How to switch the oil feed sequence for different oil types in long-distance pipelines
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For a 45-kilometer-long DN250 pipeline used for transporting 97# and 93# gasoline in sequence, how should the lengths of the oil inlet section and the oil transmission section be calculated? What is the switch flag?
Reply to 1# shengchanbu7253: Theoretically, the blended fuel should be mixed into the lower-octane 93-octane gasoline, but this results in fuel loss. The usual practice is to use equal amounts of each type of fuel, which avoids such loss. As for the calculation of the blend ratio, one can refer to the book \"Design of Oil Pipeline Projects\" or relevant design specifications
Our approach is to insert an oil type with a significantly different density in between, but one that is insoluble in gasoline. In this way, the trend in density change is quite obvious, and switching is carried out based on these density changes.
In the gasoline/gasoline blend section, while ensuring a high quality for the higher-grade fuel, all the remaining blended fuel is incorporated into the lower-grade fuel.
The interface between gasoline and its blends is monitored using an octane tester; as long as the octane value is within the acceptable range, it’s fine, and any minor issues can be addressed before further blending takes place.