Overview - ISO 15081:2011 (Graphical symbols for pressurized irrigation systems)
ISO 15081:2011 specifies standardized graphical symbols for use on drawings and diagrams related to the installation of pressurized agricultural irrigation systems. Intended as a collective application of the ISO 14617 series, this second edition (2011) updates the first edition (2005) and is designed to ensure clear, consistent representation of irrigation components across technical documentation.
Key topics and technical requirements
The standard defines symbol sets and basic design rules rather than performance or manufacturing requirements. Major technical topics include:
- General rules: group (generic) symbols that can be completed for specific components; guidance to follow ISO 81714-1 for symbol design.
- Piping and piping accessories: main/secondary pipelines, pipe connections, direction of flow, pipe changes and sleeves, flexible hoses, reclaimed and domestic water identification.
- Connections and joints: detachable/non‑detachable junctions, flanges, unions, quick‑release couplings, expansion joints, plugs and end-caps.
- Valves (three classifications):
- According to structure (gate, globe, butterfly, ball, diaphragm, three-/four‑way, etc.)
- According to operation (manual, hydraulic/pneumatic actuators, electric motor, solenoid, float, spring, cylinder)
- According to function (non‑return/check, air‑release, volumetric, control and safety valves, foot valves)
- Pumps: basic pump symbols and variants (submerged, vertical/horizontal, pumping station).
- Measuring devices: pressure gauges, water meters (diaphragm, rotameter, turbine, electromagnetic) and recorders.
- Water‑application equipment: sprinklers (full/part‑circle), pop‑ups, sprayers, drippers and emitting pipes.
- Filters and chemical injectors: strainers, media/sand filters; injection tanks and pumps (hydraulic/electrical).
- Irrigation machines and controllers: reel, traveller, centre‑pivot, moving lateral, side‑roll machines, and controllers.
Applications - who uses ISO 15081:2011
This standard is valuable for:
- Irrigation system designers and civil/agricultural engineers producing plan and schematic drawings
- Technical illustrators, CAD librarians and drafters building symbol libraries
- Equipment manufacturers and suppliers creating documentation, manuals and datasheets
- Contractors and installers interpreting technical diagrams on site
- Procurement, certification bodies and trainers seeking consistent documentation and interoperability
Practical uses include creating installation drawings, O&M manuals, CAD symbol libraries, tender documents, and training materials that reduce misinterpretation and improve communication among stakeholders.
Related standards
- ISO 81714-1 - Design rules for graphical symbols in technical documentation (normative reference)
- ISO 14617 (all parts) - Graphical symbols for diagrams (ISO 15081 is a collective application of this series)
- Referenced ISO standards in the ISO 15081 bibliography cover irrigation equipment and tests (e.g., ISO 9260, ISO 11419, ISO 9635).
