How should the volume of the zero-position tank be determined?
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I have a question: How should the volume of the zero-position tank be determined? For example, in the unloading of railway tank cars, if the effective volume of such a tank car is 50 cubic meters, what should be the volume of the tank at zero level?
The zero-position tank seems to be designed to drain all the oil from the pipeline!!!! The main thing to consider is the amount of oil stored in the pipeline!!! I’m not sure if this is correct; it’s just for reference!! :handshake :victory:
The zero-position tank seems to be designed to drain all the oil from the pipeline! As a result, the amount of oil stored in it is relatively small, and it is pumped using a separate submersible pump; usually, about 5 cubic meters is sufficient!
To improve unloading efficiency, the volume of the zero-position tank should be matched to the total amount of oil to be unloaded in one go. For details, refer to SH/T3107-2000 \"Design Code for Railway Loading and Unloading Facilities for Petrochemical Liquid Materials\".
The oil in the zero-level tank is pumped to the relevant storage tanks using a transfer pump; the zero-level tank serves as a buffer to prevent the pump from running dry. Therefore, the volume of the zero-position tank is related to the unloading speed and the conveying speed. When the unloading speed is greater than the conveying speed, its volume can be slightly smaller; otherwise, it needs to be slightly larger. It is generally necessary to ensure that the transfer pump will not run dry while operating normally within 30 minutes after oil unloading stops.