unifilar piping

i would like to know if any of you guys , know how can i get piping
simple lines using inventor ?
let me explain
in piping design we dont draw a pipe ( until 12") as we see it , with a
center line sorrounded by a 2 lines)we just draw a simple line
representing the whole pipe.
what i what to do is to make a whole piping project using the inventor
3d tools , and after that in the IDW environment to make the duple line
became a simple line .

thank you

 

You don't even need to use inventor, just 2006 and 3D solids


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