You might want to take a hacksaw or jigsaw and cut a notch between each of those flanges (second pic down). I did that on my MSDS system two years ago when I read people were having weld problems with the heating and expanding of the metal. Cutting a notch so each pipe was able to flex independently of the others was the suggested fix.
I'm surprised MSDS hasn't started doing this by now before they ship them out.
