Safety approach for composite pressure vessels for road transport of hydrogen. Part 1: Acceptable probability of failure and hydrogen mass |
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Authors: | Kaspar Lasn Andreas T Echtermeyer |
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Affiliation: | Composites and Polymers, Department of Engineering Design and Materials, Norwegian University of Science and Technology, Richard Birkelandsvei 2B, N-7491 Trondheim, Norway |
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Abstract: | Hydrogen is a promising alternative for current energy carriers. Compressed gas cylinders are the storage systems closest to the commercialization of hydrogen in vehicles. The safety factors in current standards are seen as restrictive for further growth and competitiveness of hydrogen infrastructure. A probabilistic approach can be employed in order to give a rational background to the safety factors. However, an acceptable probability of failure needs to be estimated before calculating the safety factors. The discussion of determining the acceptable probability must include the mass of hydrogen since this determines the consequences of an accident. It is concluded that an annual probability of failure of 10−7 would be appropriate for small pressure vessels containing a few kilograms of hydrogen. Larger pressure vessels of a few hundred kilograms or more should be designed for an annual probability 10−8. |
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Keywords: | Composite pressure vessel Hydrogen mass Acceptable probability of failure |
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