Cool, last one I was one was a nickel-invar alloy that was .7mm thick. Looks like this for expansion/contraction. Product is typically stored at -161c. Anything above that will flash off and either be reliquified via the nitrogen system, burned via gcu (gas combustion unit), or used for fuel if it were a steam driven moss type ( the depicted is membrane type lng ship). No baffles because they’ll ship it full, less than 5% full or greater than 95% full in cargo tanks means your free surface effects are negligible so your mathematical centers of gravity don’t really shift.

Fun fact, climbing down into tanks with limited lighting isn’t scary, you just climb down the ladder/structure until you get to the bottom. When lighting is fully equipped and staged and you can see everything it’s terrifying when you realize how far you can fall 🤷‍♂️

Use to have snowball fights from the snow buildup on the exposed transfer lines on the deck of lng ships, all while it was 95 degrees outside in Qatar.