FCEVs usually contain only a minimal amount of hydrogen fuel pressure (several Mpa) to support getting the car on and off car carriers. Panel members are not aware of any hydrogen release incidents during vehicle loading and don’t know what the probability of such a leak is considering the loading operations. A risk assessment accounting for the probability of collisions as well as leaks from…
It’s not clear if “mobile” in the question refers to vehicle fuel tanks, or vessels used for transportation of hazardous materials.
The HSP is not familiar with this particular fitting or its potential application in H2 service but can offer engineering judgment. Many similar compression-type swaged fittings are used in H2 service. These fittings must be used within the manufacturer recommendations for pressure, temperature, and fluid service. Deformation is also introduced into stainless steel tubing in other ways, such…
The Panel considers two approaches to be acceptable.
The HSP is not aware of any immediate provisions in the IFC or CFC specific to maritime hydrogen fueling, but it would make sense for it to be addressed in either IFC Section 2309, Section 2310, or referenced in both. In NFPA 2, the HSP has not seen any proposals to date; however, anyone who sees a need is encouraged to submit language during the Public Input stage. For example, extensive…
Neither section is a perfect fit for marine hydrogen fueling, but that is often the case with applying Codes. The most prudent approach is to draw from the most relevant provisions of both CFC Sections 2309 and 2310, disregarding requirements that clearly do not align with marine fueling practices. For example, CFC Section 2309 requires a vehicle to be parked on a concrete fueling pad—…
The HSP is not aware of any specific standards for this application, but LNG standards could serve as a useful starting point given the extensive maritime trade of LNG and its use in ship propulsion. Meeting LNG requirements could provide a minimum baseline, with additional considerations needed to account for the colder temperatures of liquid hydrogen (e.g., purging, air liquefaction,…
This is a complex and sometimes contentious topic. The International Code Council (ICC) addresses hydrogen piping in the …
Generally speaking, the International Fire Code and NFPA 2 apply to non-transportation use of hydrogen. These are maturing quickly, with NFPA 2 currently having issued its most recent edition in 2023. Standards for both on-board LH2 tanks and LH2 tankers for bulk fuel transport are managed by the U.S. Department of Transportation (DOT) and are well established. DOT transport requirements for…
Hydrogen gas storage and fuel cell systems are typically closed systems with a variety of monitoring and control functions to prevent leaks. Please check with the bus manufacturer and authority having jurisdiction to verify this is acceptable per their direction. However, a good safety practice would be to minimize the time spent indoors for these activities. Hydrogen vehicles maintained in a…
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