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PostPosted: Wed Sep 10, 2014 9:20 am 
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Pint Glass
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Joined: Sun Jul 07, 2013 9:09 pm
Posts: 72
I have an older generation of SABCO fermentor. I have always been curious about the situation in the site glass (ok - it is a hose). At the beginning of the fermentation the level in the glass is the same as in the tank. After things get going the during fermentation, the beer disappears from the site glass, then somewhere, generally about 10 days or so, it magically reappears. Logically this is a situation where pressure from the CO2 production pushes the beer our of the site glass (site glass in these is connected to the raking arm at the bottom, and liquid out at the top).

So the curiosity would be that that the CO2 has to be closed system in the dip tube - racking arm, so the CO2 production is great enough, for a while, that things shift, even with 10+ gallons of beer, until the CO2 is absorbed. Is that right?


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PostPosted: Thu Sep 11, 2014 3:36 pm 
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Pint Glass

Joined: Sun Jan 19, 2014 7:56 pm
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I am not familiar with the Sabco fermenter with a site glass, but have rigged a level sighting tube at a commercial brewery. What you observe is essentially correct, CO2 will build up more quickly than the beer can adsorb, forcing the level out of the sight glass. Then as the system stabilizes, the correct level will appear. However, before the brewery reported tariff on those tanks, we released any pressure. Usually the level would rise by many gallons, stabilize, and then we re-pressurized the tanks. The tube was calibrated without any pressure to the eighth of a BBL.

Sounds like the very good news is that you are hold enough pressure in the tank to cause this.

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