May not have been acetylene. Some kids I knew when I was a sprout got ahold of some large oxygen cylinders and broke the valves off with a sledgehammer and launched them. They will go like a rocket. Always leave caps in place, chained to wall and use no oil on threads. Our distributor 10 bucks extra if you put oil on threadsi have heard of an acetylene tank blowing up on a ship and going out the side and sinking that ship and several others in the harbor skipping across the water like a torpedo that's why it sticks so you could smell it.