Author Topic: Closed vs under pressure transfer  (Read 3933 times)

Offline brandonmmm

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Re: Closed vs under pressure transfer
« Reply #15 on: April 24, 2017, 06:11:40 PM »
I've always thought of a closed transfer as being where the CO2 in the purged keg flows back into the fermentor.



Thank you for the informative post!

Are you able to cold crash your Brewbucket under CO2 pressure with that ball-lock adapter installed?

I'm looking for a way to cold crash in my Brewbucket without introducing oxygen...

Offline mabrungard

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Re: Closed vs under pressure transfer
« Reply #16 on: April 24, 2017, 08:41:09 PM »
martin - dumb question, I don't understand what purpose the tube is serving?  do you fill it with CO2?  how is it different than the other ambient air?

The tube is a regular blow-off. Its advantage is that it takes a lot of internal volume change to actually suck back air into the fermenter.

There is a gas-in corny post fitted onto the top of the fermenter. During lagering temp step reductions and during beer transfer, I supply CO2 into the fermenter via tank and regulator. You can just barely see the corny post in the picture I posted.
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Offline narcout

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Re: Closed vs under pressure transfer
« Reply #17 on: April 24, 2017, 10:29:58 PM »
I presume flow will start as soon as you hook up the QD to the gas in post (which is attached at the other end to the top of the fermenter)?

It's been a while since I've done it (having switched back to transferring under pressure), but I think I hooked up the gas tubing first, then the liquid tubing, then just opened up the ball valve to start the flow.

Are you able to cold crash your Brewbucket under CO2 pressure with that ball-lock adapter installed?

Yes.  In my experience the Brewbucket will hold 3-4 PSI before gas starts leaking out under the lid.  It's also been my experience that it can hold a vacuum.  When I cold crash, I pump a few PSI of CO2 into it first, then crash.  Before you rack, you need to remember to pump more CO2 in to break the vacuum, otherwise you'll suck in a bunch of air when you open the ball valve.

This is how I attached the gas post (though I think some of the parts links are no longer valid): https://www.homebrewersassociation.org/forum/index.php?topic=20241.0

I've been told by another Brewbucket user that this part also fits: http://www.ebay.ca/itm/232147603644

Though you can't swap between that and a regular airlock or blowoff tube without removing the lid like you can with the stopper assembly.  You'd attach a gas disconnect with some tubing that runs into a jar of sanitizer.  My only concern with that would be the potential for clogging if you had a lot of blowoff.
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Offline HoosierBrew

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Re: Closed vs under pressure transfer
« Reply #18 on: April 24, 2017, 10:48:43 PM »
I presume flow will start as soon as you hook up the QD to the gas in post (which is attached at the other end to the top of the fermenter)?

It's been a while since I've done it (having switched back to transferring under pressure), but I think I hooked up the gas tubing first, then the liquid tubing, then just opened up the ball valve to start the flow.

Are you able to cold crash your Brewbucket under CO2 pressure with that ball-lock adapter installed?

Yes.  In my experience the Brewbucket will hold 3-4 PSI before gas starts leaking out under the lid.  It's also been my experience that it can hold a vacuum.  When I cold crash, I pump a few PSI of CO2 into it first, then crash.  Before you rack, you need to remember to pump more CO2 in to break the vacuum, otherwise you'll suck in a bunch of air when you open the ball valve.

This is how I attached the gas post (though I think some of the parts links are no longer valid): https://www.homebrewersassociation.org/forum/index.php?topic=20241.0

I've been told by another Brewbucket user that this part also fits: http://www.ebay.ca/itm/232147603644

Though you can't swap between that and a regular airlock or blowoff tube without removing the lid like you can with the stopper assembly.  You'd attach a gas disconnect with some tubing that runs into a jar of sanitizer.  My only concern with that would be the potential for clogging if you had a lot of blowoff.



Out of curiosity, what made you decide to go back to transferring under pressure - transfer time? 
Jon H.

Offline narcout

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Re: Closed vs under pressure transfer
« Reply #19 on: April 24, 2017, 11:06:21 PM »
Out of curiosity, what made you decide to go back to transferring under pressure - transfer time?

There would be the occasional clog, and I thought racking under a bit of pressure would help.  Turns out I was using a bad liquid QD (manufacturing defect resulting in low flow).

It would probably work fine now that I have a new QD, but I've stuck with racking under pressure, probably just out of habit.   

I've also started using my 10 gallon corny keg fermentor again, which requires pressure.
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Offline HoosierBrew

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Re: Closed vs under pressure transfer
« Reply #20 on: April 24, 2017, 11:30:48 PM »
Out of curiosity, what made you decide to go back to transferring under pressure - transfer time?

There would be the occasional clog, and I thought racking under a bit of pressure would help.  Turns out I was using a bad liquid QD (manufacturing defect resulting in low flow).

It would probably work fine now that I have a new QD, but I've stuck with racking under pressure, probably just out of habit.   

I've also started using my 10 gallon corny keg fermentor again, which requires pressure.


Cool, thanks.
Jon H.

Offline brandonmmm

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Re: Closed vs under pressure transfer
« Reply #21 on: December 23, 2017, 08:39:39 PM »

I've been told by another Brewbucket user that this part also fits: http://www.ebay.ca/itm/232147603644


I wanted to circle back around on this thread just to say that this part didn't fit my brew bucket. It's real close, but I wouldn't trust it as is to hold a seal. I plan on picking up thicker orings because it's that close.

Hope this helps someone!