this post was submitted on 28 Dec 2024
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[–] BananaTrifleViolin@lemmy.world 123 points 1 week ago (1 children)

The biggest problem is he's engineering in Imperial instead of SI units.

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[–] GissaMittJobb@lemmy.ml 81 points 1 week ago (3 children)

Am I assuming correctly that we're looking at a big succ-situation, where the diver will big forced through the tube no matter what?

[–] starman2112@sh.itjust.works 57 points 1 week ago* (last edited 1 week ago) (5 children)

It's a difference of like 7 psi over an area of what looks like maybe 30 square inches, which would be uncomfortable to get caught in, but I don't think you're getting Byford Dolphined

[–] GissaMittJobb@lemmy.ml 15 points 1 week ago (2 children)

Ahhh yeah that's where I've heard it before, WTYP had an episode on that!

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[–] yetiftw@lemmy.world 14 points 1 week ago

210 lbs will certainly keep you stuck there though

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Is 5m enough for that? I feel like no, but i have no idea.

[–] Gork@lemm.ee 51 points 1 week ago* (last edited 1 week ago) (3 children)

This unfortunately happened in real life.

Edit: other way around though. The divers were on the air side (habitable quarters) of the chamber.

[–] starman2112@sh.itjust.works 50 points 1 week ago* (last edited 1 week ago) (2 children)

For more clarification, they were on the high pressure air side. The kind of dives they were doing involved long periods of acclimation to the different pressures involved, so the diving bell was pressurized to 9 atmospheres. Someone fucked up, and the door opened. 9 atmospheres turned into 1 atmosphere very quickly, and the only good thing is that it happened so fast that the deceased wouldn't have even noticed

If you want to see an episode of a podcast about engineering disasters which is itself, ironically, an engineering disaster, well there's your problem

[–] adj16@lemmy.world 28 points 1 week ago (1 children)

Just for what it’s worth, it looks like it was actually an equipment malfunction, not someone fucking up, that caused the accident. The company claimed the person fucked it in an attempt to cover their asses, and they were eventually found to be hiding the truth in a court of law.

[–] stinky@redlemmy.com 11 points 1 week ago

Justice should be violent

[–] JokeDeity@lemm.ee 23 points 1 week ago* (last edited 1 week ago) (2 children)

No one fucked up, they finally settled on it being a mechanical failure.

Edit: the company and government fucked up, I meant to imply none of the divers fucked up.

[–] Kalothar@lemmy.ca 38 points 1 week ago

The company fucked up by not updating their equipment, even though they knew it was outdated and dangerous

“The North Sea Divers Alliance, formed by early North Sea divers and the relatives of those killed, continued to press for further investigation and, in February 2008, obtained a report that indicated the real cause was faulty equipment. Clare Lucas, daughter of Roy Lucas, said: "I would go so far as to say that the Norwegian Government murdered my father because they knew that they were diving with an unsafe decompression chamber."[11] The families of the divers eventually received compensation for the damages from the Norwegian government, 26 years after the incident.[12]

[–] DudeImMacGyver@sh.itjust.works 12 points 1 week ago* (last edited 5 days ago)

The company fucked up, they did not maintain their equipment.

[–] AI_toothbrush@lemmy.zip 12 points 1 week ago (2 children)

Some parts of that article are straight horror.

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[–] fonji@sopuli.xyz 43 points 1 week ago

But where's Saddam?

[–] over_clox@lemmy.world 40 points 1 week ago* (last edited 1 week ago) (2 children)

I don't see the problem.

I mean, I don't swim, but the dynamics seem to make sense.

What am I missing?

Edit: Ah, don't go near the water passage, right?

[–] PhilipTheBucket@ponder.cat 29 points 1 week ago (2 children)
[–] over_clox@lemmy.world 8 points 1 week ago (1 children)

Ouch!

And just to think, we're all gradually evolving into crabs..

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[–] Arbiter@lemmy.world 31 points 1 week ago

When it’s got ya, it’s got ya.

[–] emerald@lemmy.blahaj.zone 30 points 1 week ago

This really Byfords my Dolphin

[–] spiritsong@lemmy.world 25 points 1 week ago (2 children)

Wouldn't this human in theory become a crumpled sausage like what happened to the crab by the leaking underwater pipe?

[–] TwoBeeSan@lemmy.world 41 points 1 week ago* (last edited 1 week ago) (3 children)
[–] zeezee@slrpnk.net 44 points 1 week ago

They also alleged the accident was due to a lack of proper equipment, including clamping mechanisms equipped with interlocking mechanisms (which would be impossible to open while the chamber system was still under pressure), outboard pressure gauges, and a safe communication system, all of which had been held back because of dispensations by the Norwegian Petroleum Directorate.

Fatigue may also have taken its toll on the crew, who had been working for longer than 12 hours

Builder of the rig Aker ASA's Gross Profit was 7.16B

Norway's oil and gas tax revenue soars to record $89 bln

Imagine forcing your workers into more than 12h shifts, running on 30 year old equipment, the government straight up refusing to upgrade said equipment, while making billions in profits - they don't call it gross profit for no reason....

