Originally Posted by charmalu

That is a standard operating procedure to keep a metal line from cracking. I have seen it on brake lines also.

I have also seen it with large diameter pipes. there is an area east of Reno, Nv along I-80 where there is some sort of plant that has these large pipe lines running along the Hwy. they have a few "S" turn in the pipes every so often. this is more for expantion I think.

Charlie