CONNECT Edition 10.10.00.72 (Update 10)
In OpenPlant Modeler, the requirement is to place a flow arrow on the pipe. Below are wiki articles explaining the steps of how to do so.
Steps to Accomplish
SEE Also
https://communities.bentley.com/products/plant/w/plant_design_and_engineering__wiki/57054/how-to-insert-a-detailed-sketch-along-with-a-note-text-in-isometrics