What you can do to keep them really sealed, so after years they won't shift/rotate is to get "Muffler Seal." It's been years since I bought the tube, I think that was the name, it still has kept my joinings sealed.
You can put some on the pipes (about 1/2" inside the tips) and under the clamp. It's almost like a ceramic when it dries. In fact, it may be a ceramic???
My brother had to take his system down (he used the same stuff) and he said that he just gently tapped around the pipe and it chipped off. He said the pipes separated without a problem. HTH