According to analysis on the structure importance of fault tree, the countermeasures to prevent grain dust explosion are put forward and the concrete prevention measures are also presented.
通过事故树的结构重要度分析，提出了预防粮食粉尘爆炸事故的对策，同时给出了具体的预防措施。
Through test analysis, we found that it is caused by the large size grain in this section, as well as the structure stress in this section over the material strength.
经试验分析是由于该段晶粒粗大，淬火时组织应力超过该段的材料强度所致。
In accordance with downhole tubing sticking by sand burial accident, this paper proposes hollow rod sand washing after analysis of downhole string structure and hydraulic calculation of sand grain.
针对处理井下油管砂埋遇卡事故作业中出现的技术问题，在分析井下管柱结构及砂粒的水力计算的基础上，提出了空心抽油杆冲砂工艺处理措施。
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