If I was a rocket scientist, I could probably tell you what all these shiny little spherical tanks mounted around the second stage engines on the Saturn V at Johnson Space Center were. Unfortunately, I’m not so, unless you know and want to comment, we’ll both have to stay in the dark.
Those spherical tanks contain helium. Since helium is inert it can be used to purge lines, pressurize other tanks, or even for cooling.
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