Some issues arose during the pipeline purging at the start of operations; I hope to get some answers
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At the beginning of operation, the factory was purging the pipelines and introducing purified air for instrument calibration. When the air was first introduced, water was detected in the drain from the bottom of the tank; therefore, the outlet at the top of the tank was closed to allow water to be removed from the bottom of the tank. For about an hour, LZ went to do other tasks, and when he returned, there was no more water in the drain from the bottom of the tank. At that point, the inlet valve for the purified air was closed. Then something amazing happened: frost formed on the outer wall of the drain, and in some areas, ice formed from frozen water droplets. I wonder what the principle behind this is
The temperature of the purge air is low, while the outdoor temperature is high. Similar to an outdoor unit for air conditioners
Frost can form even in the middle of summer – how low must the temperature be? It shouldn’t be too low; at least the temperature of the air coming out of the vents isn’t cold enough to freeze your hands. In fact, when I conducted further experiments by opening the inlet valve for the purified air, the surface of the condensate drain pipe was warm as well.
Such situations have occurred when liquefied gas was released into the flare system. When air is used for venting, condensation water may form on the outer surface at most; this can happen when the outside temperature is high and the air humidity is high. However, the temperature of the air generally does not drop below that of the atmosphere