清罐作业是油库一项经常性的工作，具有较大的危险性。
The operation of tank cleaning is a regular work in oil tank farm with danger.
介绍了油罐清罐的类型，论述了油罐清罐的常见风险，并对其进行了分析，同时提出了相应的防范措施。
This paper introduces the types of tank cleaning. Then, some normal cleaning hazards are discussed and analyzed. Some prevention measures are provided according to the hazards.
COW清洗工艺是通过临时敷设的循环系统，采用与待清洗油罐中油品相同的清洁油，循环冲洗、溶解，达到清罐的目的。
COW washing technology is adopting through temporary laid circulatory system and adopting identical clean oil, circulating to wash, to dissolve, reach the purpose of clearing tank.
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