::: spoiler Colourful NSFW description ahead
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 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. These were projected some distance from the bell, with one section being found 10 metres vertically above the exterior pressure door.
:::
I hate "delta p" so much, as in the term. I'm convinced divers just used it so they could sound even more elitist and like astronauts when they're just dudes with a few grand and nothing better to do. Erm, akshualy that isn't a vacuum, that's a device that's creates delta p. P stands for pressure and delta is a scientific notation for change. Cool dude, now finish delta p-ing your fucking room.
I'm convinced divers just used it so they could sound even more elitist and like astronauts when they're just dudes with a few grand and nothing better to do.
Hey.... Some of us just like blowing bubbles and hanging out with fish.
It is pretty fun, but to be honest not worth the money if you have to pay for the training yourself, especially if you don't live near a good diving spot.
It is pretty fun, but to be honest not worth the money if you have to pay for the training yourself, especially if you don’t live near a good diving spot.
yeah, this is very true. I'd love diving tropical stuff every day but don't want to live where it's warm lol; where I live there are some crazy folks who drysuit dive all the time, but even then it's waaaay too cold for me. I want the water warm but the rest nice and cool lol
I'm one of those crazy drysuit divers. I'm usually plenty warm on a dive, and seeing a pristine shipwreck at the bottom of the great lakes is pretty awesome
Static pressure on it's own doesn't really "do" anything though. You could have the thinest piece of solid material with 10 million atmospheres on either side and the material doesn't care since forces cancel out. Difference in pressure is where shit goes pop or crush depending on the direction.
This statement is incorrect. Pressure directly affects materials. Its just without pluging the hole with a part of your body you don't actually feel the difference. In static 10 million atmospheres stuff like metal should show some measurable shrinkage. The larger the object, the more shrinkage you will measure.
Yes, you are technically right. Little too much hyperbole on my part, but the bulk modulus of solids in typically in the tens to hundreds of gigapascals
I mean the dolphin story is gruesome. But for this diver to get a severe injury he must be very close to the hole, almost touching it.
The suction power is not that great in an underwater scenario.
What made the dolphin so gruesome is that it was an explosive decompression and besides the driver closest to the door no server dismemberment took place, only a very sudden decompression making for a very sudden yet horrid death.
If the diver in this diagram keeps a couple of centimeters away from the opening he is completely fine but if he manages to cover the outlet hole with some of his anatomy, the shit hits the fan.
I wanted to respond with a funny delta P crab video, but if you search delta P on YouTube now you get a ton of AI generated shit, including a video where a guy sticks his have in a hole and it comes out with 6 fingers.
My understanding is, this is a very common cause of death among divers. The pressure doesn't kill you, but it gets you stuck long enough that you suffocate. Because even if safety teams are notified immediately, getting you out is difficult enough that they might not be able to get you out in time before you die
The phenomenon that causes divers to be trapped is called differential pressure, or Delta P. It requires surprisingly little Delta P to trap divers in such a way that they can't free themselves.
The formula is simple: F=Δp⋅A
Δp = Differential pressure, A = the area the differential pressure acts on, in our case the cross sectional area of the pipe.
Example:
30 cm pipe => A = π⋅(0,15)² m²
Delta P only (!!!) 0.1 bar (= 10 kPa).
F = 10,000 Pa ⋅ 0.07 m² ≈ 700 N. This equals roughly 71 kg of weight.
Now, let's try this with the numbers above. Unfortunately, we don't know the diameter of the pipe so let's again assume 30 cm:
=> You would be sucked to this pipe opening with a force of roughly 330 kg. In other words, you're fucked.
For fun, let's assume a 50 cm diameter pipe:
F = 46,000 Pa ⋅ 0.196 m² ≈ 9020 N.
This equals roughly 920 kg of weight.
=> There is absolutely no escape here and I think it's safe to assume the diver would be sucked through that pipe.
And finally, to answer your question (I'll skip the math here), a 10 cm diameter pipe with the same Delta P would mean 37 kg of weight. I think it would be possible to escape in this scenario, but it'll not be effortless.
Ah, I didn't make myself clear. I am and was absolutely convinced that you can't free yourself once "plugged" unless very lucky. I was thinking about the bring sucked into pieces aspect. But it's the same calculation I guess. How much force can human body structure take? I think 330kg static pressure wouldn't rip you apart but when there is some movement involved there is some extra momentum. I think that could work. Or we increase the area. But then we don't have the nice space movie effect of being sucked through a small slot.
