Catalytic cracking diesel pump evacuation
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The book states that high temperatures in the middle section of the fractionation tower can cause the diesel pump to experience vacuum conditions. Is this because high temperatures in that middle section cause the diesel to vaporize, thereby leading to vacuum in the diesel pump? It is also said that a low temperature in the middle section can cause the diesel pump to lose pressure – why is that?
High is due to the absence of a liquid phase on the tray, and low is due to the tendency to carry water. Both can cause the pump to experience vacuum!