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 …
These distances are based primarily on hydrogen piping releases and resultant vapor clouds and jet flames based on pipe diameter and pressure. It’s important to note that many facilities have issues such as confinement and congestion, so it may be applicable to apply contemporary engineering models to assess risk.
There is technically no upper limit for GH2 storage listed within the separation distance tables within Chapter 7 of NFPA 2. For LH2, there is a 75000-gallon upper limit for the LH2 storage separation distance tables within Chapter 8 for LH2.
It’s important to note that many facilities have site specific issues such as large quantities, confinement, and congestion, so it may be…
The Global Asset Protection Services (GAPS) standard was written 20 years ago for property loss prevention at crowded chemical plants and is intended for existing and new oil and chemical facilities to limit explosion over-pressure and fire exposure damage; thus, the purpose is different than NFPA 2. NFPA distances were based on studies from the 1960s as well as qualitative factors that were…
Previous versions of NFPA 55 listed overhead power lines within the separation distance tables with no voltage distinction. The separation distances were 15 ft for GH2 and 25 ft for LH2 for all overhead electrical lines. The current edition of NFPA 2 includes these in overhead utilities; the distance for GH2 and LH2 will vary with pressure and diameter of the hydrogen piping. In practice, high…
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