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Old 10-23-2010, 06:25 PM   #1
Zeppman
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Default created a vacuum in carboy?

So I was just about to keg my fat tire clone which has been in the primary for 3 weeks. I go to check on it, and somehow it had managed to suck water through the blow off tube and into the carboy!? I have never heard of this happening. It literally sucked nearly half a gallon of water with iodophor in it through the blow off tube! I fear my beer is ruined...

Does anyone know how this could of happened?

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Old 10-23-2010, 06:29 PM   #2
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temperature changes can cause suck back....

what was in your blow off jug? plain water? star san solution?

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Old 10-23-2010, 06:31 PM   #3
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Suckback happens all the time, usually in betterbottles. But a change in temp will often draw the liquid in the airlock (or blowoff vessel) into the fermenter. What did you use as your blowoff liquid.

I wouldn't panic and just see the beer through to finish. It is really a lot hardier than most brewers think, and manages to turn out OK despite what happens to it.

Read this, http://www.homebrewtalk.com/f39/what...t-great-96780/


Relax!

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Old 10-23-2010, 06:33 PM   #4
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The "blow off liquid" was water and iodophor. I know we soak our equipment in this stuff but is it safe to actually drink?

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Old 10-24-2010, 03:16 AM   #5
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If the cause of this is temp change, which way? I usually have my temp set at 72 until fermentation begins, then lower it to 67 until it's done. IPA's

What is the actual cause of this. I've never had it happen, but have heard of it. Just so I can avoid it.

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Old 10-24-2010, 03:36 PM   #6
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Quote:
Originally Posted by telebrewer View Post
If the cause of this is temp change, which way? . . . . . .
When the temperature drops and there is no co2 release. In this case I use a longer blowoff tube and coil it a couple of times between the fermentor and the blowoff, call it an anti-suckback tube.




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What is the actual cause of this. . . . .
Contraction of the beer due to the lowered temperature. I.E. When lagering or chill crashing or just general uncontrolled temperature swings after primary fermentation is at or near completion.
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Old 10-25-2010, 04:44 AM   #7
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You should market that COLObrewer, hehehe. I love the drawing

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Old 10-25-2010, 05:35 AM   #8
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You should market that COLObrewer, hehehe. I love the drawing
Agreed, drawing is classic...you could place an add on the site. When people order you simply send them the diagram explaining how to twist and coil the tube. Im sure Billy Mays would have been all over this. Cheers
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Old 10-25-2010, 05:47 AM   #9
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I've learned the hard way, but only with a little bit of starsan in an airlock, vs a blowoff bucket. When I crash cool, I just empty the airlock out and wrap it tightly in foil.

My random thought of the day:

Capture the CO2 on the way out in an inverted 2 liter bottle, in your normal blowoff bucket. When you finally crash cool the primary it will suck back in CO2 instead of liquid. I would think the blowoff tube needs to go to the top of the inverted bottle that's collecting CO2. Good luck moving this pile of stuff

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Old 10-25-2010, 08:33 AM   #10
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Quote:
Originally Posted by COLObrewer View Post
Quote:
Originally Posted by telebrewer View Post
What is the actual cause of this. . . . .
Contraction of the beer due to the lowered temperature.
It's actually contraction of the air in the headspace.
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