Comportement au feu de réservoirs entièrement composites destinés au stockage de gaz à très haute pression

Abstract : High-pressure full composite cylinders are a practical solution aiming at containing high pressure gases (up to 700 bar or even more) at an affordable cost and weight. Since they are not expected to resist in a large fire and may burst, they may be equipped with a TPRD (Thermally activated Pressure Relief Device). These devices are designed to release the internal content of the reservoir once a preset temperature is surpassed. When the gas is flammable, like hydrogen for which this full composite reservoir+TPRD technology is more specifically designed, the activated release may produce a very hazardous jet flame to protect them from fire. In the event of a fire, the TPRD prevents the cylinder from bursting by detecting high temperatures and releasing the pressurized gas. The current safety performance of both the vessel and the TPRD is demonstrated by an engulfing bonfire test. However, experience shows that totally unacceptable jet flames may results (up to 11 m long for a 40 l reservoir...). The objectives of this research were to investigate the behaviour of isolated full composite reservoirs (without TPRD) engulfed in a fire and to select the appropriate TPRD size as to obtain an efficient but yet safe release. A major finding is that those reservoirs may leak in a diffuse manner without bursting if the internal pressure is not too high. Following a much smaller TPRD could be used for which the jet flame length becomes tolerable.
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Christophe Proust. Comportement au feu de réservoirs entièrement composites destinés au stockage de gaz à très haute pression. Rapport Scientifique INERIS, 2013, 2012-2013, pp.16-17. ⟨ineris-01869451⟩

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