Let me offer some additional remarks to my previous post.

I wanted to clarify that although I keep talking about the +Y support that lifts off, this support is not the primary focus of my concerns except for over-span situations.

My main concern is to evaluate the system for sustained stresses as a result of the redistributed loads. The weight reaction that was supported on the support that lifted up is now reacting on other parts of the piping system. I remove the +Y that lifts to evaluate the piping system with the increased weight reactions on other parts of the system as a sustained case.