Piping software

Hi Guys!

I'm an Engineer and I'm so excited to get my very first Macbook Pro. It's so awesome! Anyway, I'm looking for a mac software that is similar to AUTOCAD P&ID or BLUEBEAM REVU. It's for designing P&ID and Isometric Drawings for Piping System. If you know where can i get the software please help me here. Thanks guys! Hope to hear from all the experts soon...;D

might work, or might not. You can check it out.

http://sourceforge.net/projects/free-cad/?source=directory