Overview
ISO 6115:1988 - "Shipbuilding - Trawl winches" defines requirements, characteristics and test criteria for single-drum and double-drum trawl winches used on fishing vessels. It covers winches driven by electric, electro‑hydraulic, hydraulic, diesel‑hydraulic or externally powered drives, and addresses design, control, safety, brakes, spooling and acceptance testing for deck-mounted trawl winches.
Key topics and technical requirements
- Scope & definitions: Covers single- and double‑drum configurations and key terms such as nominal size, drum load, design torque, and nominal trawl‑rope winding diameters.
- Drive and control: Specifies requirements for electrical (conforming to IEC 92 and IEC 529) and hydraulic drives (ISO 4413 / ISO 2944), and mandates local and remote control options; separate control for individual drums where applicable.
- Spooling and drum design:
- Spooling gear is required on the main drum unless otherwise agreed; mechanical spooling must handle fleet angles up to 60°.
- Drum diameter shall be at least 14× design rope diameter; flange projection minima defined (with/without spooling gear).
- Design rope reference: ISO 2408 steel wire rope.
- Braking and overload protection:
- Automatic braking required; manual release must be possible.
- Total braking torque ≥ 1.5× design torque. Regenerative braking and friction braking performance and limitations are specified (e.g., friction brake absorption at 0.5× design torque at twice nominal speed).
- Overload protection during hauling-in: operate for overloads ≤ 1.5× drum load; time‑interval protection to handle transient spikes.
- Measures to prevent paying‑out the whole rope (minimum ~20 windings retained) and emergency stop provisions.
- Materials & structural checks: Design stresses and material strength criteria are defined (limits tied to 0.2 % proof stress and breaking strength) and manufacturers must account for maximum motor torque and braking torque.
- Acceptance tests: No‑load running, hauling‑in at design torque and at 125% for short duration, and brake testing at 1.5× design torque. Operational checks include bearings, noise, power consumption and instrument functionality.
- Environmental design: Typical ambient temperature ranges specified (e.g., -25 °C to +45 °C on open decks).
Applications and who uses ISO 6115
- Shipbuilders and naval architects designing fishing vessels and deck machinery
- Winch manufacturers and system integrators (electric/hydraulic drive systems)
- Marine engineers, maintenance teams and safety officers implementing safe winch operation and testing
- Classification societies and purchasers specifying acceptance tests and compliance
- Fishing-gear designers and operators selecting winch capabilities (drum loads, rope lengths, speeds)
Related standards
Normative and referenced standards include ISO 2408, ISO 4413, ISO 2944, ISO 3828, ISO 6482, ISO 7825 and IEC 92 / IEC 529 for electrical enclosures - consult these when specifying drives, ropes, controls and enclosures.
Keywords: ISO 6115, trawl winches, shipbuilding, deck machinery, drum load, design torque, spooling gear, winch brakes, hydraulic drive, acceptance tests.
