The comprehensive framework for —the international baseline for graphical symbols representing connections, pipelines, and mechanical links in technical diagrams—underwent an extensive restructuring. Understanding these changes is critical for engineers, draftsman, and process architects who rely on precise documentation.
ISO 14617-3:2002 - Graphical symbols for diagrams — Part 3: Connections and related devices
Specific disciplines were separated into isolated documents (e.g., Part 3 for Connections, Part 8 for Valves, Part 13 for Material Processing, and Part 14 for Transport Systems). iso 146173 pdf updated
System pathways representing logical or mathematical continuity.
: Permanent, semi-permanent, or fixed intersection nodes. : Physical ties, shafts, and mechanical coupling indicators
: Symbols using letter codes are no longer in this series; they have moved to ISO 15519-2 .
: Physical ties, shafts, and mechanical coupling indicators. such as (Germany)
The publication of the second edition of the ISO 14617 series marks a significant step forward in standardizing technical communication. The new versions, such as ISO 14617-1:2025 and ISO 14617-2:2025, have modernized the symbol library, removed obsolete elements, and clarified the relationships with other specialized standards.
: You can purchase and download the most up-to-date PDF directly from the ISO Standards Store ANSI Webstore : For those in the U.S., the ANSI Webstore often provides the same documents as licensed PDFs. National Standards Bodies : Check with your local authority, such as (Germany), which often sell updated translations. Please note:
ISO 14617-3:2002 - Graphical symbols for diagrams — Part 3
British Standards version, often used in Commonwealth countries.