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A chain cuts through a capsized cargo ship filled with cars
71–80 of 136 posts
Re: A chain cuts through a capsized cargo ship filled with cars
#72Earlier quoted context omitted.
Depends on the jurisdiction. In many countries, yes there are insurance requirements. Even in ones where there aren't, most vessels owned by larger companies carry insurance for the same reason anyone else does. On the other hand, since oceangoing ships are (mostly) regulated by the countries they're registered in, which is frequently a regulation-light jurisdiction like Panama, Liberia, or the Marshall Islands - the…
The ship in the article left Georgia to Baltimore, you cannot move goods from and to the USA with a boat that is not registered in the USA. That's is why only few cruise ship start and end their trips in the USA.
Curiously, this vessel appears to have been registered in the Marshal Islands, which is an independent nation with a rather unusual relationship [0] to the US that I hadn't heard of before. Presumably the law that requires US registration has a special provision allowing this? I wonder if the crew requirements are more relaxed with a Marshal Islands registration?
[0]: https://en.wikipedia.org/wiki/Compact_of_Free_Association
Re: A chain cuts through a capsized cargo ship filled with cars
#73This is straight up right out of that book “3 Body Problem”. https://www.reddit.com/r/threebodyproblem/comments/blxvy1/sp...
Re: A chain cuts through a capsized cargo ship filled with cars
#74The amount of ads on this website is insane.
Re: A chain cuts through a capsized cargo ship filled with cars
#75Earlier quoted context omitted.
The ship in the article left Georgia to Baltimore, you cannot move goods from and to the USA with a boat that is not registered in the USA. That's is why only few cruise ship start and end their trips in the USA.
Correct - vessels on US cabotage-restricted routes will always be registered (and crewed etc) in the US.
The law keeps a fleet of US shipping vessels and seamen around, but makes some things in Hawaii quite a bit more expensive.
Re: A chain cuts through a capsized cargo ship filled with cars
#76This related to, but not the same as, the mechanism by which modern torpedoes kill warships. Historically torpedoes used to hit the sides of ships, punching big holes. The response by ship builders was to build empty “torpedo bulges” on the sides of ships to trigger the torpedo early, preventing structural damage. Modern torpedoes instead detonate under the ship. The explosion creates a massive bubble (most explosive…
>> huge amount of force in the middle of a ship to break it.
But that isn't what they are doing. This isn't cracking the ship into halves. This is very slowly grinding a hole through the structure. Look to the edges of the cut line and you will see the failure mode of the metal is very different. No sharp/jagged fractures, more round peeling off of metal. It is the difference between using an axe and using a saw.
Re: A chain cuts through a capsized cargo ship filled with cars
#77If you ever thought tech people got paid obscene sums compared to the rest of society, just look into marine salvage, marine welding, etc. and the cost of those ships per day...
Presumably a lower margin activity though.
I would guess the opposite actually. There must be such a small number of companies that can handle these scales but a disproportionately large number of ships that we’ve produced of this size. I would bet there’s real good money to be made.
Re: A chain cuts through a capsized cargo ship filled with cars
#78Earlier quoted context omitted.
Remember that the chain moves very slowly—-7 feet per minute.
Talking "feeds and speeds", 7 feet per minute (1.4"/s) as a feed rate would obviously be crazy fast, so I presume this is the "speed", the linear reciprocating speed of the chain. It's less "cutting" and more "crunching" its way through. Sheer brute force plastic deformation.
With diamonds embedded in the chain to prevent it from wearing out as fast.
Re: A chain cuts through a capsized cargo ship filled with cars
#79I was in St. Simons a few months ago, and was able to see this ship first hand. It’s enormous, sitting on its side in what looks like just a few feet of water. It’s close to the shore, maybe a thousand or 1500 feet out. A temporary information placard had been put on the fishing pier explaining what it was. At the time it was all in one piece, but you could see them attaching the lifting equipment along the length, a…
>It must take an enormous amount of work to build an internal framework that can support the cut section being lifted from the side. I’m not surprised it’s taking so long so salvage. Ships have to be able to withstand substantial side forces (in both tension and compression) as part of torsional loading in normal operation. There's no internal framework needed. Even if there was that would require a stupid amount of…
Until the intern decides that running a nut up 30 feet of threaded rod is silly, uses two rods, and you have the Hyatt-Regency. :-)
Re: A chain cuts through a capsized cargo ship filled with cars
#80Hope this interests someone else, the size of the engineering seems impressive. I've had to cut down the title slightly to make it fit the HN character limit; hopefully it's still readable.
This is great, thanks for sharing. It makes me think that as engineers eager to fix problems or building stuff we sometimes go for the solution we are most used to from past experiences (eg. use a huge saw to cut through) instead of thinking of the simplest & most cost-effective (eg. use a chain instead).
Sometimes brute force is good enough.