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Fuel Tank Vents and Plugs

Boat Safety Scheme - Fuel Tank Vents & Drain PlugsDoes every fuel tank have a vent facility? A vent line must be fitted to each fuel tank, or a vent must be fitted to either the filling cap or filling line. Does the fuel tank vent line have a minimum internal diameter of 9.5mm (3/8")? The internal diameter of vent lines must be at least 9.5mm (3/8"). Are the fuel tank vent line connections free of signs of leaks and in good condition, and are all vent hose connections accessible for inspection? All vent hose connections must be accessible for inspection,secure and free of signs of leaks or other signs of damage and/or deterioration. Vent pipe connections must be secure and free of signs of leaks, signs of damage and/or deterioration. Is the fuel tank vent line self‐draining so that fuel is not retained, and is it free of kinks or other restrictions? Vent lines must be connected to the top of the tank and be ‘self‐draining’, i.e. fall continuously from the vent outlet to the tank, or, where a swan neck is installed, from the top of the swan neck down to the vent outlet and the fuel tank connection. Vent lines must not be kinked or restricted. Is the material of the fuel tank vent line suitable and in good condition? Vent lines must not show signs of fuel leaks, damage or deterioration. Vent hose must be marked as suitable for the fuel in use or supported by an appropriate declaration. NOTE - hoses marked with the correct type of fuel in use are acceptable. Hoses marked ISO 7840, or equivalent, are recommended, and hoses marked to SAE J 1527, DIN 4798, RINA DIP/66/96 are equivalent to ISO 7840. Is the fuel tank vent outlet fitted with an effective flame arrester or flame‐arresting gauze? Vent outlets must be fitted with either a suitable proprietary flame arrester or gauze of at least 11 wires per linear cm (28 wires per inch) mesh. Where the flame arrester is not of a suitable proprietary type the openings in the arrester’s body must be at least of the same area as the cross‐sectional area of the vent line. Flame arresters or gauze must be complete and free of damage or restrictions. Are all fuel filters inside engine spaces fire resistant? Fuel filters(including drain plugs) located inside engine spaces must have intrinsic fire resistance of at least 2.5 minutes at 600˚C. NOTE - all‐metal fuel filters and drain plugs are accepted as being sufficiently fire resistant.

Boat Safety Scheme - Fuel Tank Vents & Drain PlugsDoes every fuel tank have a vent facility? A vent line must be fitted to each fuel tank, or a vent must be fitted to either the filling cap or filling line. Does the fuel tank vent line have a minimum internal diameter of 9.5mm (3/8")? The internal diameter of vent lines must be at least 9.5mm (3/8"). Are the fuel tank vent line connections free of...

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