P&I-D-drawings with Mac-computers P&I-D-drawings with Mac-computers virk (Chemical) (OP) 27 Sep 13 02:23 What program(s) do you suggest for the drawing of process&instrumentation diagrams (P&I-D) with Mac-computers? Is there any experience? Kind regards virk RE: P&I-D-drawings with Mac-computers LiteYear (Computer) 2 Oct 13 20:43 OmniGraffle. No experience with P&ID specifically, but plenty impressed for general diagramming. Suspect there'd be a library of symbols somewhere you can use.