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 …
If liquid hydrogen usage is sufficiently high at the fueling station, there may be no need to vent any boiloff generated from the LH2 storage tank. Boil-off gas should be minimized through system design, but where needed, the boil-off hydrogen along with any other hydrogen released must be vented through a local vent stack which is constructed to safely vent the hydrogen in accordance with CGA…
Double pipes can be used in certain circumstances to reduce the likelihood of external leaks and increase
the likelihood of detection by monitoring the space between the two pipes. Vacuum jacketed piping is
double walled and is used in liquid hydrogen service to provide insulation. While not equipped with gas
detection in the annular space, loss of vacuum is used to indicate an…
The primary safety standards for applicable to this piping in the U.S. are ASME B31.3, B31.12, and NFPA 2. The editions used should be those adopted by the local jurisdiction. Design of an LH2 piping system should always be conducted and reviewed by engineers experienced in cryogenic piping design. The equipment should also be installed per NFPA 2 and NFPA 55. IT is recommended that the piping…
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