Grain Absorbtion For Biab With No Squeeze

[buna_bere]

Hey All,
Here's the question.....Doing a no squeeze BIAB, how many liters/kilogram do you figure for grain absorbtion?

I just finished my first all grain BIAB no sparge and came up low on my gravity into the boiler. I used 1.04 liters/kilogram for grain absorbtion, but after reading some of the info on this site, I think 0.5 liters/kilogram would have produced better results. I guessed at a 79% efficiency into the boiler, but ended up with 60% efficiency into the boiler. I gave the bag 10 minutes of draining time in a strainer, but no squeeze. Its a Saint Rogue Red Clone, and its happily fermenting away now.

Thanks,
Bob

 

[aaronpetersen]

I don't know how you could resist. I just gotta squeeeeeze the bag!

 

[Nick JD]

I would guess there's about 20% more efficiency to be had by squeezing if you don't sparge. That's a lot of wasted sugaz!

 

[Thirsty Boy]

The bags dont drain terribly well sitting in a colander or whatever - they drain OK if they are hanging up.

To have a bit of an educated guess..

Hanging with no squeeze - 0.75 L/kg or maybe a bit less
Hanging but with a firm but not silly squeezing - 0.5 to 0.6 L/kg
Just sitting in a seive/collander etc - between 0.75 and 1.0 L/kg

 

[matr]

Did the same for my first one too. Ended up with more but lower OG. I now manually calculate the loss.

I lose between 0.65 - 0.75L per kg. I don't squeeze because I can't. I do drain for 10 - 20 mins

Usually get around 80% into the boiler.

Cheers, Mat.

 

[Bribie G]

I squeeze it to death, why not - even Coopers uses a mash press or whatever they are called - I get 80% efficiency. Rather those sugary residues end up in my brain than in the bin

 

[buna_bere]

Thanks for the quick responses, sounds like I should drop my 1 liter/kilogram to .7 or so for the next batch. Thanks again guys