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Old 07-12-2011, 02:43 AM   #1
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Default missed my gravity, gravity fluctuating between batches...wtf

brewed today with anticipation of a 1.067 beer, came with 1.058. im really failing to make the connection of why i didnt hit my gravity. its actually been like every other batch i either do/dont hit numbers. last batch numbers were spot on, batch before too low, before that spot on, and so on. process remains the same and i use beersmith for calculation at what i thought was a 70% efficiency. without breaking down my brewday to every aspect (which i know must probably be done to get a legit answer) are there some standard factors why im getting low numbers every other batch?

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Old 07-12-2011, 02:52 AM   #2
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Time to do some diagnostics.

Next brew day, follow the instructions here and document every step. This way, you'll be able to figure out where you are losing sugars.

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Old 07-12-2011, 02:57 AM   #3
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Inconsistant grain crush at your LHBS perhaps?

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Old 07-12-2011, 04:05 AM   #4
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@Malfet, thanks for that. i will read over that article thoroughly before my next brewday. i really have followed the same exact steps for the last several batches, which is why im kinda pissed when its been a hit and miss with my OG.

@GryphonBrew. i do get my grains from an online supplier pre-crushed. very well known supplier so i dont wanna name drop and hate if it isnt there fault. but you have made me decide to try out another online HBS to see if its possible...

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Old 07-12-2011, 04:44 PM   #5
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Could just be a skewed beer sample for hydrometer reading. The wort sometimes settles into layers before fermentation agitates it all up. If you are pulling the sample off the top of the carboy, it could appear lighter in density (which is why it is on top).

I use the outer plastic tube from an autosiphon to pull a sample. It is long enough that I can get liquid from the whole height instead just the top section.

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Old 07-12-2011, 05:27 PM   #6
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Quote:
Originally Posted by BadWolfBrewing View Post
Could just be a skewed beer sample for hydrometer reading. The wort sometimes settles into layers before fermentation agitates it all up. If you are pulling the sample off the top of the carboy, it could appear lighter in density (which is why it is on top).

I use the outer plastic tube from an autosiphon to pull a sample. It is long enough that I can get liquid from the whole height instead just the top section.
Interesting. Ive never heard (or thought) of that. Have you actually seen significant difference in readings with this method?
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Old 07-12-2011, 05:31 PM   #7
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You're in the beginners section, are you brewing all grain or extract?

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Old 07-12-2011, 05:34 PM   #8
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Quote:
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You're in the beginners section, are you brewing all grain or extract?
AG...for a while now. I guess I should post in the other section..
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Old 07-12-2011, 05:38 PM   #9
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What about the actual weight of the grains?

I know you are using a reputable vendor and I cannot imagine any business shorting someone on purpose but we are human. I am at my LHBS when they weigh and crush my grains and they have "goofed" a few times, nothing major but still it can happen!

Just a thought

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Old 07-12-2011, 05:39 PM   #10
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Yeah, being specific helps. The reasons are different often for ag over extract and pm. BadWolfBrewing was more than likely talking about what happens whenver top off water is involved. Water and wort don't mix up that well initially, so it skewes hydro readings- get more wort than water, higher grave than recipe calls for, get more water than wort, lower grav.

In your case, I think using malfet's link is a good thing. It could be anything in your case, inconsistant grain crush is my first thought.

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