Hi! This is my first post here, so I apologize if this this is the wrong section.
My friends and I love buying large quantities of beer in kegs to save money. We do not have a CO2 pump or anything, so we have to drink the beer quick or it goes bad. Personally, I think buying CO2 gas/pumps is a pain, and this got me thinking: Is there another keg design out there?
I have attempted to research the basics of why kegs pressurized with CO2 do not go bad. As I understand it, unlike oxygen, CO2 does not react badly with the beer and simply pressurized the keg. But, what if there was another way to pressurize the beer without CO2 or any other direct air contact?
If this has not been done before, I was thinking of designing a keg that does this very thing. Basically, some sort of bladder, or some other sturdier mechanism, inside a keg would contain the beer. Then, just regular old air could be pumped into the keg outside of the bladder, pressurizing the beer. The bladder would simply serve as a barrier from the air to the beer, while still allowing it to be pressurized. I think this would be a lot more convenient and a money saver. It could be applicable to homebrewers, beer lovers (like myself!), restaurants, bars, etc. Would the beer stay fresh using this method?
Does something like this already exist? If not, what are the drawbacks to a system like this? I'm not exactly a beer expert so any help would be greatly appreciated, thanks!