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Old 11-28-2011, 06:24 AM   #1
budchx
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Default How to reach the right OG?

In my Chimay recipe the OG should be 1080 but I only had 1070(1073 with the temp correction!)
I think that's a big gap,what should I do next time to closer to the recipe OG?

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Old 11-28-2011, 09:40 AM   #2
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What is your recipe? Can you describe your procedures more fully? Was this an extract beer or a mash. The more information you give, the better advice you'll receive.

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Old 11-28-2011, 09:52 AM   #3
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Mash at a lower temperature, mash thinner.

MALT

M=More A=Alcohol L=Lower T=Temperature

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Old 11-28-2011, 01:41 PM   #4
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You should add more fermentables near the end of the boil to reach your Original Gravity.
That adjunct will typically be in the form of invert syrup, cane sugar, Extra Pale Dry Malt Extract, etc. depending on the recipe.

You can also add it after primary fermentation settles down as long as the solution is sterile (boiled).

You can also boil longer to concentrate the wort.

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Old 11-28-2011, 01:49 PM   #5
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Guys, you're giving advice and we don't even know what kind of brewing he's doing...If he's doing ag or extract. You don't have enough information to be helping yet. If he's extract brewing for example his og could simply be off from insufficient mixing. Totally different animal that needing to mash, since he's not mashing...

hercher's the only one who's on track, asking for more info rather than throwing out our pet answers....how can we answer if we really don't know the question yet?

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Old 11-28-2011, 02:15 PM   #6
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He states (1073 with temperature correction) so I assumed that he was taking his reading from a sample taken near the end of the boil duration. Mixing in this situation is a null point, because the wort is boiling, right?

It may be as simple as not accurately measuring starting/finishing liquid volumes. If your boil off rate is not precise, and your water volume is not accurate, you will never figure this problem out.

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Old 11-28-2011, 02:34 PM   #7
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Assuming that you are accurately measuring the mass of your fermentables:

Accurate liquid measurement of the pre boiled wort determines the accuracy of the pre-boil OG.
Accurate liquid measurement of the post boiled wort determines the accuracy of the post boil OG.

The mass of the sugar in solution remains the same before and after boil...
There are many potential solutions, but knowing your brewery by being a data-taking scientist will help.

Some people (including me) don't usually care about hitting the numbers. Often, I don't take any readings, and make good beer, but that success is based on a lot of practice, and a good notebook.

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Old 11-28-2011, 02:40 PM   #8
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Using a simple OG, FG, ABV calculator, you can demonstrate to yourself that an inaccuracy in post-boil volume of only one half gallon will change your OG from 1.073 to 1.080.

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Old 11-28-2011, 06:57 PM   #9
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Quote:
Originally Posted by hercher
What is your recipe? Can you describe your procedures more fully? Was this an extract beer or a mash. The more information you give, the better advice you'll receive.
Here is:
INGREDIENTS
Light Dry Malt 1kg
Black Rock Light Liquid Malt 1.5kg
250g Brewcraft Brewing Honey
50g Crushed Black Grain
40g Hallertau Hops
25g Goldings Hops
Safbrew T-58 yeast
Soft Brown Sugar 400g
i boiled the lme with hops for 35 min,
Put the grain into cold water then bring it to boil and remove the grain just before boiling point,
Add it to the wort with the liquid malt and sugar and honey and boil it for a other 5 min,
Then strained it to my fermenter and add water up to 15L
That's it
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Old 11-28-2011, 07:10 PM   #10
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Quote:
Originally Posted by budchx View Post
Here is:
INGREDIENTS
Light Dry Malt 1kg
Black Rock Light Liquid Malt 1.5kg
250g Brewcraft Brewing Honey
50g Crushed Black Grain
40g Hallertau Hops
25g Goldings Hops
Safbrew T-58 yeast
Soft Brown Sugar 400g
i boiled the lme with hops for 35 min,
Put the grain into cold water then bring it to boil and remove the grain just before boiling point,
Add it to the wort with the liquid malt and sugar and honey and boil it for a other 5 min,
Then strained it to my fermenter and add water up to 15L
That's it
I figured it was going to be this issue, and not what the other's were suggested, but until you told us you were an extract brewer all folks could do (ridiculously) speculate.

We get this question 3-4 times every day, so you're not alone. And in reality, nothing's wrong.

It's a pretty common issue for ANYONE topping off with water in the fermenter (and that includes partial mashes, extract or all grain recipes) to have an error in reading the OG...In fact, it is actually nearly impossible to mix the wort and the top off water in a way to get an accurate OG reading...

Brewers get a low reading if they get more of the top off water than the wort, conversely they get a higher number if they grabbed more of the extract than the top off water in their sample.

RM-MN has a great analogy;

Quote:
Originally Posted by RM-MN View Post
This phenomenon is easy to see if you have a glass measure cup, some dark honey, and water. Pour in half a cup of water into the glass container, then dribble in some honey. Notice the honey sinks right to the bottom? It's more dense because of the sugar it contains. Now use a toothpick to stir the water above the honey. This will simulate using a spoon in a 5 gallon container. Did you get the honey mixed in? Not likely. If you drop in some dry yeast, it will find the honey and begin eating and the activity of the yeast will mix the honey in just fine.
When I am doing an extract with grain recipe I make sure to stir for a minimum of 5 minutes (whipping up a froth to aerate as well) before I draw a grav sample and pitch my yeast....It really is an effort to integrate the wort with the top off water...This is a fairly common new brewer issue we get on here...unless you under or over topped off or the final volume for the kit was 5 gallons and you topped off to 5.5, then the issue, sorry to say, is "operator error"

More than likely your true OG is really what the recipe says it's supposed to be. And it will mix itself fine during fermentation.

And just use the number it says in the instructions as the true OG, because it will be.

So the answer is, relax and do nothing.
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