Overview
ISO 23577:2021 provides a standardized vocabulary for cargo securing systems on ships, covering general terms as well as specific terminology for container securing and ro-ro cargo securing. Developed by ISO/TC 8 (Ships and marine technology), Subcommittee SC 4, this vocabulary supports consistent communication across design, manufacture, trade, teaching and operational activities related to cargo securing.
The standard clarifies definitions for elements such as cargo unit, cargo securing device, fixed and portable fittings, and load concepts like maximum securing load (MSL), proof load (PL) and minimum breaking load (MBL). It also identifies operational concepts including lashing, securing force, lashing points, and cargo safe access.
Key Topics
- General terms: cargo securing system, cargo unit, securing, securing force, lashing, tensioning device, lashing interference.
- Load and test vocabulary: maximum securing load (MSL), proof load (PL), minimum breaking load (MBL).
- Container securing terms: container securing fitting, twistlock (manual, semi-automatic, fully automatic), lashing rod, turnbuckle, cell guide, lashing bridge, stack, tier, bay and row.
- Ro-ro specific terms: terminology for vehicle and trailer securing on ro-ro decks (standard defines ro-ro scope and associated terms).
- Safety and operations: cargo securing manual (ship-specific mandatory document), cargo safe access plan, lashing platform and fencing, lashing computer system.
These topics help create a common language for engineers, ship operators, technical trainers and regulatory bodies when specifying, inspecting or teaching cargo securing arrangements.
Applications
ISO 23577:2021 is intended for practical use across multiple disciplines involved with sea transport safety and cargo handling:
- Design and engineering: adopt consistent terms when specifying securing devices, lashing arrangements and fixed fitting layouts.
- Manufacture and trade: use standardized vocabulary for product descriptions, technical data sheets and commercial documentation for securing fittings and devices.
- Ship operation and safety: reference the standard when compiling the cargo securing manual, planning stowage and ensuring crew understand lashing and securing terms.
- Training and education: incorporate defined terms into curricula and competence assessments for deck officers and cargo handling personnel.
Benefits include improved clarity in technical documentation, reduced misinterpretation during inspections or audits, and better alignment between manufacturers, shipyards and ship operators.
Related Standards
- ISO 3874 - referenced in ISO 23577 as defining specific terms for handling and securing methods for series 1 freight containers.
- Other IMO and national guidance on cargo securing and stowage practices can be used together with ISO 23577 to ensure operational compliance and safety.
Adopting the vocabulary in ISO 23577:2021 supports safer, more consistent cargo securing practices and clearer communication across the maritime industry.