Edit and also j didn't read the whole comment. Especially the block where you talked about the part that I just repeated. Sorry and thanks for your work :)
77 Comments
birdwing@lemmy.blahaj.zone · 126 pts · 104d
i remember a greentext about this, and a wiki article, but where is it again? I thought it was the Norwegian oil platform disaster but no
there was some talk about how they got discombobulated and their bodies had gross dismemberment or something, being entirely suctioned through
edit: aha, found the article!
the causes:
::: spoiler Colourful NSFW description ahead 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 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. These were projected some distance from the bell, with one section being found 10 metres vertically above the exterior pressure door. :::
Malyca@lemmy.zip · 21 pts · 104d
Compression divers too
FilthyHands@sh.itjust.works · 82 pts · 104d
Delta P doesn't care. Delta P doesn't give a shit.
altphoto@lemmy.today · 5 pts · 103d
Don't know about you, but I never take a shit without my Delta_P! Thanks Delta_P!
SillyDude@lemmy.zip · -2 pts · 104d
I hate "delta p" so much, as in the term. I'm convinced divers just used it so they could sound even more elitist and like astronauts when they're just dudes with a few grand and nothing better to do. Erm, akshualy that isn't a vacuum, that's a device that's creates delta p. P stands for pressure and delta is a scientific notation for change. Cool dude, now finish delta p-ing your fucking room.
TranscendentalEmpire@lemmy.today · 35 pts · 104d
Hey.... Some of us just like blowing bubbles and hanging out with fish.
It is pretty fun, but to be honest not worth the money if you have to pay for the training yourself, especially if you don't live near a good diving spot.
mojofrododojo@lemmy.world · 5 pts · 103d
yeah, this is very true. I'd love diving tropical stuff every day but don't want to live where it's warm lol; where I live there are some crazy folks who drysuit dive all the time, but even then it's waaaay too cold for me. I want the water warm but the rest nice and cool lol
Taldan@lemmy.world · 5 pts · 103d
I'm one of those crazy drysuit divers. I'm usually plenty warm on a dive, and seeing a pristine shipwreck at the bottom of the great lakes is pretty awesome
Brosplosion@lemmy.zip · 17 pts · 104d
Static pressure on it's own doesn't really "do" anything though. You could have the thinest piece of solid material with 10 million atmospheres on either side and the material doesn't care since forces cancel out. Difference in pressure is where shit goes pop or crush depending on the direction.
Taldan@lemmy.world · 7 pts · 103d
Divers frequently go to pressures of 500+ PSI without issues directly from the pressure
Nearly all the issues at that depth are from the physiology of breathing gasses at that pressure
wewbull@feddit.uk · 1 pts · 102d
That's 34atm or about 330m. Nobody is diving that deep on a regular basis. It's the world record.
altphoto@lemmy.today · 3 pts · 103d
This statement is incorrect. Pressure directly affects materials. Its just without pluging the hole with a part of your body you don't actually feel the difference. In static 10 million atmospheres stuff like metal should show some measurable shrinkage. The larger the object, the more shrinkage you will measure.
Brosplosion@lemmy.zip · 3 pts · 103d
Yes, you are technically right. Little too much hyperbole on my part, but the bulk modulus of solids in typically in the tens to hundreds of gigapascals
FilthyHands@sh.itjust.works · 13 pts · 104d
You made me delta p my pants.
Taldan@lemmy.world · 13 pts · 103d
Delta P isn't a diving term. It's an occupational safety term
Wolf314159@startrek.website · 5 pts · 103d
SillyDude@lemmy.zip · -5 pts · 103d
Wolf314159@startrek.website · 3 pts · 103d
joelfromaus@aussie.zone · 66 pts · 104d
I’ll never forget this video of a crab being sucked into a pipe being cut or this one of a diver in a similar situation.
Alexstarfire@lemmy.world · 73 pts · 104d
It's harder to get that second link by people these days. Previews.
mapleseedfall@lemmy.world · 44 pts · 103d
I click it voluntarily. Its a good song
faercol@lemmy.blahaj.zone · 3 pts · 102d
Also we know the URL by now
Hootwog@lemmy.world · 19 pts · 104d
10/10 no notes
peaceful_world_view@lemmy.world · 12 pts · 104d
an oldie but a goody
volvoxvsmarla@sopuli.xyz · 4 pts · 102d
Damn ._.
blimthepixie@lemmy.dbzer0.com · 43 pts · 104d
Just like the Byford Dolphin
https://en.wikipedia.org/wiki/Byford_Dolphin
rizzothesmall@sh.itjust.works · 25 pts · 104d
Jeeeeeyzus that was a read
Morphit@feddit.uk · 4 pts · 103d
One of todays unfortunate 10,000.
