Overview
ISO 9089:2019 - Marine structures - Mobile offshore units - Mooring positioning windlasses and winches - defines classification, technical requirements and test methods for mooring positioning windlasses and winches used on mobile offshore floating units (drill-ships, semi‑submersible rigs, production and accommodation platforms). It applies to design, manufacturing and acceptance testing, and can be used as a reference for ship‑shifting/positioning winches on pipelaying, crane and pile‑driving vessels. The standard also covers designation, marking and required documentation.
Key topics and technical requirements
- Classification: Types A–E (chains, wire ropes, friction drums, combined systems, cylinder‑driven hoists).
- Functional requirements: no‑load and nominal‑load behavior, nominal speed selection (agreed between manufacturer and purchaser), stalling/slipping load criteria.
- Braking systems: dual static brakes per drum/cable lifter, automatic braking for motor‑driven units, emergency power for emergency release and braking.
- Emergency release: must permit anchor line emergency release within 10 s with controlled payout and protected controls to avoid misoperation.
- Anchor deployment control: dynamic braking and speed limitation to control deployment loads (deployment speed guideline ≤ 2.5 m/s).
- Monitoring and instrumentation: means to measure anchor line length, speed and two calibrated tension measuring devices (accuracy ≤ 5% of range; recommended range 10–70% of breaking load).
- Chain/wire rope stoppers & ratchets: stoppers capable of withstanding chain/rope breaking load; ratchet strength ≥ stalling load (used for maintenance or holding).
- Design and construction: general deck machinery requirements; examples include cable‑lifter tooth count (≥5) and drum diameter recommendations (≥16 × rope diameter).
- Testing & acceptance: type inspection sequences, performance and operational tests, and documentation requirements.
Applications
ISO 9089:2019 is used to:
- Specify technical requirements for new mooring winch and windlass designs.
- Define factory and sea acceptance testing criteria for manufacturers and shipyards.
- Guide procurement and inspection by offshore operators and classification societies.
- Serve as a reference for retrofits, replacements and ship‑shifting winches on pipelayers, crane and pile‑driving vessels.
Who should use this standard
- Offshore equipment designers and manufacturers
- Shipyards and platform builders
- Classification societies and surveyors
- Offshore operators, rig managers and procurement engineers
- Field service and test engineers performing acceptance tests
Related standards
Normative and related documents referenced in ISO 9089:2019 include:
Practical takeaway: ISO 9089:2019 provides a comprehensive, testable framework for safe, reliable mooring positioning windlasses and winches used across offshore mobile units, supporting consistent design, inspection and operation.
Open preview (PDF)Marine structures — Mobile offshore units — Mooring positioning windlasses and winches
