Cold Crashing / Mylar Balloon

[CodeSection]

I have been reading about cold crashing and the introduction of O2 (and maybe StarSan) with suck back. Since I bottle and use a bottling bucket, I do not own a CO2 tank. Thus, I was trying to find another way to stop the suck back of O2. Here is what I found:

"Use a Mylar balloon that won’t require pressure to inflate. Install it on the airlock when you still have a few gravity points to go then let the completing fermentation inflate it. When you cold crash, the balloon will deflate without exposing your beer to anything other than the CO2 it produces."

This seems the way to go. So, with so many Mylar balloons to choose from with each having a different size hole to fill, what have you found that works with silicone tubing sized 3/4" OD? If you could provide a link, it would be much appreciated.

 

[TheHopfather]

The Brulosophy guys have an article up on reducing cold side oxidation. They've got the mylar balloon method listed in the article. I think people are just taping the balloon to the tubing when they do this, nothing super fancy. I'd like to find a mylar balloon with a pressure release valve built into it so it couldn't over inflate.

http://brulosophy.com/2018/05/10/7-methods-for-reducing-cold-side-oxidation-when-brewing-beer/

 

[RPh_Guy]

I'm confused why anyone would want to cold crash before bottling.

But yeah, I would use a bung with 2 holes: one for the balloon and one for an airlock or valve.

 

[deadwolfbones]

I'm confused why anyone would want to cold crash before bottling.

But yeah, I would use a bung with 2 holes: one for the balloon and one for an airlock or valve.

Presumably to limit the amount of sediment in the bottles. Even after crashing there's plenty of yeast to carbonate.

 

[CodeSection]

@RPh_Guy, it probably doesn't makes sense to spend money on a glycol chiller to cold crash if bottling. Especially since this is coming from a guy that drinks very little of the beer that is brewed. The cost of the glycol setup easily far outweighs the benefit of less sediment in the bottles. I was hoping to refine the process and output.....

@TheHopfather, thanks for the link! Interesting read. When I was on Amazon looking at the Mylar balloons, it appeared that some of the balloon's filling hole would be too small for the tubing I was using.

... Even after crashing there's plenty of yeast to carbonate.

So I'm told. I was told it may take an extra week to carbonate. I hope you are right!

 

[CodeSection]

Just my sentiment but if the chiller is free, seems like the benefit of less sediment is greater.

I guess it is impossible to sign up for a potential free chiller giveaway if you DO NOT have a Facebook account...

 

[Holy_Grail_Reference]

I guess it is impossible to sign up for a potential free chiller giveaway if you DO NOT have a Facebook account...

I quit facebook 4 years ago. Best thing I ever did!

 

[LittleRiver]

What was said about using a stopper with 2 holes is spot on. One for the balloon, one for a blowoff tube. As for attaching the balloon to your tubing, don't over think it, you are dealing with a very small amount of pressure. Cutting away the filling adapter of the balloon, sticking in your tubing, and taping over it will work. Or you could tape in a short hard tube of a size that your flexible tubing will slip over.

There's some photos of how I rigged mine in this post.

I later updated my rig to use fermentation gas to purge my keg, as shown in this post.

 

[CodeSection]

I quit facebook 4 years ago. Best thing I ever did!

I do not have Facebook as well.

 

[Stand]

He seems to be out of stock, but @Bobby_M has a more elegant solution: https://www.brewhardware.com/ProductDetails.asp?ProductCode=CCguardianV2



I was using the Mylar bags, and I was throwing them away after every use because I was worried about cross-contamination between batches. You can't really clean them.

 

[RPh_Guy]

I was using the Mylar bags, and I was throwing them away after every use because I was worried about cross-contamination between batches. You can't really clean them.

Plastic is oxygen-permeable, unlike mylar.

Why can't you clean mylar? How is it different than this plastic balloon?

 

[Stand]

I tried and the Starsan seemed to separate the foil from the plastic. Acidity maybe? Anyway it looked gross, and I just felt like I couldn't really get in there. Maybe just being paranoid.

I hadn't thought about the oxygen-permeability, but while there is pressure inside the balloon I would think it keeps that from happening. I'm not sure how much you'd get during the cold-crash period, but I would guess it's minimum over that kind of timeframe. Those are medical bags, so I would guess (I seem to be doing a lot of that) they are designed to have low permeability.

 

[RPh_Guy]

but while there is pressure inside the balloon I would think it keeps that from happening.

Pressure doesn't affect oxygen permeability at all.

I don't know which plastic that particular balloon is, but I would definitely want to know before implementing that as a solution. Some types let through significant amount of oxygen.
Still, it's better than nothing.

