Document ID: chunk:federal_register_of_legislation:F2023L01530:body:0:p10
Version: federal_register_of_legislation:F2023L01530
Segment Type: other
Provision Reference: 
Character Range: 29200–32559

compressed hydrogen storage system
This part specifies the requirements for the compressed hydrogen storage system. The hydrogen storage system consists of the high pressure storage container and primary closure devices for openings into the high pressure storage container. Figure 1 shows a typical compressed hydrogen storage system consisting of a pressurized container, three closure devices and their fittings. The closure devices shall include the following functions, which may be combined:
         (a) TPRD;
         (b) Check valve that prevents reverse flow to the fill line; and
         (c) Automatic shut-off valve that can close to prevent flow from the container to the fuel cell or internal combustion engine. Any shut-off valve, and TPRD that form the primary closure of flow from the storage container shall be mounted directly on or within each container. At least one component with a check valve function shall be mounted directly on or within each container.

         Figure 1
         Typical compressed hydrogen storage system

All new compressed hydrogen storage systems produced for on-road vehicle service shall have a NWP of 70 MPa or less and a service life of 15 years or less, and be capable of satisfying the requirements of paragraph 5.
The hydrogen storage system shall meet the performance test requirements specified in this paragraph. The qualification requirements for on-road service are:
         5.1. Verification tests for baseline metrics
         5.2. Verification test for performance durability (hydraulic sequential tests)
         5.3. Verification test for expected on-road system performance (pneumatic sequential tests)
         5.4. Verification test for service terminating system performance in Fire
         5.5. Verification test for performance durability of primary closures.
The test elements within these performance requirements are summarized in Table 1. The corresponding test procedures are specified in Annex 3.
Table 1
Overview of performance requirements

5.1.    Verification tests for baseline metrics
5.1.1.  Baseline initial burst pressure
5.1.2.  Baseline initial pressure cycle life
5.2.    Verification test for performance durability (sequential hydraulic tests)
5.2.1.  Proof pressure test
5.2.2.  Drop (impact) test
5.2.3.  Surface damage
5.2.4.  Chemical exposure and ambient temperature pressure cycling tests
5.2.5.  High temperature static pressure test
5.2.6.  Extreme temperature pressure cycling
5.2.7.  Residual proof pressure test
5.2.8.  Residual strength Burst Test
5.3.    Verification test for expected on-road performance (sequential pneumatic tests)
5.3.1.  Proof pressure test
5.3.2.  Ambient and extreme temperature gas pressure cycling test (pneumatic)
5.3.3.  Extreme temperature static gas pressure leak/permeation test (pneumatic)
5.3.4.  Residual proof pressure test
5.3.5.  Residual strength burst test (hydraulic)
5.4.    Verification test for service terminating performance in fire
5.5.    Requirements for 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