Overview - ISO 9557:2024 (Wire rope lifting platform for inspection)
ISO 9557:2024 specifies the classification, design requirements and test methods for wire rope lifting platforms (referred to as “wire lift platform”) used as an alternative means of access for close-up inspections of under‑deck structures on ships and offshore structures. The standard addresses mechanical design, safety systems, operational testing and required documentation to ensure safe, repeatable inspection access.
Key topics and technical requirements
- Scope & classification
- Applies to portable/movable wire rope lifting platforms for under‑deck inspection.
- Drive types allowed: manual, pneumatic, electrical.
- Rated working load
- Standard rated working load: 240 kg (designed for two persons).
- Main platform structure
- Double‑man platform dimensions: 600 mm × 1 200 mm.
- Maximum bottom deflection under rated load: ≤ 6 mm.
- Guardrail minimum height: 1 000 mm; intermediate crossbar and max gaps specified (max clear spacing 100 mm, free spaces between rails ≤ 500 mm).
- Baseboard min height 100 mm; bottom plate non‑skid and must not allow a 15 mm ball to fall through.
- Inner clear width ≥ 500 mm; operating area per person ≥ 0.25 m².
- Hoisting and fastening
- Sheave-to-wire‑rope diameter ratio: ≥ 20.
- Hoisting brake torque: > 1.5 × rated hoisting torque.
- Fastening devices must withstand platform deadweight, rated load and rope weight; hull contact should be lined (e.g., rubber) to avoid paint damage.
- Safety devices
- Brake must stop platform within ≤ 100 mm braking distance.
- Overload protection and upper stroke limiter required.
- Fall arrest device: automatic locking when falling speed exceeds set limit; rated ≥ 120 kg per person and able to be manually hoisted/lowered. Must hold 120 kg for 15 minutes without slip.
- Test methods
- Prototype and production tests include no‑load and loaded cycles (three lifts/lowerings, stroke ≥ 5 m), eccentric load tests, brake slippage (15 min), emergency stop (measure slip on power loss) and emergency lowering (manual lowering ≥ 2 m).
- Marking & documentation
- Platform must carry manufacturer, model, technical parameters, serial/date. Delivery documents include operation/maintenance instructions, manufacturer certificate, spare parts list.
Applications and who uses this standard
ISO 9557:2024 is used by:
- Shipbuilders and ship designers for specifying and integrating inspection access equipment.
- Manufacturers of wire rope lifting platforms for design validation and type approval.
- Classification societies, flag administrations and surveyors for certification and acceptance.
- Ship operators, maintenance crews and offshore inspection contractors for safe inspection procedures and procurement.
- Safety officers and procurement teams requiring compliance with marine inspection access rules.
Related standards
- IMO Resolution MSC.158(78) - technical provisions for means of access for inspections (referenced in the bibliography).
- Prepared under ISO/TC 8 (Ships and marine technology), useful when coordinating with other marine design and safety standards.