Bytemeister@lemmy.world · 8 pts · 104d
Actually very different.
blimthepixie@lemmy.dbzer0.com · 7 pts · 104d
Both involve pressure
Bytemeister@lemmy.world · 20 pts · 104d
The Challenger disaster and the Ford Pinto both involved vehicles bursting into flames.
Akasazh@lemmy.world · 40 pts · 104d
I mean the dolphin story is gruesome. But for this diver to get a severe injury he must be very close to the hole, almost touching it.
The suction power is not that great in an underwater scenario.
What made the dolphin so gruesome is that it was an explosive decompression and besides the driver closest to the door no server dismemberment took place, only a very sudden decompression making for a very sudden yet horrid death.
If the diver in this diagram keeps a couple of centimeters away from the opening he is completely fine but if he manages to cover the outlet hole with some of his anatomy, the shit hits the fan.
Mouselemming@sh.itjust.works · 31 pts · 104d
Sooooo ... Don't put your dick in it, yeah?
usualsuspect191@lemmy.ca · 27 pts · 104d
Just near it enough to get a little suction
Morphit@feddit.uk · 3 pts · 103d
In case you need some product advice: https://m.youtube.com/watch?v=6YHEK6-Ili8
leagman1@feddit.org · 26 pts · 103d
How about a small cylinder? The cylinder must remain unharmed though
Akasazh@lemmy.world · 7 pts · 104d
Well it would make for quite the 'out of body experience'. And if thats your kink I won't shame it.
I would sort out your estate beforehand, if you catch my drift.
LibertyLizard@slrpnk.net · 30 pts · 104d
Is that enough pressure differential to injure you? Get stuck yes but 6.5 PSI doesn't seem that crazy.
duckythescientist@sh.itjust.works · 29 pts · 104d
Actually maybe. Imagine you got your back stuck on a 1 ft diameter pipe. That's 735 lbs pushing on you.
rizzothesmall@sh.itjust.works · 39 pts · 104d
Add the in the weight and speed of the water already moving through the pipe and the pressure on the other side becomes hugely negative.
You're going in that pipe.
panda_abyss@lemmy.ca · 58 pts · 104d
But I don’t want to go in the pipe
UnimportantHuman@lemmy.ml · 36 pts · 104d
You're still getting piped buddy
chortle_tortle@mander.xyz · 13 pts · 104d
Rip to your homogenate or whatever, but I would simply avoid the pipe 😏
panda_abyss@lemmy.ca · 5 pts · 104d
I wanted to respond with a funny delta P crab video, but if you search delta P on YouTube now you get a ton of AI generated shit, including a video where a guy sticks his have in a hole and it comes out with 6 fingers.
They’re all like 2 months old.
I don’t know why Google did this to themselves.
Cavemanfreak@programming.dev · 6 pts · 104d
Found it for you! It's as frightening as the first time I saw it...
Edit: Just saw that someone linked it further down three hours ago...
Hawke@lemmy.world · 4 pts · 104d
Here ya go. Not so much funny as sad.
https://youtu.be/Wv14vZx6jvU
jmill@lemmy.zip · 33 pts · 104d
That hole may not have been made for you, but you WILL fit.
Malfeasant@lemmy.world · 2 pts · 103d
That's what she said...
Malyca@lemmy.zip · 10 pts · 104d
You really don't
socsa@piefed.social · 5 pts · 104d
Get in the pipe, Shinji.
ivanafterall@lemmy.world · 3 pts · 103d
Shh, it's easiest if you just go with it.
Trainguyrom@reddthat.com · 1 pts · 102d
You get to experience the shift from physiology to physics today!
Contramuffin@lemmy.world · 19 pts · 104d
My understanding is, this is a very common cause of death among divers. The pressure doesn't kill you, but it gets you stuck long enough that you suffocate. Because even if safety teams are notified immediately, getting you out is difficult enough that they might not be able to get you out in time before you die
Gladaed@feddit.org · 15 pts · 104d
Soup like homogenate
bizarroland@lemmy.world · 7 pts · 104d
Probably the closest thing to experiencing a black hole the average human being that is currently alive could ever encounter.
socsa@piefed.social · 4 pts · 104d
It depends on the actual cross sectional area of the space.
WraithGear@lemmy.world · 1 pts · 104d
MousePotatoDoesStuff@lemmy.world · 21 pts · 104d
Physics is a cruel mistress.
cows_are_underrated@feddit.org · 14 pts · 103d
Can someone please explain the reference to me?
