That's cool^. What happens in a rear end collision?
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Well the way the cylinders are made probably nothing. In the event on gets punctured the gas escapes into the atmosphere. Everyone thinks fire, but combustion can't take place w/o oxygen- so the fire would be outside the tank, but under the pressure and volume of gas would be so quick and minimal. Actually carrying around 26 gal of gasoline is much more dangerous.
These are pretty small tanks (think scuba size) but the wall an psi ratings are much higher like 5000 psi rating and higher than that for burst, they are also DOT approved. You fill with 3600 psi.
Here is a link on how they test them:
http://www.oringcngfuelsystems.com/is-cng-safe/
Also I work for an Engineering department in Oil and Natural gas. I don't know everything but feel really comfortable using CNG. This is also how I ended up with the Tahoe. They had subsidized the CNG system. All of our fleet here in Oklahoma is bi-fuel.