In your brewery, overfilling is never good. Most of the time you are only losing a couple cents worth of beer when an impatient bartender doesn't wait for the foam to go down, but if your fermenters and bright tanks don't have enough vacuum relief, you could lose your entire tank.
Ashton Lewis, Master Brewer-in-Residence for Paul Mueller Company demonstrates how fast tank overfill can lead to beer siphoning out of the vent line.
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