this post was submitted on 28 Dec 2024

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Early_To_Risa@sh.itjust.works

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Anon's in trouble (sh.itjust.works)

submitted 1 week ago by Early_To_Risa@sh.itjust.works to c/greentext@sh.itjust.works

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[–] gandalf_der_12te@discuss.tchncs.de 23 points 6 days ago* (last edited 6 days ago) (1 children)

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

Edit: also fuck high pressures are a scary thing.

[–] TheBrideWoreCrimson@sopuli.xyz 6 points 6 days ago (2 children)

Pascal FTW.

[–] UltraGiGaGigantic@lemmy.ml 4 points 5 days ago

He is so dreamy

[–] Trantarius@lemmy.dbzer0.com 3 points 6 days ago (1 children)

Think you mean mmHg

[–] booly@sh.itjust.works 2 points 6 days ago

We have mmHg at home (feet water)

[–] nthavoc 10 points 6 days ago

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

[–] oysterenjoyer@sh.itjust.works 13 points 6 days ago

Top 10 ∆P incidents

[–] populustree@lemmy.blahaj.zone 5 points 6 days ago

is it just me or does this look like the cover of You Would Rather an Astronaut?

[–] BananaTrifleViolin@lemmy.world 122 points 1 week ago (1 children)

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

[–] r_thndr@lemmy.dbzer0.com 6 points 6 days ago

I thought the same way, then became an American engineer. Fuck a horsepower, because it's so goddamned context dependent.

[–] GissaMittJobb@lemmy.ml 80 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 56 points 1 week ago* (last edited 1 week ago) (6 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

[–] where_am_i@sh.itjust.works 6 points 6 days ago

from a different reply I understood the meaning of the last two words: https://en.m.wikipedia.org/wiki/Byford_Dolphin

[–] BleatingZombie@lemmy.world 3 points 6 days ago (1 children)

If you were on your back and had your legs above the hole, is 7 psi strong enough that you wouldn't be able to fight it?

I guess another question would be "how strong would it be compared to gravity?" (if anybody has any idea)

[–] starman2112@sh.itjust.works 3 points 6 days ago

It very much depends on the size of the hole. 7 psi over 1 square inch is 7 lbs, but the same pressure over 100 square inches is 700 lbs.

For a naive estimate, the hole looks around 6 inches wide, which gives it an area of around 30 square inches, so there's like 200 lbs of water pressure over the area of the hole. An even more naive assumption is that if you were "standing" over the hole in the wall, you would feel 200 lbs of pressure forcing you "down," which I think most people could easily handle. I'm doing more than that right now!

Unfortunately I don't know how to even start to calculate the force of the water on you as it rushes past you, but my gut instinct is that it wouldn't be more than the total pressure in the hole

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[–] Gork@lemm.ee 51 points 1 week ago* (last edited 1 week ago) (5 children)

This unfortunately happened in real life.

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

[–] sukhmel@programming.dev 7 points 6 days ago

The families of the divers eventually received compensation for the damages from the Norwegian government, 26 years after the incident.

Well, it's good that some justice was finally achieved, but that is depressing level of covering up (as usual)

[–] starman2112@sh.itjust.works 50 points 1 week ago* (last edited 1 week ago) (5 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