87Six@lemmy.zip · 46 pts · 103d
Bro is about to be sucked into the opening and mangled to death then drown because of the flow / pressure / whatever
hereiamagain@sh.itjust.works · 13 pts · 103d
Delta-P
prenatal_confusion@feddit.org · 6 pts · 103d
It would not let them go once attached but sucking through? If the hole is 10cm in diameter i would think it wouldn't rip them apart.
But let's physics this please!
glorkon@lemmy.world · 3 pts · 102d
Let's do it:
The phenomenon that causes divers to be trapped is called differential pressure, or Delta P. It requires surprisingly little Delta P to trap divers in such a way that they can't free themselves.
The formula is simple: F=Δp⋅A
Δp = Differential pressure, A = the area the differential pressure acts on, in our case the cross sectional area of the pipe.
Example:
30 cm pipe => A = π⋅(0,15)² m²
Delta P only (!!!) 0.1 bar (= 10 kPa).
F = 10,000 Pa ⋅ 0.07 m² ≈ 700 N. This equals roughly 71 kg of weight.
Now, let's try this with the numbers above. Unfortunately, we don't know the diameter of the pipe so let's again assume 30 cm:
Δp = 21.375 - 14.7 psi = 6.675 psi ≈ 0.46 bar = 46 kPA
F = 46,000 Pa ⋅ 0.07 m² ≈ 3250 N.
=> You would be sucked to this pipe opening with a force of roughly 330 kg. In other words, you're fucked.
For fun, let's assume a 50 cm diameter pipe:
F = 46,000 Pa ⋅ 0.196 m² ≈ 9020 N.
This equals roughly 920 kg of weight.
=> There is absolutely no escape here and I think it's safe to assume the diver would be sucked through that pipe.
And finally, to answer your question (I'll skip the math here), a 10 cm diameter pipe with the same Delta P would mean 37 kg of weight. I think it would be possible to escape in this scenario, but it'll not be effortless.
prenatal_confusion@feddit.org · 1 pts · 102d
Ah, I didn't make myself clear. I am and was absolutely convinced that you can't free yourself once "plugged" unless very lucky. I was thinking about the bring sucked into pieces aspect. But it's the same calculation I guess. How much force can human body structure take? I think 330kg static pressure wouldn't rip you apart but when there is some movement involved there is some extra momentum. I think that could work. Or we increase the area. But then we don't have the nice space movie effect of being sucked through a small slot.
Edit and also j didn't read the whole comment. Especially the block where you talked about the part that I just repeated. Sorry and thanks for your work :)
TubularTittyFrog@lemmy.world · 21 pts · 103d
guys ! don't stick your butthole near the pool drain pipe
no matter how good you think it might feel on your butt.
404@lemmy.zip · 15 pts · 103d
Related reading: Guts, a short story by Chuck Palahniuk: https://theallfreenovel.com/21077/1/guts (nsfl)
RangerAndTheCat@lemmy.world · 1 pts · 93d
Fucking eh… pearl diving still haunts me after reading this years ago thanks for the walk down memory lane lol
Nosavingthrow@lemmy.world · 2 pts · 102d
Dvorak plays
PabloSexcrowbar@piefed.social · 13 pts · 104d
Wait, where's Saddam Hussein?
qevlarr@lemmy.world · 6 pts · 103d
When it's got ya... It's got ya!
Let's watch that video again, it's been a couple of years again
los0220@lemmy.world · 5 pts · 104d
2137 spotted
whyNotSquirrel@sh.itjust.works · 4 pts · 102d
I don't get it:
To reach 1 bar pressure you need ~10m of water no?
psud@aussie.zone · 5 pts · 102d
Depends. They are probably meaning 0.4 bar greater than the pressure at the surface which is approximately 1 bar
To get one bar more than at the surface you need ten metres
forkDestroyer@infosec.pub · 1 pts · 102d
What's the formula for this?
glorkon@lemmy.world · 4 pts · 102d
F=Δp⋅A
_aamon@piefed.zip · 4 pts · 102d
2137 (and a half)!
melsaskca@lemmy.ca · 3 pts · 102d
I have no clue what any of this means, yet I laughed.
Olgratin_Magmatoe@slrpnk.net · 5 pts · 102d
That man is gonna go through that pipe and become spaghetti
Rookeh@startrek.website · 3 pts · 104d
I'm not sure if this is triggering either thalassophobia or submechanophobia but either way thanks I hate it
MisterFrog@lemmy.world · 2 pts · 99d
Can someone who feels pain everyday (uses imperial) explain wtf HL/17 is supposed to mean?
fossilesque@mander.xyz · 4 pts · 99d