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32 1975年8月17日美国宾夕法尼亚州费城(Philade1phia),事件损失1300万美元,趋向损失2650万美元。 1艘油轮正将原油卸入炼油厂1座改装的9500m~3内浮顶油罐。有迹象表明,在初始着火爆炸时,油罐实际上未溢流,但油已超过最大装油高度,导致挥发性蒸气迅速从罐排气孔排出。蒸气漂浮到锅炉房,被那里1条未保温的高温高压蒸汽管道的热表面点燃,引起锅炉房烟囱的瞬时超压而遭彻底毁坏,
32 In Philadelphia, Pennsylvania, United States, August 17, 1975, the incident suffered a loss of $ 13 million and a loss of $ 26.5 million. A tanker is unloading crude oil into a refurbished 9500m ~ 3 floating roof tank. There are indications that at the time of the initial fire explosion, the tank did not actually overflow, but the oil exceeded the maximum fill level, causing volatile vapors to quickly drain through the tank vent. The vapor floats into the boiler room and is ignited by the hot surface of an unheated high temperature and pressure steam pipe there, causing instantaneous overpressure in the boiler room chimney which is completely destroyed.