Controlled Demonstration of a Tank Trailer Vacuum Collapse by Wabash National
Why Hacker News recommends it
HN uses it as a vivid illustration of vacuum and pressure vessel failure in threads on hyperloop and submersible implosions.
What it is
A controlled demonstration by Wabash National of a tank trailer collapsing under vacuum, staged at an industry expo. The tank implodes as air is pulled out.
Recommended by 0 HN commenters across 0 different months, 2018 to 2023.
What Hacker News said
Cites candiodari · 2018-12 · on “Hyperloop startup Arrivo is shutting down as workers are laid off”
Evacuation isn't a problem at all. This is what happens to a failing vacuum tube. [this video] (note that the hyperloop will be a significantly higher vacuum. There would actually be little point in depressurizing a pipe to the level shown in the video. I hear this was done on mythbusters as well) I think you'll agree after seeing the video: attempts to let people get out of that ... there's just no point. They'll be folded into an accordion before you can say cappuccino. Literally. Failures will propagate along such a pipe at close to the speed of sound. You wouldn't get through the first "c" of cappuccino. You should restate the problem: the problem is the same as with trailer vs car crashes: p
Cites yabones · 2020-10 · on “Virgin Hyperloop picks West Virginia to test high-speed transport system”
I'm very skeptical of this concept because of how difficult it is to build and maintain a massive vacuum chamber that will experience that level of stress over its lifespan. As far as I know, the largest vacuum chamber in the world by volume is the SPF at NASA [1], which is only 37x30m in size. Building such a vessel hundreds of kilometres in length that would have bullet trains going through it multiple times a day seems dangerous and impractical. A single leak anywhere in the tube could potentially cause explosive pressurization [2]. Maybe the Hyperloop is this century's Monorail... [1] [LINK] [2] [this video]
Cites somerandomqaguy · 2023-06 · on “Top Secret U.S. Navy System Heard Titan Implosion Days Ago”
[this video] This is what a controlled vacuum implosion of a liquid tank looks like at 1 atmosphere of pressure, including cameras showing the inside of the tank. The depth of the Titanic wreck is 3800m; down there the vessel would be subjected to 380 times that pressure. So...probably.
Cites mrguyorama · 2023-06 · on “Analysis on what happens when a submarine implodes”
[this video] Here is a steel pressure tank imploding. It was under only 14.5ish psi. The Titan would have experienced HUNDREDS of psi. Also, it's pressure hull was made of Carbon Fiber, which is notorious for failing catastrophically with zero warning, whether due to a manufacturing defect like a simple nick, or just going beyond what it could physically withstand. The vessel was NEVER tested to 4000 m. It was probable that it was always going to fail at the depth needed for the titanic. There was no warning for the crew and passengers. One instant they were descending just fine, the next they are human bisque.