Document ID: chunk:federal_register_of_legislation:F2023L01530:body:0:p11
Version: federal_register_of_legislation:F2023L01530
Segment Type: other
Provision Reference: 
Character Range: 32214–35261

primary closure devices

         5.1. Verification tests for baseline metrics
         5.1.1. Baseline initial burst pressure
         Three (3) containers shall be hydraulically pressurized until burst (Annex 3, paragraph 2.1. test procedure). The manufacturer shall supply documentation (measurements and statistical analyses) that establish the midpoint burst pressure of new storage containers, BPO.
         All containers tested shall have a burst pressure within ±10 per cent of BPO and greater than or equal to a minimum BPmin of 225 per cent NWP.
         In addition, containers having glass-fibre composite as a primary constituent to have a minimum burst pressure greater than 350 per cent NWP.
         5.1.2. Baseline initial pressure cycle life
         Three (3) containers shall be hydraulically pressure cycled at the ambient temperature of 20 (±5) °C to 125 per cent NWP (+2/-0 MPa) without rupture for 22,000 cycles or until a leak occurs (Annex 3, paragraph 2.2. test procedure). Leakage shall not occur within 11,000 cycles for a 15-year service life.
         5.2. Verification tests for performance durability (Hydraulic sequential tests)
         If all three pressure cycle life measurements made in paragraph 5.1.2. are greater than 11,000 cycles, or if they are all within ± 25 per cent of each other, then only one (1) container is tested in paragraph 5.2. Otherwise, three (3) containers are tested in paragraph 5.2.
         A hydrogen storage container shall not leak during the following sequence of tests, which are applied in series to a single system and which are illustrated in Figure 2. Specifics of applicable test procedures for the hydrogen storage system are provided in Annex 3, paragraph 3.

Figure 2
Verification test for performance durability (hydraulic)

         5.2.1. Proof pressure test
         A storage container is pressurized to 150 per cent NWP (+2/-0 MPa) and held for at least 30 sec (Annex 3, paragraph 3.1. test procedure).
         5.2.2. Drop (impact) test
         The storage container is dropped at several impact angles (Annex 3, paragraph 3.2. test procedure).
         5.2.3. Surface damage test
         The storage container is subjected to surface damage (Annex 3, paragraph 3.3. test procedure).
         5.2.4. Chemical exposure and ambient-temperature pressure cycling test
         The storage container is exposed to chemicals found in the on-road environment and pressure cycled to 125 per cent NWP (+2/-0 MPa) at 20 (±5) °C for 60 per cent number of Cycles pressure cycles (Annex 3, paragraph 3.4. test procedure). Chemical exposure is discontinued before the last 10 cycles, which are conducted to 150 per cent NWP (+2/-0 MPa).
         5.2.5. High temperature static pressure test.
         The storage container 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