A while ago I purchased a 4-line kegerator, I have one CO2 tank that carbonates 4 kegs of beer at around 11 psi. When I bring a new uncarbonated keg online, I just add it to an empty gas line and let it carbonate slowly over the course of one week (no force carbonation at 30 psi or rolling the keg around).
About one week ago I added a brand new uncarbonated keg (Pale Ale) and I was expecting it to be carbonated today. I tried to pour my first pint and all of a sudden a lot of foam came out and it seemed to pour at a much higher pressure than my other beers. I tried to pour several more beers, but they all had the same foaming issue.
I took the keg offline, released the pressure and opened the lid and saw a lot of foam inside the keg as well.
It puzzles me how this could have happened since I have 4 beers on the same setup and none of the other kegs have a foaming issue. My regulator is still showing 11 psi. And I don't believe that there is anything wrong with the beer since I bottled another keg with my neighbor and it pours perfectly on his kegerator.
Any ideas what could have happened?