Exam Question

### (a) Purpose of Jacketed High-Pressure Fuel Pipes
Jacketed or sheathed high-pressure fuel pipes are a critical safety feature mandated by SOLAS (Chapter II-2, Regulation 4) for use on marine diesel engines with a power output greater than 375 kW. Their primary purpose is to **prevent engine room fires** by containing fuel leaks.
Key reasons for their employment are:
1. **Containment of High-Pressure Leaks**: The high-pressure fuel lines between the fuel pump and the injector operate at extremely high pressures (up to and over 2000 bar). A failure in this line (e.g., from fatigue, vibration, or improper fitting) would result in the fuel being released as a fine, highly atomized spray or aerosol.