Document ID: chunk:federal_register_of_legislation:F2023L01530:body:0:p13
Version: federal_register_of_legislation:F2023L01530
Segment Type: other
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Character Range: 37594–40585

per cent relative humidity, then 25 cycles to 80 per cent NWP (+2/-0 MPa) at  -40 °C, and the remaining 200 cycles to 125 per cent NWP (+2/-0 MPa) at 20 (± 5) °C.
              (c) The hydrogen gas fuel temperature is  -40 °C;
              (d) During the first group of 250 pressure cycles, five cycles are performed with fuel having a temperature of +20 (±5) °C after temperature equilibration of the system at  -40 °C; five cycles are performed with fuel having a temperature of  -40 °C; and five cycles are performed with fuel having a temperature of  -40 °C after temperature equilibration of the system at   +50 °C and 95 per cent relative humidity;
              (e) Fifty pressure cycles are performed using a de-fuelling rate greater than or equal to the maintenance de-fuelling rate.
         5.3.3. Extreme temperature static pressure leak/permeation test.
              (a) The test is performed after each group of 250 pneumatic pressure cycles in paragraph 5.3.2.;
              (b) The maximum allowable hydrogen discharge from the compressed hydrogen storage system is 46 ml/hr/l water capacity of the storage system. (Annex 3, paragraph 4.2. test procedure);
              (c) If the measured permeation rate is greater than 0.005 mg/sec (3.6 Nml/min), a localized leak test is performed to ensure no point of localized external leakage is greater than 0.005 mg/sec (3.6 Nml/min) (Annex 3, paragraph 4.3. test procedure).

         5.3.4. Residual proof pressure test (hydraulic)
         The storage container is pressurized to 180 per cent NWP (+2/-0 MPa) and held at least 4 minutes without burst (Annex 3, paragraph 3.1. test procedure).
         5.3.5. Residual strength burst test (hydraulic)
         The storage container undergoes a hydraulic burst to verify that the burst pressure is at least 80 per cent of the baseline initial burst pressure (BPO) determined in paragraph 5.1.1. (Annex 3, paragraph 2.1. test procedure).
         5.4. Verification test for service terminating performance in fire
         This section describes the fire test with compressed hydrogen as the test gas. Compressed air may be used as an alternative test gas.
         A hydrogen storage system is pressurized to NWP and exposed to fire (Annex 3, paragraph 5.1. test procedure). A temperature-activated pressure relief device shall release the contained gases in a controlled manner without rupture.
         5.5. Requirements for primary closure devices
         The primary closure devices that isolate the high pressure hydrogen storage system, namely TPRD, check valve and shut-off valve, as described in Figure 1, shall be tested and type-approved in accordance with Part II of this Regulation and produced in conformity with the approved type.
         Retesting of the storage system is not required if alternative closure devices are provided having comparable function, fittings, materials, strength and dimensions, and satisfy the condition above. However, a change