Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:12:p3
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 12 (pt 3/5)
Character Range: 1892101–1895153

to the nearest 0.1 km of a single purge cycle described in paragraph 6.5.3. of this annex, km.

              6.6.1.6.  Preparation of carbon canister depressurisation puff loss loading
              After completing carbon canister loading and purging, the test vehicle shall be moved into an enclosure, either a SHED or an appropriate climatic chamber. It shall be demonstrated that the system is leak-free and the pressurisation is performed in a normal way during the test or by a separate test (e.g. by means of pressure sensor on the vehicle). The test vehicle shall be subsequently exposed to the first 11 hours of the ambient temperature profile specified for the diurnal emission test in Table C3/1 with a maximum deviation of 2 °C at any time. The average temperature deviation from the profile, calculated using the absolute value of each measured deviation, shall not exceed 1 °C. The ambient temperature shall be measured and recorded at least every 10 minutes.
              6.6.1.7. Carbon canister puff loss loading
              6.6.1.7.1. Fuel tank depressurisation before refuelling
              The manufacturer shall ensure that the refuelling operation cannot be initiated before the sealed fuel tank system is fully depressurised to a pressure less than 2.5 kPa above ambient pressure in normal vehicle operation and use. At the request of the responsible authority, the manufacturer shall provide detailed information or demonstrate proof of operation (e.g. by means of pressure sensor on the vehicle). Any other technical solution may be allowed provided that a safe refuelling operation is ensured and that no excessive emissions are released to the atmosphere before the refuelling device is connected to the vehicle.
              6.6.1.7.2. Within 15 minutes after the ambient temperature has reached 35 °C, the tank relief valve shall be opened to load the carbon canister. This loading procedure may be performed either inside or outside an enclosure. The carbon canister loaded according to this paragraph shall be disconnected and shall be kept in the soak area.

              6.6.1.8. Measurement of depressurisation puff loss overflow

               The depressurisation puff loss overflow shall be measured using the process in either paragraph 6.6.1.8.1. or 6.6.1.8.2. of this annex.

              6.6.1.8.1. The depressurisation puff loss overflow from the vehicle carbon canister may be measured by using an additional carbon canister identical to the vehicle's carbon canister but not necessarily aged. The additional carbon canister shall be fully purged with dry air prior to loading and shall be connected directly at the outlet of the vehicle's canister with the shortest possible tube. The additional carbon canister shall be weighed before and after the procedure described in paragraph 6.6.1.7. of this annex.

              6.6.1.8.2. The depressurisation puff loss overflow from the vehicle carbon canister during its depressurisation may be measured using a SHED.

              Within 15 minutes