Fuel spray fires involving fuel leakages contacting hot surfaces and igniting happen too frequently onboard vessels. Various marine safety organizations, such as the IMO have been focusing on this issue for many years.
Source of fuel leak
The source of such a fuel leak can be a rupture on a flexible fuel hose connected to
the fuel filter assembly. The fuel filter assembly and its components installed in relatively close proximity to the turbocharger on the inboard side of the engine can also contribute.
Although components of the turbochargers may be insulated, temperatures on some surfaces typically exceed the fuel’s ignition point.
Checks to avoid fuel spray fire
- Avoid an “out of sight, out of mind mentality.” Unmanned machinery spaces should be inspected at least daily, but preferably several times per day.
- Inspect fuel and lubricating systems closely from source tanks to system endpoints.
- Regarding hot spots; examine all heat sources particularly with respect to engine exhausts. Ensure all insulation, blankets, and lagging are maintained and kept tight. Look for areas where released fluids may make contact. Check that spray shielding is kept in a place where users and consider adding such shielding around gasketed flanges and other areas if helpful.
- Minimize the use of nonmetallic flexible hoses in systems carrying flammable liquids particularly around engine areas where failures leading to leakage or spray may find hot spots capable of igniting the fluids. Consult with engine representatives if modifications are needed to minimize the risk of fuel spray fires.
- It may be beneficial for vessel owners to consult with engine manufacturer representatives to determine if a replacement schedule is necessary taking into account hose exposure to heat sources, vibration, and other factors that may degrade the hose strength internally or externally.
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