Sweet info and vid. I couldn't find parts 5 and 6 on youtube so here's a link to the PBS website for the full version.
Extreme Cave Diving | NOVA | PBS Video
Extreme Cave Diving | NOVA | PBS Video
Mariana Trench in Perspective
- Thread starter bbianchi
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ianr33
Contributor
Really? has anyone actually done that to check?
A tank has to be more resistant to implosion than explosion.
Not saying I dont believe you,but it sounds wrong to me.
Edit: pressure at 15,000 feet is around 6800psi. if the tank was filled to 3000 psi at the surface then the pressure differential is 3800 psi. I have seen an Al tank filled to 3800 psi and it certainly did not explode. (If it had I would not be writing this! )
Jon Nellis
Contributor
Cylindrical objects are much more susceptible to crushing/implosion than explosion since the internal pressure puts the metal in tension, evenly dispersing the load. Cylinders under external pressure don't fail due to compressive loading, but do fail due to buckling of the non-uniform material thickness and "out-of-roundness".
Look how much internal pressure a plastic soda bottle or aluminum can will withstand, versus vacuum pressure.
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Look how much internal pressure a plastic soda bottle or aluminum can will withstand, versus vacuum pressure.
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Peter_C
Contributor
So if the tank imploded at say 15,000 feet down, how long would it take the bubbles to get to the surface? Would they disperse so far that you wouldn't even notice the air reaching the surface? Hmm...
Jon Nellis
Contributor
I suspect that few if any bubbles would actually make it to the surface. My guess is that most would go into solution on the way up.
If you have a tank to donate we could test it in the Monterey canyon at a lower fill pressure.
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If you have a tank to donate we could test it in the Monterey canyon at a lower fill pressure.
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