I didn't dry hop directly in the keg, but nonetheless, a large amount of loose pellet hop sediment made its way from my carboy. I primed and hooked up to gas and dispenser two days ago. So, I was excited to try my new beer and was able to get a few ounces out when it stopped. After clearing the dip tube, I decided to clear the lines before hooking back up. I used another keg to hold the BLC, so the clogged dip tube was no longer an issue. I was horrified to discover that there was still no flow - hop material had somehow made its way past the poppet and compacted at the top of the dispensing line, inside the tower.
I was never able to get the line out of the tower, so I tried everything I could think of. It seemed to me that applying more pressure would only cause the clog to compact even more and would be even harder to clear, so I tried to keep the pressure low. The most creative was turning the faucet upside down, opening the valve and using the auto-siphon to pump the BLC in direction opposite of the hops had flowed. After a while, I finally applied a higher PSI (40-50), fearing that the line would rupture, but after a few minutes I heard a loud "POP" and out shot the hops and BLC solution flowed.
After cleaning the mess I cleaned both lines, with absolutely no problems. But as soon as I hooked up the new keg and opened the faucet, it immediately stopped. I gave up, disconnected the dispensing line, and went to bed. I'm fairly certain that it's not clogged in the tower this time, so I am planning to rack to another keg.
So, the morale here is to avoid loose pellet hops in a keg.
To hopefully end this saga, my question is - considering the keg is full and the beer is already fully carbonated, can I expect any problems with racking using the common auto-siphon and grain bag attached to the end? Will ~5 gallons of carbonated beer foam too much for this to work?
Thanks for any help,