A question about LNG storage tanks.
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I had some questions regarding the issues that occurred with the LNG in tank L during unloading, and I asked about them at the time, but I suddenly can’t remember why. I’ve come specifically to ask the teacher for advice. What I saw at that time was the temperature monitoring display of the LNG storage tanks on the DCS screen in the control room. (During unloading) At that time, the temperature of the liquid at the bottom layer was around -159.3°C, while the temperature of the BOG gas phase was about -159.6°C. I would like to ask why the temperature of the liquid at the bottom layer is higher than that of the gas phase Is it because of rapid evaporation?
Is it the pushing fluid used during unloading? The bottom part consists of the old LNG, while the top part contains BOG generated by the vaporization of the new LNG. Due to differences in their composition, it is possible for the temperature of the BOG at the top to differ from that of the LNG at the bottom