Document ID: chunk:federal_register_of_legislation:F2023L01530:body:0:p12
Version: federal_register_of_legislation:F2023L01530
Segment Type: other
Provision Reference: 
Character Range: 35013–37797

is pressurized to 125 per cent NWP (+2/-0 MPa) at 85°C for at least 1,000 hours (Annex 3, paragraph 3.5. test procedure).
         5.2.6. Extreme temperature pressure cycling.
         The storage container is pressure cycled at  -40 °C to 80 per cent NWP
         (+2/-0 MPa) for 20 per cent number of Cycles and at  +85 °C and 95 (±2) per cent relative humidity to 125 per cent NWP (+2/-0 MPa) for 20 per cent number of Cycles (Annex 3, paragraph 2.2. test procedure).
         5.2.7. Hydraulic residual pressure test. 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).
         5.2.8. Residual burst strength test
         The storage container undergoes a hydraulic burst test 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).
         5.3. Verification test for expected on-road performance (Pneumatic sequential tests)
         A hydrogen storage system shall not leak during the following sequence of tests, which are illustrated in Figure 3. Specifics of applicable test procedures for the hydrogen storage system are provided in Annex 3.

Figure 3
Verification test for expected on-road performance (pneumatic/hydraulic)

         5.3.1. Proof pressure test
         A system is pressurized to 150 per cent NWP (+2/-0 MPa) for at least 30 seconds (Annex 3, paragraph 3.1. test procedure). A storage container that has undergone a proof pressure test in manufacture may be exempted from this test.
         5.3.2. Ambient and extreme temperature gas pressure cycling test
         The system is pressure cycled using hydrogen gas for 500 cycles (Annex 3, paragraph 4.1. test procedure).
              (a) The pressure cycles are divided into two groups: Half of the cycles (250) are performed before exposure to static pressure (paragraph 5.3.3.) and the remaining half of the cycles (250) are performed after the initial exposure to static pressure (paragraph 5.3.3.) as illustrated in Figure 3;
              (b) The first group of pressure cycling, 25 cycles are performed to 80 per cent NWP (+2/-0 MPa) at  -40 °C, then 25 cycles to 125 per cent NWP (+2/-0 MPa) at  +50 °C and 95 (±2) per cent relative humidity, and the remaining 200 cycles to 125 per cent NWP (+2/-0 MPa) at
              20 (± 5) °C;
              The second group of pressure cycling, 25 cycles are performed to 125 per cent NWP (+2/-0 MPa) at  +50 °C and 95 (±2) 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