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Commission Delegated Regulation (EU) No 134/2014Show full title
Commission Delegated Regulation (EU) No 134/2014 of 16 December 2013 supplementing Regulation (EU) No 168/2013 of the European Parliament and of the Council with regard to environmental and propulsion unit performance requirements and amending Annex V thereof (Text with EEA relevance)
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2. Fuel tank permeability test
2.1.Test method
2.1.1.Test temperature
The fuel tank shall be tested at a temperature of 313,2 ± 2 K (40 ± 2 °C).
2.1.2.Test fuel
The test fuel to be used shall be the reference fuel set out in Appendix 2 of Annex II. If this test procedure is used only as preconditioning for subsequent fuel storage testing referred to in Number C8 of Annex II to Regulation (EU) No 168/2013, a commercial premium-grade fuel may be used at the choice of the manufacturer and to the satisfaction of the approval authority.
2.1.3.The tank is filled with the test fuel up to 50 % of its total rated capacity and allowed to rest in the ambient air at a temperature of 313,2 ± 2 K until there is a constant weight loss. That period shall be at least four weeks (pre-storage period). The tank is emptied and then refilled with test fuel to 50 % of its rated capacity.
2.1.4.The tank is stored under the stabilising conditions at a temperature of 313,2 ± 2 K until its contents are at the test temperature. The tank is then sealed. The pressure rise in the tank during the test may be compensated.
2.1.5.The weight loss due to diffusion shall be measured during the eight-week test. During that period, a maximum quantity of 20 000 mg may escape from the fuel tank, on average, every 24 hours.
2.1.6.If the diffusion losses are greater, the fuel loss shall also be determined at a test temperature of 296,2 ± 2 K (23 ± 2 °C), all other conditions being maintained (pre-storage at 313,2 ± 2 K). The loss determined under those conditions shall not exceed 10 000 mg per 24 hours.
2.2.All fuel tanks that will undergo this test procedure as preconditioning for testing referred to in Number C8 of Annex II to Regulation (EU) No 168/2013 shall be duly identified.
2.3.The permeability evaporation test results shall not be averaged between the different tested fuel tanks, but the worst-case diffusion loss rate observed of any one of those fuel tanks shall be taken and compared against the maximum permitted loss rate set out in point 2.1.5 and, if applicable, in point 2.1.6.
2.4.Fuel tank permeability test conducted with internal pressure compensation
If the fuel tank permeability test is conducted with internal pressure compensation, which shall be noted in the test report, the fuel loss resulting from the pressure compensation shall be taken into account when the diffusion loss is calculated.
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