Newbie - pipe routing

Hello all, I'm just getting started with piping.  I found a tutorial through the help button in Creo, but I can't get back to it for some reason.  I managed to make the routing that I want, and I'm pretty comfortable with the interface, but I assume that I am doing something wrong.  All the pipe routes appear as lines, and not 3D pipe.  I created the Line Stock and checked the dimensions, but maybe I did something wrong.

This is a series of 16" and 24" piping coming off a suction and discharge header.

If you can tell from the screenshot, please let me know what I'm doing wrong.

Thanks in advance.