Compressed Gas Cylinder Wind Chime

Step 2 Drain the tank

Empty the cylinder.  In my case it was an old oxygen tank and from conception to actually doing the project it was a couple of months. I opened the valve to let it drain then put it off in a corner and left it for a while.  Just use a pair of pliers to open the valve.  At this point I was pretty sure all of the gas had dissipated so I was not too worried about the tank becoming a missile.

Also Oxygen is not flammable BY ITSELF...  It helps things burn better.  Better safe than sorry though so open the valve and leave it alone for a while!