Why is the re-refining pump evacuating?
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Can’t refill the pump with crude oil?
Here’s an example for reference! The bottom temperature of the re-refining tank for this unit is 319, while the temperature of the feedstock after preheating is 215! The original material is reintroduced into the reprocessing tank; if a large amount is added, a sudden drop in the temperature at the bottom of the reprocessing tank can cause the reprocessing pump to experience vacuum conditions! It is mainly caused by the low temperature of the raw materials.
The crude oil can be directly fed into the re-refining tank.
Be careful about dehydration; it happens frequently, remove all the water – just do it a few times and it will be fine.
An excessive amount of seal oil injection or the presence of water can also easily cause the re-refining pump to experience cavitation.