Overview
ISO 16858:2013 - Ships and marine technology - Loose gear of lifting appliances on ships - Pulleys - specifies requirements for hot-rolled sheaves (pulleys) used as loose gear in shipboard lifting appliances. The standard covers structural types, component definitions, basic dimensions, technical requirements, test methods, inspection rules, marking, packaging, storage and transportation. It is intended to ensure dimensional accuracy, material integrity and safe performance of sheaves used in marine lifting equipment.
Key topics and technical requirements
- Scope and components: Defines sheave parts (rim, plate/web, hub, spacer, bearing, bolt, dust washer) and basic dimensions for hot-rolled sheaves.
- Materials: Minimum material strength requirements for components (e.g., rims/plate/hub σs ≥ 235 MPa for common carbon steel; spacer sleeve σs ≥ 600 MPa for quality carbon steel). Bolt grades referenced to ISO 898; dust covers (wool felt).
- Manufacture and welding:
- Rims and web produced from a single steel piece with grooves formed by hot rolling.
- Welding of rim and hub with groove welds (double groove preferred); weld materials must match base metal strength. Post‑weld stress relief required before machining.
- Surface and hardness: Groove surface roughness and minimum surface hardness of grooves (HB260) are specified; anti‑corrosion painting and rust protection for machined areas.
- Assembly and fits: Bearing fits - outer ring to hub N7, inner ring to shaft n6; assembled sheaves must rotate freely by hand.
- Dimensional and accuracy tolerances: Detailed limit deviations for outside diameter, groove minor diameter, groove radius, rim width, lateral run‑out, cycle run‑out, cylindricity and profile tolerances (tables and formulae in the standard).
- Testing and inspection: Test methods referenced to ISO 16855; inspection items include dimensional checks, groove hardness, weld quality (appearance and internal), run-out and other tolerances.
- Use, maintenance and scrapping: Pre‑use checks (groove wear, lubrication, noise, run‑out). Scrapping criteria include rope groove wear reaching 20% of rope diameter or presence of cracks/distortion.
- Packaging, transport and storage: Protection against corrosion and damage; dry, ventilated storage away from corrosives and weather exposure.
Applications and users
ISO 16858:2013 is relevant to:
- Shipbuilders and marine equipment manufacturers producing hot‑rolled sheaves/pulleys.
- Classification societies, naval architects and rigging engineers specifying safe lifting components.
- Quality control, inspection and maintenance teams on vessels and in yards.
- Procurement professionals sourcing compliant sheaves for deck machinery, cranes, davits and other lifting appliances.
This standard helps ensure compatibility, safety and longevity of sheaves used in marine lifting systems and supports regulatory and class compliance.
Related standards
- ISO 16855 - Loose gear of lifting appliances on ships - General requirements (normative reference).
- ISO 898 - Mechanical properties of fasteners (referenced for bolt grades).