Small craft — Permanently installed fuel systems
1Key Takeaways
This document specifies the requirements for the design, materials, construction, installation and testing of permanently installed fuel systems as installed for internal combustion engines. It applies to all parts of permanently installed diesel and petrol fuel systems as installed, from the fuel fill opening to the p…
2Expert Interpretation
A comprehensive interpretation of the fifth edition of ISO 10088:2022, an international standard for permanent fuel systems for small ships, covering design requirements, material specifications, fire test requirements (2.5-minute fire resistance test), pressure test procedures (20kPa or 1.5 times the working pressure), fuel permeation control (A1/A2/A15 grade hose) and emission limits (gasoline system day and night emissions ≤0.11g/L/day). It is applicable to the installation and acceptance of internal combustion engine fuel systems for ships under 24 meters.
Analysis of the core content of the standard
| Technical dimensions | Gasoline system requirements | Diesel system requirements |
|---|---|---|
| Hose fire protection level | A1/A2/A15 fireproof hoses must be used (ISO 7840) | B1/B2/B15 non-fireproof hoses are allowed (ISO 8469) |
| Pressure test | ≥20kPa or 1.5 times the maximum working pressure, 5 minutes test for fuel tanks below 200L | |
| Permeation control | Day and night emissions ≤0.11g/L/day (Class 1 ships) | Not applicable |
Key technological innovations
Main updates to the 2022 version of the standard:
- Pressure test requirements: Revise the test pressure calculation method in Annex A to specify the use of 1.5 times the maximum static pressure head
- Emission control: Add Annex B to specify the gasoline system penetration test limit (≤15g/m²/24h for Class A15)
- Material compatibility: All materials are required to maintain sealing in an environment of -40°C to +80°C
Implementation points
Installation Specifications
- The distance between the gasoline tank and the engine is ≥100mm (when there is no insulation layer)
- The distance between the exhaust pipe and the fuel tank is ≥250mm (when the temperature is ＞90°C)
- The grounding resistance of all metal parts is <1Ω
Testing Procedure
- Pressure Test: Use water immersion method or leak detection liquid, and the pressure holding time is calculated as 1.5 seconds/liter (maximum 30 minutes)
- Fire Test: The components must pass the 2.5-minute open flame test (Appendix C), and maintain 2kPa pressure for 5 minutes without leakage after the test
- Emission Test: Class 1 ships must pass the 6.6°C temperature change cycle test (25.6°C→32.2°C)
Technology Evolution Analysis
Compared with the 2013 version, this standard strengthens the environmental protection requirements:
- Carbon canister system: Added working capacity requirement (0.95g/L fuel vapor adsorption capacity)
- Hose classification: Subdivided into three levels of 15/2/1 according to permeability (A15 level <15g/m²/24h)
- Test method: Introduced SHED (sealed housing evaporation determination) method to measure day and night emissions