Practice questions on May 3, 2017; replies will earn 2–6 points (** no scoring after it is displayed, thank you for your replies
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The last edit to this post was made by percy on 2017-5-2 at 19:48. The options that can cause a decrease in vacuum level are: (ACD) A. High temperature of the cooling water in the tower top condenser and various condensation coolers, or low water pressure； B. The temperature at the top of the vacuum tower is controlled too low ； C. Increase in the outlet temperature of the vacuum furnace oil or change in the feed composition of the vacuum tower ； D. Fault in the steam ejector itself ；
A. High cooling water temperature or low water pressure in the tower top condenser and various stage condensation coolers； B. The temperature at the top of the vacuum tower is controlled too low ； C. Increase in the outlet temperature of the vacuum furnace oil or change in the feed composition of the vacuum tower ； D. Fault in the steam ejector itself ；