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Metallurgical Failure analysis of a propane tank boiling liquid expanding vapor explosion (BLEVE)

机译:丙烷罐沸腾液体膨胀蒸汽爆炸冶金故障分析(睑板)

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A severe fire and explosion occurred at a propane storage yard in Truth or Consequences, N.M., when a truck ran into the pumping and plumbing system beneath a large propane tank. The storage tank emptied when the liquid-phase excess flow valve tore out of the tank. The ensuing fire engulfed several propane delivery trucks, causing one of them to explode. A series of elevated-temperature stress-rupture tears developed along the top of a 9800 L (2600 gal) truck-mounted tank as it was heated by the fire. Unstable fracture then occurred suddenly along the length of the tank and around both end caps, along the girth welds connecting the end caps to the center portion of the tank. The remaining contents of the tank were suddenly released, aerosolized, and combusted, creating a powerful boiling liquid expanding vapor explosion (BLEVE). Based on metallography of the tank pieces, the approximate tank temperature at the onset of the BLEVE was determined. Metallurgical analysis of the ruptured tank also permitted several hypotheses regarding BLEVE mechanisms to be evaluated. Suggestions are made for additional work that could provide improved predictive capabilities regarding BLEVEs and for methods to decrease the susceptibility of propane tanks to BLEVEs.
机译:当一辆卡车跑进一个大型丙烷坦克下方的卡车跑进泵送和管道系统时,在真相或后果的丙烷储存码处发生了严重的火灾和爆炸。当液相过量流动阀门撕出罐时,储罐清空。随后的火焰吞没了几辆丙烷送货卡车,导致其中一个爆炸。沿着9800 L(2600 Gal)卡车安装罐顶部开发的一系列升高的温度胁迫破裂撕裂,因为它被火加热。然后沿着罐的长度和两个端盖沿着将端盖连接到罐的中心部分的周围焊缝突然发生不稳定的骨折。坦克的剩余内容突然释放,雾化和燃烧,产生强大的沸腾液体膨胀蒸汽爆炸(BLEVE)。基于罐件的金相,测定了睑发出的近似罐温度。破裂罐的冶金分析还允许有关要评估的抗睑机制的几个假设。建议是为额外工作提供的,可以提供有关抛弃的改进的预测能力,并用于降低丙烷罐倾向于钻孔的易感性。

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