7.4.4 Fill the tank to be tested to 25 % of its rated capacity with the intended fuel.
All openings shall be capped or plugged, exept for fuel tank ventline that shall be extended outside the fire test areas.
7.4.5 The heptane in the pan shall be ignited and permitted to burn for a continuous period of 2,5 min.
7.4.6 At the end of the 2,5 min test period, any continued burning shall be extinguished.
7.4.7 Examine the sample tank for leakage. Drain the tank. Pressure-test the tank with a slowly increased air or inert gas pressure up to 1,9 - 2,1 kPa.
The tank shall show no evidence of leakage when checked with methods other than the pressure drop method.
7.5 As installed fire resistance test of non-metallic tanks
7.5.1 This test shall be conducted to qualify tanks intended to be installed in a particular model craft,or series of craft, where the construction of the tank is known and the installation of the tank is specified or otherwise contolled.
7.5.2 Install the tank in an actual or simulated hull section of sufficient size to simulate fire conditions aboard the craft.
7.5.3 Perform a pressure test of the tank and all connecting pipes and fittings according to 7.2. Release the test pressure and leave the ventline open to simulate a normal condition.
7.5.4 Fill the tank to be tested to 25% of its rated capacity with the intended fuel.
7.5.5 Pour heptane into all crevices and liquid traps beneath the tank and into all crevices within a 75mm horizontal distance out from a vertical projection of the outmost parts of the tank.
7.5.6 The heptane in the simulated hull section shall be ignited and permitted to burn for a continuous period of 2,5 min.
7.5.7 At the end of the 2,5 min test period, any continued burning shall be extinguished.
7.5.8 Examine the sample tank for leakage. Drain the tank. Pressure-test the tank with a slowly increased air or inert gas pressure up to 1,9 - 2,1 kPa.
The tank shall show no evidence of leakage when checked with methods other than the pressure drop method.
8 Marking
All fuel tanks except integral tanks shall display the following information in contrasting or embossed letters and numerals at least 3 mm high:
- manufacturer's name or trademark, city or equivalent, and country:
- year of manufacture (last two digits);
- design capacity, expressed in litres;
- fuel or fuels in symbols for which the tank is suitable (as specified in ISO 11 192);
- maximum allowable test pressure, expressed in kilopascals;
- non-metallic tanks, fire tested in accordance with this International Standard, shall be labelled or marked "ISO xxxxx".
A supplementary label may be required to make tank information visible in the craft.
