Standardized lines representing the flow of energy, data, or materials.
: The ISO 14617 series is a collaborative effort between ISO and the International Electrotechnical Commission (IEC) to ensure symbols are harmonized across different technical fields. ANSI Webstore Accessing the PDF Iso 14617-3 Pdf
For decades, engineers struggled with inconsistent symbols. A valve that looked one way in Germany might represent something entirely different in Japan. This lack of standardization led to catastrophic misinterpretations, costly manufacturing errors, and dangerous maintenance mistakes. Standardized lines representing the flow of energy, data,
: Links between moving parts, pivots, and joints. A valve that looked one way in Germany
While other parts of the series deal with actuators (Part 4), valves (Part 8), or piping (Part 12), Part 3 is the "grammar" of your diagram. It defines the graphical symbols for:
In the world of engineering, process control, and systems design, a single misplaced line on a diagram can lead to costly errors or safety hazards. That is why standardization is critical.