It's consistant use of a metal screen in a glass pipe that can cause the bowl to break. However, it depends alot on the size and material of the screen and whether or not the glass is Pyrex or simply a softer glass...

I have seen it happen but at the same time my hash pipe has a metal screen in it and has for quite a while. It's a fairly thick glass..

If the glass is more than 4 or 5mm thick than i'd say you should be okay.

Use the screen! The idea of eating ash isn't what i would call a good session.

Bob