Overview
SIST ISO 14617-2:2025 - Graphical symbols for diagrams - Part 2: Graphical symbols - defines a comprehensive symbol library for use in industrial diagrams, technical drawings and process documentation. The standard supplies the graphical symbols (Tables 1–149) for representing industrial components, products and processing elements. General presentation rules are in ISO 14617-1, and normative Annex A of this part gives application rules. Informative Annex B lists symbols deleted from earlier editions and Annex C provides an alphabetic index.
Key topics and technical content
- Symbol library: A catalog of standardized graphical symbols for industrial components and processes (tables of symbols for direct use or as examples).
- Application rules: Normative guidance in Annex A on how to apply symbols consistently in diagrams.
- Scope exclusions: Explicitly excludes fluid power symbols (see ISO 1219-1), electrotechnical symbols (see IEC 60617), and measurement/control function symbols (mathematical/process functions).
- Organized content areas (from the table of contents):
- General application symbols (components, variability, characteristics such as force/motion/mass flow, directions, materials, simplifications)
- Connections and devices for fluids (pipelines, joints, couplings)
- Fluid flow control (valves, dampers, taps, safety devices)
- Actuators (manual, automatic, complex)
- Fluid transport (pumps, compressors, fans)
- Fluid energy transfer (heat exchangers, condensers)
- Maintenance of the series: Notes deleted symbols from previous editions to help migration and compatibility.
Practical applications
- Create consistent and interoperable mechanical engineering diagrams, P&IDs, installation drawings, and process flow diagrams.
- Standardize symbol libraries in CAD and schematic tools to improve clarity across engineering, procurement and maintenance teams.
- Use in technical documentation, manufacturing drawings, training materials, and regulatory submissions where standardized diagram semantics reduce ambiguity.
- Aid communication between design, operations and maintenance by ensuring consistent graphical language for components and systems.
Who should use this standard
- Mechanical, process and plant engineers
- CAD designers and draughtsmen
- Technical illustrators and documentation teams
- Maintenance planners and operations engineers
- Standards managers and compliance officers
Related standards
- ISO 14617-1 (general rules and presentation for graphical symbols)
- ISO 1219-1 (fluid power symbols - exclusion noted)
- IEC 60617 (electrotechnical symbols - exclusion noted)
Sourcing and implementing ISO 14617-2:2025 helps engineering teams maintain clear, standardized diagrams for industrial systems - improving communication, reducing errors and accelerating design-to-production workflows.