[Moonman62]

They are thin. The rings shake like jello when they are being moved around.

Musk explained Friday, in response to a question about whether SpaceX would use water tower machines to make its rockets, that unmodified machines don’t work great due to lack of efficiency. The Starhopper, he explained, used 12.5 millimeter thick steel. The SN1 prototype uses four millimeter thick steel. For optimized versions, they could go as low as two millimeters in areas with a circular steel design that measures 9,000 millimeters in diameter.

https://www.inverse.com/innovation/spacex-starship-elon-musk-explains-how-it-will-beat-a-water-tower

[amorphous]

Thanks. I don't see how they safely expect to contain over 8 bar of pressure, given the diameter of tank they're using. Even 12 mm thickness may be at or below actual burst strength at 100 def. F. for SS. I know cryogenic temps give SS greater strength, but that much?

And I don't understand the need for an 8 bar safety rating for a rocket that uses turbo pumps and not pressurized tanks to move fuel/Lox to the combustion chamber. Obviously there is a lot I don't understand. Lol

[amorphous]

Outside of rocket body is getting frosty now...