Regarding reprocessed oil
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Currently, there are three pipelines branching off from the outlet of the re-refining pump: one leads to the large lift column, another leads to the small lift column, and the third is the pipeline coming from the diesel pump outlet (all of these pipelines are DN40). The question is: are these three pipelines used to re-refine diesel during production?
I guess the third circuit is used to adjust the diesel distillation range. When the diesel is too light, some reprocessed oil can be added to it. First, it can increase the diesel boiling range; second, it can boost the diesel yield slightly; third, it can also indirectly control the liquid levels in the distillation tower and the re-refining tank.
I guess the third route is for diesel reprocessing, used when reducing diesel production. As for where you mentioned the inlet to the large and small lift pipes is?