I looked online, and the only PFDs I could find looked like they were just basic shapes, for the most part. In any case, why reinvent the wheel? It's very easy to make your own template in OmniGraffle. I did this a few years ago when I needed to draw some circuit diagrams, before I found the Electronics template (or perhaps even before it existed, I'm not sure). There should be a help document for creating and editing stencils. After that, you just have to make the shapes you want, then group them so that you can drag them around as one object. "Dr Trevor J. Hutley" <TrevorHutley at consultant.com> writes: > On my G4 Powerbook (so it really is on topic?) I want to create some > process flow diagrams (PFD). > This is sort of "chemical engineering". > Diagrams that show how processes (actually for polymer production) > are laid out and arranged. > Showing elements like pumps, compressors, pipes, etc. > > It seems that Visio Technical has a template for process flow > diagrams, but Omnigraffle (Pro) 4, which I have, does not. > It offers limited office and business templates but nothing > 'technical'. > > Does anyone know of any software that runs on a Mac that I could use > for creating PFD (process flow diagrams) ? > > Could be a way to create a greater presence for Mac here.