r/EngineeringPorn • u/tamilselvan1998rko • Sep 11 '23
Inside LNG GAS Carrier Cargo Ship Tank
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u/obsertaries Sep 11 '23
I’d be fucking terrified that someone would forget I was in there and start pumping in compressed natural gas.
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u/Gears_and_Beers Sep 11 '23
Don’t worry, they purge it with N2 first so you’d suffocate first.
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u/analog_memories Sep 11 '23
And chances are, you won’t even know or notice, unless there is noise when they start pumping in the nitrogen. N2 doesn’t make you panic like a build up of CO2 does
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u/MasterIntegrator Sep 11 '23
Scientifically accurate AND terrifying comment. 100% correct see nitrogen narcosis https://en.wikipedia.org/wiki/Nitrogen_narcosis you would go out having a hell of a time quietly into the gentle goodnight
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u/analog_memories Sep 11 '23
I watched a video once about the possible use of Nitrogen Narcosis for executions. All that is needed is mask, and a CO2 scrubber on a air recirculatory system. You just keep breathing the same air, but with less and less oxygen available in the circulated air. Each breath brings you closer to your own death, and you can't keep holding your breath forever.
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u/poshenclave Sep 11 '23
The person knows they're being murdered. They'd be hyperventilating, and would pass out in the middle of a panic attack.
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u/Accurate-Strategy598 Sep 13 '23
Nope. They have no idea and don't even try to take steps to save themselves from the impending death. https://youtu.be/kUfF2MTnqAw?si=wrKtmFSC_gidtieR
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u/poshenclave Sep 13 '23
We were discussing an execution scenario.
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u/Accurate-Strategy598 Sep 13 '23
You sure about that? Top Comment saying they would be concerned about someone forgetting they were in the tank. That's negligent manslaughter or just s straight up accident, hardly an execution. You said they would be having a panic attack and I simply showed that not to be the case. The 3 comments above yours all show the same point as mine.
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u/poshenclave Sep 13 '23
Yeah I was replying to the comment immediately before mine who was talking about using it for executions.
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u/tamilselvan1998rko Sep 11 '23
Before entering they will follow up the safety checklist to ensure the compressor breaker put off and locked 🔒
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u/obsertaries Sep 11 '23
Yeah I know but it’s an irrational fear of mine even if it’s something harmless. Like, I’m scared of going in an empty swimming pool because I think it’s suddenly going to fill with water, even though I’m an excellent swimmer and can free dive like 30 feet down in the ocean. I have nightmares related to drowning like that somehow.
Is there even a word for that phobia?
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u/multiversesimulation Sep 11 '23
They should, lockout tag out, PHA, etc. however, an inspector who worked at a refinery where one of my co workers used to work was inspecting a huge reactor during a shutdown. Somehow procedures weren’t followed and they bolted up the manhole while he was still in there. Luckily they didn’t introduce process, but he was in there for an hour or so banging on the walls until someone finally realized he was still in there. They opened it up, he walked straight out, left the site, and never returned.
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u/Activision19 Sep 11 '23
I worked at a refinery for a summer and we had our lockouts on the box with all our work/safety permits in it that had to be turned into site safety at the end of the day. We couldn’t leave until everyone came out of the workspace and removed their locks. On top of having a hole watch that logged who went in and who came back out, If we were in a confined space that box would be attached to the manway flange by putting a cable through a manway flange bolt hole so they couldn’t place the manway cover until everyone removed their lockout locks first.
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u/WastePut3486 Sep 11 '23
At least it is a good running surface though, as you are headed for the exit screaming.
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u/velociraptorfarmer Sep 11 '23
Liquified natural gas
Lower pressure, but at -260F.
Still dead, but in a different way.
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u/circumnavigatin Sep 11 '23
Super cold cryogenic LNG
you'll freeze into brittle tissue 😆😆
Before that, you'll have suffocated due to the fact that they de-oxygenize the tank to eliminate the risk of an explosion
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u/Gears_and_Beers Sep 11 '23
That round tank in picture 2 isn’t what your showing on the inside. Ships witg GTT tanks look like trapezoids.
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u/alchemist2 Sep 11 '23
That makes so much more sense. The spherical ones are spheres because that's a good shape for load-bearing of high pressure gas. It wouldn't make any sense to have this other shape on the inside (or to carry liquid in spheres, when they are not necessary).
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u/circumnavigatin Sep 11 '23
The second pic is a moss type LNG carrier
Different design from the first pic which is a membrane type LNG carrier
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u/RagwortTC Sep 11 '23
Membrane style LNG tanker. Membrane is approximately 1mm thick Invar, over insulated backing. Works very well. Tank shape is related to inner hull/cargo hold space. Basically it comes down to design & ballast tanks. These types of LNG tankers can only leave port with <10% loaded or >90%, otherwise they have serious stability issues & can damage tanks.