[–] Canonical_Warlock@lemmy.dbzer0.com 15 points 1 week ago (2 children)

Fuck all of this

Normally when people say this it is at least a bit of an exageration, but not in this case. That is some straight up nightmare fuel.

Heres a taster for those of you who don't want to read the whole thing.

...bisection of his thoracoabdominal cavity, which resulted in fragmentation of his body, followed by expulsion of all of the internal organs of his chest and abdomen...

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[–] starman2112@sh.itjust.works 22 points 1 week ago (7 children)

Not at 15 feet. I don't know enough to say how fast the water would be leaving that hole, but it's maybe a couple hundred pounds of pressure. If he even got caught, it would be super uncomfortable, but he ain't about to get ∆p'd

If you wanna see a real crab-in-a-pipe situation, look up that Byford Dolphin everyone's talking about

[–] anindefinitearticle@sh.itjust.works 7 points 1 week ago* (last edited 1 week ago) (4 children)

Let's convert to metric so we can tell.

15 ft is about 5 m.

Water pressure increases by 10,000 pa per meter (rhogh, rho=1000 kg/m^3, g~10m/s^2), so total pressure is 50 kpa, or 1/2 earth atmospheric pressure.

One side of that hole has ambient pressure of 1 atm. The other side has that plus water pressure totalling 1.5 atm.

A pressure is just an energy density. Multiply by the cross-sectional area of the interface to get the energy gradient across the interface. An energy gradient is a force. We don't have a measure of the cross-sectional area of the hole, but if we expect a person to fit through let's call it 1m^2.

50 kpa = 50 kJ/m^3, so total force felt across this opening is 50kN which is the equivalent weight of five metric tons.

Size of the hole absolutely matters. If it's only the size of a fist (10cm x 10cm) then instead of 5 metric tons it's only 50 kg of equivalent weight, or about the weight of a person and easily survivable.

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[–] grandma@sh.itjust.works 25 points 1 week ago

DELTA P 🗣️🗣️

[–] gandalf_der_12te@discuss.tchncs.de 24 points 1 week ago* (last edited 1 week ago) (4 children)

anon's in trouble because they're using psi instead of bar.

Edit: also fuck high pressures are a scary thing.

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[–] Jolteon@lemmy.zip 21 points 1 week ago (3 children)

I'm unfamiliar with fluid dynamics. How intense would the Delta p problem be in this situation?

[–] Gladaed@feddit.org 13 points 1 week ago (1 children)
[–] baldingpudenda@lemmy.world 22 points 1 week ago (1 children)

from the wiki

Investigation by forensic pathologists determined that Hellevik, being exposed to the highest pressure gradient and in the process of moving to secure the inner door, was forced through the crescent-shaped opening measuring 60 centimetres (24 in) long created by the jammed interior trunk door. With the escaping air and pressure, gross dismemberment ensued; it included bisection of his thoracoabdominal cavity, which resulted in fragmentation of his body, followed by expulsion of all of the internal organs of his chest and abdomen, except the trachea and a section of small intestine, and of the thoracic spine. These were projected some distance from the bell, with one section being found 10 metres (30 ft) vertically above the exterior pressure door.

Soup indeed.

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[–] ryannathans@aussie.zone 12 points 1 week ago (1 children)

I feel like a delta of less than 10 psi doesn't sound so bad

[–] vithigar@lemmy.ca 19 points 1 week ago (3 children)

It depends on the size of the opening. If it's small that's no problem. You could block a 1 inch pipe at 10psi with your bare hand and be largely fine. It's a little less than 10 pounds of force assuming a round opening.

The problem is that the total force scales geometrically with the size of the opening. Make it two feet wide at the same 10psi and now you've got about 4500 pounds of force trying to push you though that opening should you find yourself in the unfortunate situation that it's been completely blocked by your body.

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[–] GBU_28@lemm.ee 7 points 1 week ago
[–] ShinkanTrain@lemmy.ml 20 points 1 week ago (4 children)

Do NOT put your dick or butthole there

[–] BuboScandiacus@mander.xyz 18 points 1 week ago (13 children)
[–] Zacryon@feddit.org 35 points 1 week ago (2 children)

Muricas version of pressure.

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[–] teije9@lemmy.blahaj.zone 15 points 1 week ago (1 children)

pounds per square inch. the us version of bar or n/m²

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[–] Nomecks@lemmy.ca 11 points 1 week ago

It's what you need to power your Protoss army

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[–] oysterenjoyer@sh.itjust.works 13 points 1 week ago

Top 10 ∆P incidents

[–] spiritsong@lemmy.world 12 points 1 week ago

Yeah I read about it. Definitely not the nicest way to go.

[–] LostXOR@fedia.io 11 points 1 week ago

Water go sluuuurp, human go squish.

[–] nthavoc 10 points 1 week ago

Safety video for anyone with an interest: https://www.youtube.com/watch?v=AEtbFm_CjE0 Delta P is stuff of nightmares.

[–] tacosanonymous@lemm.ee 10 points 1 week ago

Danger Zone!

[–] SalaciousBCrumb@lemy.lol 8 points 1 week ago

Is this like the end of that Aliens movie?

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