Analysis on the Fire Accident of Hydrocracking Unit

A fire accident occurred in an oil refinery in north China. The on-site investigations proved that the fire was triggered by the leakage of tail oil from one hole on the pipeline. The detailed analysis of the metallurgical microstructure of related pipelines indicated that some micro-cracks existed in the pipeline. Under the action of tensile stress induced by inner pressure, one of the micro-cracks kept propagating and evolved into macro-crack; under the action of cyclic circumferential tensile stress and stress concentration in the crack tip, the macro-crack was transformed to penetrated crack, finally the crack was torn open by inner pressure, and then the leakage hole on the pipeline was formed and fire accident occurred.     

一起TNT碱性废水沉淀池火灾事故分析

某化工厂TNT碱性废水沉淀池在清理过程中发生了火灾事故,在现场调查的过程中,从附着在沉淀池上的可燃物成分入手,详细分析了造成此次火灾事故的主要原因,并在假定附着在池壁及立柱上的红棕色物质为纯TNT和事故中TNT为等容、绝热燃烧的前提下,计算出了事故中TNT燃烧的最高温度及最大压力.对类似工程中的防火防爆工作提供参考.