Ask X3What does 49 CFR 173.311 (Metal Hydride Storage Systems) require?
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Based on 49 CFR 173.311, transportable UN Metal hydride storage systems (UN3468) with pressure receptacles up to 150 liters (40 gallons) in water capacity and a maximum developed pressure of 25 MPa or less must meet the following requirements:
* Design and Testing: They must be designed, constructed, initially inspected, and tested in accordance with ISO 16111:2018, consistent with § 178.71(m). Alternatively, until December 31, 2026, they may conform to the older ISO 16111:2008(E) standard.
* Marking for Steel Liners: Steel pressure receptacles or composite pressure receptacles with steel liners must be marked per § 173.301b(f). This requires a steel UN pressure receptacle with an “H” mark if it is used for hydrogen-bearing gases or other gases that can cause hydrogen embrittlement.
* Requalification: They must be requalified at least every five years, following the procedures in ISO 16111:2018 or ISO 16111:2008 and as specified in § 180.207.