The refinement of oil machinery typically involves several key steps:

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1. Initial filtration: This is the first stage where impurities and contaminants in the raw oil are removed using filters or centrifuges.

2. Degassing: Oil containing dissolved gases must be degassed to remove these gases before refining. This can be done through vacuum distillation or other methods.

   

3. Cracking: The refined oil may undergo cracking processes to increase its octane number (for gasoline) or improve its properties for specific applications.

4. Catalytic reforming: In some cases, catalytic reforming can be used to enhance the properties of the oil, such as increasing its anti-knock properties for diesel fuel.

5. Final filtration: After any additional processing stages, final filtration is carried out to ensure that there are no remaining contaminants or particles in the refined oil.

   

6. Quality control testing: Throughout this process, quality control tests are performed to ensure that the refined oil meets the required specifications for its intended use.

7. Packaging and storage: Once the oil has been refined and tested, it will be packaged into suitable containers and stored until it's ready for distribution or use.

Each step plays a crucial role in ensuring the quality and performance of the final product, which could range from automotive fluids to industrial lubricants.