Overview
ISO 16147:2020 specifies safety and design requirements for engine‑mounted fuel, oil and electrical components on diesel inboard engines fitted to small craft (hull length up to 24 m, per ISO 8666). The standard aims to minimize fuel leakage, reduce the risk of electric shock, and limit the risk and spread of fire originating from engine‑mounted systems.
Key topics and requirements
- Scope and definitions: Applies to engine‑mounted components that remain on the engine while it operates; covers diesel fuel including blends and FAME (fatty acid methyl ester).
- Environmental performance: Materials and components must operate between −10 °C and +80 °C and be storable between −30 °C and +80 °C without failure or leakage.
- Fuel system integrity
- Leak‑free operation: No dripping, wetting or misting at joints under normal operation.
- Materials resistant to diesel, biodiesel (FAME) and common contaminants; non‑wicking seals required (gaskets, O‑rings).
- Fire resistance: Filters, flexible hoses and fittings must withstand a 2.5 minute fire test (ISO 10088 Annex B or ISO 7840 Annex A).
- High‑ and low‑pressure lines
- High‑pressure fuel pipes must be pressure‑rated and secured against vibration.
- Low‑pressure hoses must comply with ISO 7840:2013, be clamped or permanently terminated; diameters >25 mm require two clamps and a spud ≥35 mm.
- Hoses must be routed away from non‑insulated surfaces above 200 °C and remain accessible for inspection.
- Filters and mounting
- Fuel and oil filters must be independently supported, readily accessible and not located above turbochargers or uncooled exhaust manifolds.
- Electrical safety
- DC installations per ISO 13297:2020; AC installations per IEC 60092‑507:2014 or ISO 13297.
- Engine‑mounted ECMs and shift/throttle controls to meet ISO 25197:2020.
- Wiring sized per ISO 13297, routed clear of moving parts, protected from vibration and chafing.
- Required degrees of protection (IEC 60529/IP): IP X7 (immersion), IP X5 (splash), IP 2X (protected locations); relays/fuse boxes/ECMs typically IP67/IP55/IP20 depending on exposure.
- Documentation
- Installation manual must specify minimum fuel supply/return diameters, maximum vertical suction height, maximum fuel line length from tank bottom to engine inlet, and fuel‑return cooler requirements if needed.
Applications and users
ISO 16147:2020 is used by:
- Engine manufacturers designing inboard diesel engines and engine‑mounted assemblies
- Boat builders and integrators installing engines in small craft
- Marine electricians, installers and service technicians performing routing, connections and maintenance
- Naval architects, surveyors and regulatory bodies assessing compliance and safety
- Owners and operators seeking guidance on safe engine installations and documentation.
Related standards
Keywords: ISO 16147:2020, small craft, inboard diesel engines, engine‑mounted fuel oil electrical components, fuel leakage, fire risk, electrical safety, IP rating.
Open preview (PDF)Small craft — Inboard diesel engines — Engine-mounted fuel, oil and electrical components
