I have aquired a 15 gal keg for the purpose of making a brew pot, however I am deploying to Iraq soon and will not have the time to put it into operation before I go. The keg still has a small amount of stale old beer. My question is it advisable to leave the keg as it is for the year or more that I'll be gone, or should I atleast covert it to a brew pot so that the beer isn't sitting in the keg and possibly ruining the inside. Also I do not know how long this beer has been sitting already.