Bird -
Well perhaps it could happen, but it hasn't in the last 17 years. Besides, they'd be lightweight pieces. I figure that it's good to 250 PSI and out of the weather, I'm probably OK. PVC tends to just split anyway instead of shatter, but that's just my opinion.
Speaking of out of the weather, did I ever tell you about the time a PVC water pipe froze in my shop?
We don't get a whole lot of winter here in NW Florida, but it did get in the teens for a few days straight some time ago. I went out to the shop for something and when I opened the door I was greeted with a beautiful winter wonderland inside! I figure it had been that way for a few days.
I don't have interior finish on my walls, and the only water pipe (to the spigot just outside the door) split and sprayed a mist at least 20 feet. When it all melted I had to drill a hole in the back wall (through the sill) to let it drain. I drove a piece of copper pipe in the hole to make it stay open. I had a fan running for weeks to help it dry out.
I may have a photo somewhere, but it's not digital. It was impressive, considering it was "out of the weather".
- Just Gary