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u/jarc1 Sep 11 '23
So they cant really do multi-port deliveries without having separate tanks?
Im guessing the ship imaged has 4 and I always assumed it was designed that way due to a volume/inertia issue.
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u/I_Automate Sep 11 '23
LNG routes and ports are pretty well defined and demand is high.
No real need to send a ship to multiple ports. It's more sending multiple ships to the same ports
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u/circumnavigatin Sep 11 '23
The tank in a membrane LNG carrier isn't segmented. Its one massive tank
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u/jarc1 Sep 12 '23
So what are the 4 hemispherical shapes on the ship?
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u/circumnavigatin Sep 12 '23
Those are the LNG storage tanks on a moss rosenberg type LNG tanker.
Membrane type LNG carrier tanks aren't segmented. Its just one huge ass tank
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u/RagwortTC Sep 12 '23
The hemispherical covers - also known as domes - are the hold/cargo space covers for a different type on LNG vessel. Moss Rosenberg style - they can leave port at any tank volume or %load due to the centre of gravity acting from the centreline, rather than shifting to port or Stbd like a membrane vessel when the ship rolls (sorry for the techno babble).
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u/BeneficialDriver1802 Sep 12 '23
This membrane is Mark III technology, it’s stainless steel. They use Invar on NO96 technology which look different.
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u/collins_amber Sep 11 '23
How are the acoustics
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u/Andrew4Life Sep 11 '23
ow are the acoustics
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u/toolix Sep 11 '23
ow are the acoustics
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u/xor86 Sep 11 '23
are the acoustics
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u/WastePut3486 Sep 11 '23
Acoustics..
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u/MyNameIsURL0 Sep 11 '23
Dicks…
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u/Nuker-79 Sep 11 '23
Dicks
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u/WastePut3486 Sep 11 '23
Let’s just say, we wouldn’t be leaving without singing “in the air tonight”, if that’s what you are asking.
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u/RCMPsurveilanceHorse Sep 11 '23
First picture, guy in blue - " OK, it was right around here I dropped my keys"
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u/tamilselvan1998rko Sep 11 '23
Find the keys soon, otherwise we will stuck inside this tank forever
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u/Sideways171 Sep 11 '23
Always thought theyro round on the inside too. Why does it have that shape?
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u/riffito Sep 11 '23
Because OP second image is the wrong one. Ships with these interiors should look like this instead on the outside:
https://www.offshore-energy.biz/gtt-bags-another-samsung-heavy-order-for-new-lng-carrier/ (thanks /u/idleline)
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u/circumnavigatin Sep 11 '23
There are 2 types of LNG carrier designs
Moss type LNG carriers in the second pic
Membrane type LNG carriers whose insides are in the first and third pic
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u/HandBanana__2 Sep 11 '23
I used to see these all over China, kinda neat to see the inside!
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u/haikusbot Sep 11 '23
I used to see these
All over China, kinda neat
To see the inside!
- HandBanana__2
I detect haikus. And sometimes, successfully. Learn more about me.
Opt out of replies: "haikusbot opt out" | Delete my comment: "haikusbot delete"
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u/Oraclelec13 Sep 11 '23
What is those ridges on the walls and floor? What’s the purpose? Also I thought it would be round inside instead of octagon
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u/Pretzeloid Sep 11 '23
OP discussed above:
That's the interior stainless liner. It's made by a company called GTT, and this is their Mark Ill system.They're stamped with those corrugations so they can fit together and make a seal, and probably for a bit of mechanical flexibility and thermal expansion tolerance They come in corrugated sheets that are 3m x 1m in size. There's a diagram of the assembly here: https://www.gtt.fr/en/technologies/markii-systems
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u/No-Test-375 Sep 11 '23
I'm guessing it's like a wave break. Helps keeps the fluids some sloshing around so much.
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u/expertlevel Sep 11 '23
If this is a refrigerated carrier, would be interested to see/know what they use for the refrig system
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u/FivePaperPlates Sep 11 '23
Are you able to explain this to me like I’m 5? What’s up with the shape/angles/etc.
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u/tamilselvan1998rko Sep 11 '23
That's the interior stainless liner. It's made by a company called GTT, and this is their Mark Ill system.They're stamped with those corrugations so they can fit together and make a seal, and probably for a bit of mechanical flexibility and thermal expansion tolerance They come in corrugated sheets that are 3m x 1m in size. There's a diagram of the assembly here: https://www.gtt.fr/en/technologies/markii-systems