Why Do Gas Carriers Have These Humps?

In this video, we look at gas carriers and investigate the physics behind their cargo compression for storage and transportation.

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➼ Audio used under license from Epidemic Sound

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[mfaizsyahmi]

Awesome how a merchant turned videographer can explain chemistry so effortlessly, like no pressure!

[bobbynally]

I came to learn about ship design and got a free physics lesson, ty

[MervynPartin]

I've not served on LNG carriers, but I've had 3 voyages on 2 LPG carriers. On these vessels, the cargo tanks did not protrude above the deck. Multi-stage refrigeration machinery was used to keep the cargo cold, under the supervision of the cargo engineer. Installed submersible pumps were used for cargo discharge. Products carried were Butane and Propane, and absolutely the nastiest cargo ever- Ammonia.
LNG tankers used boil-off gas to supplement the main engine fuel.

[robbabcock_]

I love that Casual Navigation routinely teaches me stuff I didn't realize I wanted to know!

[hallow]

The real reason is that they contain shark milk as an offering so that the megaladon will drink it and spare the ship

[littlekirby]

I think this was a great explanation for those who aren't already familiar with gas transport and gas partial pressures, great video!

[cmplx]

I love his voice it's so fitting to narration.... never get tired of it

[SteinGauslaaStrindhaug]

I remember one New Years Eve when it was -25°C (or maybe a little colder, I don't remember) and quite windy, so at midnight we all went outside to watch the fireworks, but in about 2 minutes we decided it was too painful and returned inside; all except the couple of guys who were crazy enough to stay outside and set of the fireworks. But apparently it was too cold for them to be able to keep the butane lighters above -0.5°C so they had to run inside between each fuse to "thaw" their hands and lighters to keep the lighters from sputtering liquid butane (and it was too windy for Zippos and matches to work). It would even keep sputtering liquids indoors for several minutes.
I think they spent more than 1 hour setting off a rather moderate amount of fireworks. It's quite impressive that none of them developed (too severe) frost bites; but I guess being forced inside to warm their hands all the time helped.

[David-hvf]

That was a very welcome primer.
Amazing how different those hydrocarbons behave with pressure and temperature changes.

[hazza]

really solid explanation about boiling and condensing with relation to pressure and temperature 👌

[ronanlyons]

You got the part about the humps wrong. This ship is the regasification vessel, its usually moored off the LPG terminal permanently and the LPG tankers come and visit it to top it up. The humps are expansion chambers for re-gassing the gas. The tankers don't have the humps.

[karlssus]

A small addendum, substances above the critical point aren't fully gaseous, but instead enter an unusual combined state called a "Supercritical Fluid." Supercritical fluids are interesting beasts, as they exhibit properties of both gas and liquid, and can be tuned to be more gas like or more fluid like by varying temperature and pressure.

[Astrophysikus]

Brilliantly explained the physics here, from gas and liquid phases all the way down to the molecular level! A very slight correction: in the PT phase diagram shown at 6:25, the curve should not have a kink at atmospheric pressure. After all, for an arbitrary substance, the pressure our atmosphere happens to have at sea level does not have any special significance.

[empirestate]

I’m pretty sure most people expected a generic video on a cool fact about ships, and it ended up turning into a physics lesson lol.

[modernNeanderthal]

I just sat, watched/read the CC of this entire video on the preview page in my phone app.

Nice video!!

[crinklecut]

You answered so many questions that I’ve had for such a long time. Thank you!

[peterjanson]

Great video, I'll be keeping an eye out for gas carriers in Montana!

[Rockefeller.]

I studied chemical engineering in college and I give you two thumbs up

[bc-guy]

Always interesting - even to a landlubber!
Thank you.

[adamsulis]

Giant Christmas ornaments :) Another great video, thanks!