 | 1、当罐1或罐2清洗完毕,阀门处于开启状态,而罐3开始清洗时污水可能对罐1、罐2形成2次污染;; When the tank 1 or tank 2 is cleaned, the valve is in an open state, andsewage may pollute the tank 1 or tank 2 twice when the tank 3 starts cleaning.
2、当罐处于负压状态时,极易从密封不良阀门吸入排放管道的污染物质; When the tank is under negative pressure, it is easy to suck pollutants from the discharge pipeline from the poorly sealed valve.
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