Navigating Unfamiliar Territory—US Hydrogen Safety Regulations and European Standards
Center for Hydrogen Safety Conference Europe
Tuesday, May 9, 2023 - 10:30am to 10:45am
European manufactures, developers and engineers looking to reach US customers may face an unfamiliar regulatory and standards regime. In our presentation, we will provide a brief overview of key US government regulators for safe handling of hydrogen. We will also review relevant US standard organizations with which Europeans designers may not be familiar, including ASME, NFPA, and CGA.
A more in-depth case study compares the European and US standards for the design of deflagration vents, EN 14994 and NFPA 68. Deflagration vents are an established technique for preventing catastrophic explosions and enclosure failures after a flammable fuel-air mixture is ignited. Sizing these devices for hydrogen presents a unique challenge due to hydrogenâs combustion properties including a fundamental burning velocity that is almost 10 times higher than more conventional hydrocarbon fuels. Burning velocity and KG (deflagration index for gases) are important parameters when sizing deflagration vents. The high burning velocity, and corresponding high KG, of hydrogen can limit the effectiveness of explosion vents to mitigate hydrogen explosions. In this paper, we will compare these different approaches for sizing such devices, namely NFPA 68 and EN 14994 for several case studies.
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