Evaporation Issue(?)

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StubbsPKS

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Right, so I brewed a Pumpkin Ale yesterday. I hit the expected pre-boil gravity was 1047, I hit 1044 (Corrected for temp using the forum calculator. Was 1030 @ 58C. My hydro is calibrated for 20C). Not a huge difference so I wasn't too worried.

The post-boil OG was meant to be 1057 and somehow mine is still 1044?! I don't understand how this could be.

The only thing that I can think of to explain this is that when I tested the pre-boil gravity, it wasn't ALL of the wort in the container, just most of it. The boiler couldn't hold the entire bit of wort and still safely boil, so I was adding the runnings that were left as the boil progressed. So maybe the pre-boil gravity would have been even lower once the entirety of the wort was added. Now, I've done this method before with no issues when I was doing BIAB in a smaller boiler.

I also ended up with a lot more wort than expected. Do you think this could all stem from a boil that wasn't rigorous enough? I had a SMALL boil over at one point and so I switched off the second element.

I'm stumped. I re checked the OG like 4 times to make sure I wasn't crazy, but sadly i didn't have the ability to re check the pre-boil.

All in all, the brewday was a bit of a disaster, but in the end I came out with more than an FV full of wort at 1044 which should ferment down to a decent ABV so I guess I can't complain TOO much :cool:
Any thoughts from the gurus?
 
wendy1971 said:
did you give the post boil wort a good stir up? gravity can be different after stirring. Allow 6 -7 litres of boil off during a 90 minute boil.

I was actually thinking this today. I wonder if it just hadn't all mixed together very well when I took the OG. Kinda lame I didn't think of this until today bc now I can't actually take it :(

Oh well, live and learn :thumb:
 
i boil to volume, if i have too much wort so it fits the fermenter rather than throwing extra away, a little stronger is not an issue, if it is low i can always boil it some more to get gravity, a lost pint or three is not an issue either
 
Yea, my boiler isn't marked yet. I didn't realize how much extra I had until it was cooled and draining into the FV. I REALLY need to get in gear and make a stick to tell me how much volume I have in there :oops:

This isn't the first volume related issue I've had with this setup I must admit.
 

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