[quote author=Ben321 link=topic=135251.msg1794869#msg1794869 date=1535968468
1 liter at 200PSI goes KABOOM if the container breaks. One liter is the size of a medium-sized soda/pop bottle. If that was filled with 200PSI of a gas, it would explode with an ear shattering BANG. You'd hear it a mile away. Standing next to it, it would probably be as loud as a 12 guage shotgun blast. And if the container was made out of metal like the coolers for the camera, you'd have pieces of metal shrapnel flying at lethal high velocities.
I can't see how you would ever say that a liter-sized container filled with 200PSI gas is safe.
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As Fraser says safety depends on more than the pressure. I depends on stored energy and containment method, exposure, maintenance and other factors.
You are right, a one liter bottle pops with an impressive bang. Though your comments sound more like a two liter bottle to me. I won't ask the source of your knowledge, but my experience is that the burst pressures of these bottles is closer to 300 psi.
So the first factor is stored energy. Say 5 CC's for the cooler (which is significantly more than many coolers). That makes the energy 200 times smaller than your one liter bottle. Now consider the failure mechanisms. Due to the small surface areas involved the tensile strengths of the tubes and structures won't be approached, so a general failure like the soda bottle is unlikely. A deep Nick, or even a cross tube fracture as might result from metal fatigue after repeated bends is going to cause something closer to a rapid leak than an explosion.
A further example. A truck tire and a bicycle tire will explode at roughly similar pressures, not greatly different from 200 psi. One can easily kill you, the other is unlikely to injure you.
Pressurized systems must be treated with respect, but also with thought and knowledge.