During the animation of steam inside a tank, we can see a small amount of steam leaking out. (Subtile but heartbreaking )
Also I got these bars on the jointure of tank and pipes.
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bug tank with steam.png (2.08 MiB) Viewed 4691 times
The bars look like HD graphics joining with a non-HD tank. So that's not a bug in and of itself, just a set of graphics the developers haven't updated yet.
Hmm ... did you edit multisampling option in the config.ini?
Multisampling is not currently supported because of tiling issues like this (you can see even on ground tiles don't tile properly).
Steam "leaking" from storage tank seems like a bug, though.