Overview
ISO 3730:2012 - Shipbuilding and marine structures: Mooring winches - defines design, operation, performance and acceptance test requirements for automatic and non-automatic mooring winches (single-drum) with hydraulic, electric or steam drives. The standard covers winches that manoeuvre, hold and store mooring ropes (and may be used for warping), specifying loads, speeds, drum design, braking, drive and control requirements and required factory tests.
Key topics and technical requirements
- Scope: Single-drum mooring winches for mooring and optional warping functions; both automatic and non-automatic types.
- Loads & performance:
- Drum load: 0.22–0.33 × breaking strength of the design rope (at nominal mooring speed).
- Holding load: ≥ 0.8 × breaking strength.
- Recovery load: ≥ 0.5 × drum load.
- Rendering load: ≤ 0.5 × breaking strength.
- Speeds:
- Nominal mooring, light-line and creep speeds are defined (creep ≤ 0.5 × nominal and ≤ 0.15 m/s).
- Drum design & ropes:
- Design ropes: specified steel wire rope constructions per ISO 2408 or synthetic fibre options.
- Minimum drum diameters: ≥ 16× rope diameter for round-strand wire; ≥ 6× for synthetic mooring lines (high-modulus fibres per manufacturer recommendations).
- Drum capacity: normal and high (high = 2× rope length of normal); layer limits (normal ≤ 5 layers, high ≤ 8 layers).
- Flange projection: steel wire ≥ 1.5× rope diameter; synthetic ≥ 1.0×.
- Strength & material stresses:
- Allowable stresses limited to fractions of material yield/proof strengths (e.g., 0.4× upper yield for drum load basis; 0.9× for some torque/holding conditions).
- Braking & control:
- Electric winches require automatic braking that holds 1.5× drum load and stops drum at max speed without damage; hydraulic/steam have specified holding and speed control criteria. Drum brakes must meet holding load requirements.
- Acceptance tests:
- Type/individual tests after assembly: no‑load and loaded operation, brake tests, holding-load verification and automatic tension tests for automatic winches.
Practical applications and users
ISO 3730:2012 is used by:
- Winch and deck machinery manufacturers (design verification, product spec).
- Shipyards and naval architects (equipment selection and installation).
- Ship owners/operators and port/terminal engineers (procurement and operational safety).
- Classification societies and inspectors for acceptance testing and certification.
- Tanker operations where OCIMF-related provisions are additionally applicable.
Related standards
Keywords: ISO 3730:2012, mooring winches, shipbuilding, deck machinery, winch design, drum load, holding load, acceptance tests, hydraulic winch, electric winch.
