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Post by rmc on Nov 4, 2012 19:38:06 GMT
Posted by kick around on July 10, 2012, from DCI (Discovery Channel International) Mythbusters forums:
No one has ever documented on film a submarine implosion, any possible way to replicate while filming? With all sympathies to sailors who passed away because of this type of accident.
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Post by memeengine on Nov 4, 2012 20:49:51 GMT
I think it would be relatively easy to prove the principle in small scale but I imagine that the OP was really after a full scale test. As was mentioned in the comments in the original thread, the cost of doing that is probably outside of the MBs show budget.
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Post by OziRiS on Nov 4, 2012 21:21:03 GMT
Hasn't this - in principle at least - been shown on the episode where Grant, Tori and Jessie tested the story about a diver's insides being pressed up through his mouth and into the helmet of an old diver's suit due to loss of pressure? I seem to remember the helmet buckling under the pressure of the water when the air hose was cut. Pretty much the same thing...
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Post by freegan on Nov 6, 2012 7:40:30 GMT
Hasn't this - in principle at least - been shown on the episode where Grant, Tori and Jessie tested the story about a diver's insides being pressed up through his mouth and into the helmet of an old diver's suit due to loss of pressure? I seem to remember the helmet buckling under the pressure of the water when the air hose was cut. Pretty much the same thing... Also quite dramatically demonstrated in online videos of oil barrels and fuel tankers filled with steam, sealed and allowed to cool. |
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Post by memeengine on Nov 6, 2012 7:50:31 GMT
Hasn't this - in principle at least - been shown on the episode where Grant, Tori and Jessie tested the story about a diver's insides being pressed up through his mouth and into the helmet of an old diver's suit due to loss of pressure? I seem to remember the helmet buckling under the pressure of the water when the air hose was cut. Pretty much the same thing... Also quite dramatically demonstrated in online videos of oil barrels and fuel tankers filled with steam, sealed and allowed to cool. While the end result is the same, the "method" is slightly different, with the submarine the external pressure is increasing while the internal pressure is constant. In the examples you give, the external pressure is constant while the internal pressure decreases. |
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Post by freegan on Nov 6, 2012 7:57:53 GMT
Also quite dramatically demonstrated in online videos of oil barrels and fuel tankers filled with steam, sealed and allowed to cool. While the end result is the same, the "method" is slightly different, with the submarine the external pressure is increasing while the internal pressure is constant. In the examples you give, the external pressure is constant while the internal pressure decreases. Isn't it the difference between external and internal pressures that is relevant rather than which increases or decreases? |
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Post by chriso on Nov 6, 2012 10:18:25 GMT
From a physics perspective yes. But as this is talking about going onto an entertainment show, I think that the layman would only be satisfied by an increasing pressure experiment. While the end result is the same, the "method" is slightly different, with the submarine the external pressure is increasing while the internal pressure is constant. In the examples you give, the external pressure is constant while the internal pressure decreases. Isn't it the difference between external and internal pressures that is relevant rather than which increases or decreases? |
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Post by The Urban Mythbuster on Nov 8, 2012 16:29:56 GMT
Isn't it the difference between external and internal pressures that is relevant rather than which increases or decreases? I would say that it does matter which increases/decreases. The pressure inside a submarine remains constant as it goes to greater depths (increasing external pressure) and there is no contraction of the vessel. But, if you were to lower the internal pressure of the submarine at a constant external presure, the submarine would begin to contract (implode). This would be the antithesis of explosive decompression of an airplane. |
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Post by freegan on Nov 8, 2012 17:28:12 GMT
there is no contraction of the vessel. "U.S. Submarines are built with a specific type of steel that contracts with pressure, and expands. A little known fact of submarine construction is that the decks are actually "floating" - they are suspended and do not actually touch the hull for this reason." Source. |
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Post by paulsee on Nov 23, 2012 9:39:51 GMT
Hmmm... I seem to recall a show that showed the effects on oil drums with reinforced sections vs plain oil drums. I think it was conducted in a pressure chamber of sorts.
Both types of drums were destroyed by pressure, but the reinforced ones were able to last under more pressure.
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Post by c64 on Dec 10, 2012 17:02:15 GMT
there is no contraction of the vessel. "U.S. Submarines are built with a specific type of steel that contracts with pressure, and expands. A little known fact of submarine construction is that the decks are actually "floating" - they are suspended and do not actually touch the hull for this reason." Source.Correct. Changing depth reveals your position to passive sonar caused by what submariners call "hull popping noise". |
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