AVEVA Diagrams is a fast, efficient and effective tool for creating and managing your Process Flow Diagrams (PFDs), Piping and Instrumentation Diagrams (P&IDs), Heating, Ventilation, and Air Conditioning (HVAC) and similar drawings with the assurance that they remain fully integrated with the project database. AVEVA Diagrams is a fast, efficient and effective tool for creating and managing your Process Flow Diagrams (PFDs), Piping and Instrumentation Diagrams (P&IDs), Heating, Ventilation and Air Conditioning (HVAC), and similar drawings with the assurance that they remain fully integrated with the project database. ...