Originally Posted by kenyabob
I have a corny keg that I brewed in 2009 then I moved cities and everything sat in a garage until I finally got my chest freezer up and running last night. I put the old corny in there, and I think I might try it. Is that too big a risk? I am not sure if I purged it, since I dont know what that entails.
Basically the only "risk" is that it will taste terrible. As you may know, no harmful microorganisms can live in beer. Three years of fluctuating temperatures though, and with the possibility there was some air in there, I wouldn't have high hopes that it would be drinkable. But give it a try and let us know!
I think the overall answer to "how long will beer last in a keg" as long as it's properly sealed with only CO2 in the headspace, is "about as long as it would in bottles." Which is quite awhile.