I adjusted in beersmith


Sent from my iPhone using Home Brew

 

[doug293cz]

All grain, 6lbs marris otter, 1 lb crystal 60, 0.44lbs chocolate malt

Mashed in with 9.5 litres, sparged with 20.5 litres



Sent from my iPhone using Home Brew

Batch or fly sparge?

Brew on

 

[Hello]

It sounds like you achieved super high efficiency. What was the efficiency you had in beer smith?

 

[pricelessbrewing]

Could be a couple things.

First, smaller grain bills tend to have higher mash efficiencies due to the higher water to grain ratio.

Second, could be issues with your general mash or Brewhouse efficiency being higher than the system in the recipe.

Third your volumes could slightly less, how did you measure your volume and what temp was it at?

Fourth, hydrometer temp corrections are rather inaccurate. It's much better to just let it cool off and then test it.

 

[sorefingers23]

Batch or fly sparge?



Brew on

Batch spare

 

[sorefingers23]

It sounds like you achieved super high efficiency. What was the efficiency you had in beer smith?

Efficiency was 82 I was going for 72, would an efficiency difference of 10 make a 10 point difference in o.g.

 

[Jthornburgh]

I had the exact same thing happen in the batch I brewed yesterday.

 

[doug293cz]

What were your pre-boil and post boil volumes?

Brew on

 

[sorefingers23]

Per boil was 25.5 l and post was around 21l

 

[doug293cz]

I can't get your numbers to be self consistent. In order to get an OG of 1.045 in 21 L (5.55 gal) with 7.44 lbs of grain, I have to force a mash efficiency of 94.4%, with a conversion efficiency of 108.5%, and a lauter efficiency of 87%.

How did you determine your 82% efficiency, and can you show us all the inputs you provided to the calculations (including software defaults used)?

Brew on

 

[pricelessbrewing]

Per boil was 25.5 l and post was around 21l

How were these numbers measured accurately? At what temp were the volumes recorded (post mash, before boiling, at boil, or after chilling)

 

[brewcat]

How long did you mash? And what temp?

 

[sorefingers23]

I can't get your numbers to be self consistent. In order to get an OG of 1.045 in 21 L (5.55 gal) with 7.44 lbs of grain, I have to force a mash efficiency of 94.4%, with a conversion efficiency of 108.5%, and a lauter efficiency of 87%.

How did you determine your 82% efficiency, and can you show us all the inputs you provided to the calculations (including software defaults used)?

Brew on

I got the 82% by inputting og plus how many litres into fermenter into beersmith

Normally when I brew(I've brewed around 60 batches) I hit or come close to all targets.


Sent from my iPhone using Home Brew

 

[sorefingers23]

How were these numbers measured accurately? At what temp were the volumes recorded (post mash, before boiling, at boil, or after chilling)

All volumes were measured using my sight glasses which I marked off one liter at time.

I measured pre and post boil when the wort was still quite hot and made the adjustments in beer smith, and then checked og again after cooling just to be sure


Sent from my iPhone using Home Brew

 

[sorefingers23]

How long did you mash? And what temp?

Mashed for 60 mins @ 67c


Sent from my iPhone using Home Brew

 

[Aristotelian]

I can't get your numbers to be self consistent. In order to get an OG of 1.045 in 21 L (5.55 gal) with 7.44 lbs of grain, I have to force a mash efficiency of 94.4%, with a conversion efficiency of 108.5%, and a lauter efficiency of 87%.

How did you determine your 82% efficiency, and can you show us all the inputs you provided to the calculations (including software defaults used)?

Brew on

I get 82% putting his numbers into Brewgr. That number looks correct to me.

http://brewgr.com/recipe/15641/test-recipe?public=true

Efficiency was 82 I was going for 72, would an efficiency difference of 10 make a 10 point difference in o.g.

If i reduce his efficiency to 72%, the OG only goes down to 1040. So, no, efficiency is not the only thing causing higher OG. The recipe must be off. Question is, how did you come up with 1032 as the target for the recipe?

 

[sorefingers23]

I got 1.035 as the target for the recipe from beersmith. It also falls into the guide lines for an English mild ale


Sent from my iPhone using Home Brew

 

[doug293cz]

I still can't get the numbers to work. Can you double check that you gave us the correct grain bill above?

Brew on

 

[doug293cz]

I get 82% putting his numbers into Brewgr. That number looks correct to me.

http://brewgr.com/recipe/15641/test-recipe?public=true



If i reduce his efficiency to 72%, the OG only goes down to 1040. So, no, efficiency is not the only thing causing higher OG. The recipe must be off. Question is, how did you come up with 1032 as the target for the recipe?

Your link goes all 404 on me.

Edit: Brewgr might be having problems this am. Tried the link in another browser and got "500 Server Error"
Brew on

 

[Aristotelian]

Your link goes all 404 on me.

Edit: Brewgr might be having problems this am. Tried the link in another browser and got "500 Server Error"
Brew on

My bad. Brewgr would not let the recipe go public until I added yeast. Should work now.

 

[doug293cz]

My bad. Brewgr would not let the recipe go public until I added yeast. Should work now.

According to the Brewgr recipe page, the "Batch Size" input is supposed to be the full post-boil volume prior to any transfer (trub) losses, and the "Boil Size" is the pre-boil volume. So, these values should have been input as 21 L and 25.5 L respectively. When I do that, the required efficiency to get a 1.045 OG is 90%.



Brew on

 

[Aristotelian]

According to the Brewgr recipe page, the "Batch Size" input is supposed to be the full post-boil volume prior to any transfer (trub) losses, and the "Boil Size" is the pre-boil volume. So, these values should have been input as 21 L and 25.5 L respectively. When I do that, the required efficiency to get a 1.045 OG is 90%.

View attachment 312145

Brew on

From the description (mashing with 9.5, sparging 10.5) I was figuring that OP had 21L pre-boil, and then the final volume would be a number smaller than that (5 gal/18.9L).

Assuming your numbers (25.5L preboil to get to 21L), with 72% efficiency, that would indeed get the OG down to 1035. That appears to be what the recipe was assuming.

If OP started with 21L, FG would be much higher. Combined with higher than expected efficiency, that could then get him to 1045.

 

[sorefingers23]

Will this have any affect on the final product other than higher abv?


Sent from my iPhone using Home Brew

 

[Aristotelian]

Will this have any affect on the final product other than higher abv?


Sent from my iPhone using Home Brew

No, it looks like you followed the recipe but with less water and higher efficiency. Flavor should be the same. You have probably made an Pale Ale or ESB instead of a Mild.