Bottle Spunding

Filtering, fining, bottling, etc

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Big Monk
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Bottle Spunding

Postby Big Monk » Thu Jun 16, 2016 11:53 am

I was speaking with Techbrau about building my lodo system and he brought up the topic of Bottle Spunding. I did some back of the envelope calcs really quick based on Kai's numbers and came up with the following:

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The above shot is just the GBF paper Helles recipe in my spreadsheet.

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The above shot shows the residual CO2.

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Above is the equation assuming 78% AA and a peak temperature of 52F.

Any thoughts? Keep me honest if any of this seems off.
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Bryan R
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Re: Bottle Spunding

Postby Bryan R » Thu Jun 16, 2016 1:15 pm

We are all at 82+% AA and my carbing happens at 40f. Otherwise nice work.
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Big Monk
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Bottle Spunding

Postby Big Monk » Thu Jun 16, 2016 1:27 pm

Bryan R wrote:We are all at 82+% AA and my carbing happens at 40f. Otherwise nice work.


Thanks Bryan.

My small batch sizes were presenting a hurdle to the Spunding keg setup. I would have had to increase my normal batch size (1.2 to 1.5 gallons) to fill the smallest kegs available.

I'm ordering the components I need now for my new brewery setup and will likely bottle this way on the first batch. I have a stash of Trappist bottles that are rated fairly high but will likely be conservative for the first go round and estimate 3 volumes on a Tripel.

Wouldn't the peak temperature be the highest fermentation temperature you reached?

I'm a little new to the kegging setups so this may not be a valid question.
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Bryan R
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Re: Bottle Spunding

Postby Bryan R » Thu Jun 16, 2016 1:30 pm

My fermentation's never see higher than 45f.
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Re: Bottle Spunding

Postby Bryan R » Thu Jun 16, 2016 1:33 pm

if you used an excel type spreadsheet, you could use your FFT test to determine your FG, and use that as the variable to determine transfer. Since transferring and spunding I find my FFt's to always be wicked close to my normal batches.
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Big Monk
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Bottle Spunding

Postby Big Monk » Thu Jun 16, 2016 1:39 pm

Bryan R wrote:if you used an excel type spreadsheet, you could use your FFT test to determine your FG, and use that as the variable to determine transfer. Since transferring and spunding I find my FFt's to always be wicked close to my normal batches.


I just revised my brewing spreadsheet to reflect a lot of the things I've read on the forum. I tried to make it geared towards lodo. Since I already have AA% as a user input variable in my spreadsheet, inputting the FFT result will feed the packaging section and calculate transfer gravity.

Here is 82% AA and 45°F:

Image
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Taswegian
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Re: Bottle Spunding

Postby Taswegian » Fri Jun 17, 2016 3:00 am

I've been brewing 25L batches (done four LoDO batches now) so I bottle some after the keg is filled. My method for the bottles:
- Use PET bottles (the brown ones that are made for beer)
- Get to know what proper carbonation feels like when you squeeze the bottle
- Bottle with about 1P of gravity left (enough to over-carbonate the beer)
- Check the bottles every day or two; loosen (then replace) the lid to release pressure if it's over-carbonated.
This works nicely, and from experience these bottles can handle WAY more carbonation than heavy glass bottles. It is a bit time consuming, but OK for small amounts of beer.
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Big Monk
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Bottle Spunding

Postby Big Monk » Fri Jun 17, 2016 5:01 am

Taswegian wrote:I've been brewing 25L batches (done four LoDO batches now) so I bottle some after the keg is filled. My method for the bottles:
- Use PET bottles (the brown ones that are made for beer)
- Get to know what proper carbonation feels like when you squeeze the bottle
- Bottle with about 1P of gravity left (enough to over-carbonate the beer)
- Check the bottles every day or two; loosen (then replace) the lid to release pressure if it's over-carbonated.
This works nicely, and from experience these bottles can handle WAY more carbonation than heavy glass bottles. It is a bit time consuming, but OK for small amounts of beer.


As a short term solution PET sounds like a handy idea but I would think that over the long term oxygen ingress into the bottles would occur. They are rated for 10 volumes so pressure certainly isn't an issue.

I would also think that loosening the cap is also an opportunity for oxygen ingress.
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Re: Bottle Spunding

Postby Bryan R » Fri Jun 17, 2016 10:46 am

Did you pull the download of this? I would like to play with it. Thanks
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Big Monk
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Bottle Spunding

Postby Big Monk » Fri Jun 17, 2016 11:10 am

Here is the correct link. I had some edits and didnt update the link:

https://drive.google.com/open?id=0B8F3C ... 2xjbXZoaU0

I need to comment it out a bit as some of the behind the scenes stuff that can be manipulated is not so obvious.

Just unhide the hidden sheets for the Data/Analysis pages.
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