Co2 tank conversion?

[tbowers391]

So I scored this stainless Co2 storage tank on marketplace for dirt cheap. I was super excited because I’ve always had it in my head that I wanted one for my next boiler since they have a nice shape usually and a domed top. Guy says it’s just about 30 gal capacity, which is perfect because I’m mashing in 30gal barrels now so can strip an entire barrel in one run.

Anyway, I loaded it up and drove it home. Was pumped on how heavy duty it felt. Literally heavier than I thought it would be. Well, got it home and started inspecting more and noticed the domed top had a thunk sound like it was solid if you knocked on it.

Long story short, Co2 tank construction seems to be WAY different than I thought. From my research it looks like a tank inside a tank maybe? With an insulated jacket between that might even be in vacuum?

So this kind of threw my plans in a mess because I was thinking I would just weld or braze a couple ferrules to the top like I did my keg build, a drain on the bottom, and two locations for heating elements, but that seems like it might be more of a pain than I thought because of having to weld or braze each wall to seal the inner tank around the ferrules?

But then I also thought, this might be something I could use to my advantage? Maybe able to turn that space into a steam jacket or use the insulation to my advantage somehow?

I don’t know… I’ll admit I have no clue what I’m dealing with now and just looking for advice from those smarter than I? Anyone ever have experience with these or something like it?

Added a couple photos of my keg build which is what I thought I would be able to do with this tank.