 

[Vale71]

Pressure doesn't affect oxygen permeability at all.

I don't know which plastic that particular balloon is, but I would definitely want to know before implementing that as a solution. Some types let through significant amount of oxygen.
Still, it's better than nothing.

I wouldn't worry about mylar's permeability as that is a rather moot point if using silicone tubing. Silicone is just about as permeable to O2 as a pasta sieve...

 

[RPh_Guy]

That was my point, the materials involved matter a lot.

 

[kevink]

I wouldn't worry about mylar's permeability as that is a rather moot point if using silicone tubing. Silicone is just about as permeable to O2 as a pasta sieve...

I'm in the process of moving to teflon tubing for cold-side stuff for that very reason.

 

[Stand]

Pressure doesn't affect oxygen permeability at all.

I don't know which plastic that particular balloon is, but I would definitely want to know before implementing that as a solution. Some types let through significant amount of oxygen.
Still, it's better than nothing.

So you're saying CO2 can't escape, but O2 can come in? I guess O2 is smaller. I was thinking equilibrium would keep things out, but I don't know how well. I'm sure the LODO brewers would be a great resource here.

I'm in the process of moving to teflon tubing for cold-side stuff for that very reason.

https://www.micromatic.com/1-4-inch-id-barriermaster-flavourlock-tubing-548bf

Is teflon better than something like this?

 

[histo320]

So I've been following this thread and attached a Mylar balloon to my airlock for 24 hours then cold crashed. At 24 hours there has been little to no suck back.

Just got me thinking is suck back during cold crashing that big of an issue for oxidation?

 

[kevink]

Yes, when it comes to O2, everything is a big deal.

 

[Vale71]

So you're saying CO2 can't escape, but O2 can come in? I guess O2 is smaller. I was thinking equilibrium would keep things out, but I don't know how well. I'm sure the LODO brewers would be a great resource here.

Actually, CO2 is escaping as well, there's just so much of it that it takes a while for the loss to become noticeable.

 

[RPh_Guy]

So you're saying CO2 can't escape, but O2 can come in?

Diffusion occurs. Gas molecules move from areas of high concentration to low concentration.
For a permeable balloon (or tubing, etc) filled with CO2, CO2 diffuses out and O2 diffuses in. The rates of diffusion are not the same because the molecules are not the same. However, the CO2 diffusing out is of no consequence.

 

[CodeSection]

The Mylar balloon seems to work well. Here is a pic from yesterday's brew of it filling up...

 

[RPh_Guy]

Is that silicone tubing?

 

[CodeSection]

Is that silicone tubing?

Yep. What do you recommend I use that will be large enough to fit on the 1.5" TC x 5/8" barb? I might someday buy Spike's PRV and a CO2 tank with a regulator to use while crashing. But since I have no plans to keg, I was trying to avoid those purchases.

 

[day_trippr]

Not doubt the question was wrt silicone being about the worst plastic wrt oxygen permeability.
PET lined tubing with whatever fittings needed to make the trip would be at the opposite end of that aspect...

Cheers!

 

[RPh_Guy]

Vinyl would be better, or you could wrap the silicone with adhesive PTFE tape.

Otherwise, that's a really cool setup!

 

[CodeSection]

@day_trippr and @RPh_Guy thanks! Is PET the same as PVC Free? I see both the "PVC Free" and vinyl tubing here that appears to have the size (or very close) to what I would need....https://www.morebeer.com/search?search=tubing

 

[RPh_Guy]

https://www.morebeer.com/products/ultra-barrier-pvc-free-tubing-12.html
Or
https://www.morebeer.com/products/vinyl-tubing-12-id.html

Both of these are probably all right (better than silicone anyway). The EJ Beverage tubing says "Ultra-low permeability" but doesn't give specifics, unfortunately.

I'm pretty sure you could get both onto a 5/8" barb, with heating &/or lube.

 

[CodeSection]

https://www.morebeer.com/products/ultra-barrier-pvc-free-tubing-12.html
Or
https://www.morebeer.com/products/vinyl-tubing-12-id.html

Both of these are probably all right (better than silicone anyway). The EJ Beverage tubing says "Ultra-low permeability" but doesn't give specifics, unfortunately.

I'm pretty sure you could get both into a 5/8" barb, with heating &/or lube.

Thanks!

 

[day_trippr]

I can't recommend anything from EJ Beverage as their proprietary tubing has so little publically available data and what IS available suggests it's only incrementally better than solid PVC tubing wrt oxygen permeability.

PET is the way to go for the O2 adverse...

Cheers!