Originally Posted by Protagonist
not the OPD Valve (which is a regulator), the pressure relief valve. All pressure tanks have one, specifically to keep tanks from exploding due to excessive internal pressure. There's a specific name for the phenomenon: Boiling Liquid Expanding Vapor Explosion, aka BLEVE, and it's a firefighter's nightmare.
The curious can read more about propane tank pressure relief valves here: Propane Safety Relief Valve - LP Gas Tank Pressure Relief
Thanks for this. I appreciate the information.
Since speculation is always fun, how about this. The TV had a major accident where the gas tank ruptured and caught fire. The fire heated the tanks to a point where the pressure release valves opened thus turning them into torches. Keep in mind that in this scenario it wouldn't matter if your tanks were open or closed.
You see, you can make up any story to fit your purpose. It would be nice to find out what actually happened. I doubt that a spontaneous fire caused by open propane tanks would have resulted in the trailer being on top of the guard rail. But, who knows?