Actually with proper cleaning and proper usage the odds of winning the lottery are about the same as it blowing. The lack of pressure and heat is the real key here. As a Chemical Engineer the physics is fairly simple and about the same safety level as using oxy tanks. Oxygen and even fuel mixed in the tank is fairly difficult to combust without reaching about 400 degrees and or a lot more pressure than is in the tank. That being said even that very slight chance calls for a strict cleaning regime.
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Dave
On a Delta Elite with compressed tank and generators
"I contend we are both atheists, I just believe in one fewer god than you do. When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours."
...Stephen F Roberts
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