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.

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。

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The return sewage of oil refining using in system of circulating cooling water as supplying water was studied.

对炼油污水作为循环冷却水的补充水回用于循环冷却水系统进行了研究。

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Because of the quick change and unexpected stop of the circulating direction of oil liquid, the machine tool hydraulic system will produce pressure impact.

机床液压系统由于油液流动方向迅速改变或突然停止流动，产生压力冲击。

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