Can the oil purifier filter out the water?

Whether the oil purifier can filter water depends on its type and technical principle. Here is a detailed answer:

1. Types of oil purifiers that can filter water

- Vacuum oil purifier: By heating the oil and evaporating the water in a vacuum environment, it can efficiently remove free water, emulsified water and even trace water (up to ppm level), suitable for transformer oil, lubricating oil, etc.

Centrifugal oil purifier: This device uses centrifugal force to separate water (density greater than oil). It is suitable for treating large amounts of free water, which is common in industrial waste oil treatment.

Coalescing separation oil purifier: Small water droplets are coalesced through hydrophilic materials, and then the water is discharged through the separation layer. It is suitable for fuel, hydraulic oil, etc.

- Adsorption oil purifier: Use desiccant (such as silica gel, molecular sieve) to absorb water, suitable for trace water removal, but the adsorption medium needs to be replaced regularly.

2. Oil purifiers that cannot effectively remove water

- Ordinary mechanical filters: can only filter solid impurities, cannot separate water.

- Some simple filter devices: designed for particulate filtration, no water removal function

3. Key influencing factors

- Water form: free water (easy to remove) vs dissolved water (needs vacuum or heating).

- Oil type: Lubricating oil and insulating oil have different treatment requirements (e.g. transformer oil needs to be dried to ≤ 10 ppm).

- Temperature and vacuum: high temperature (60-70℃) and low vacuum (≤50Pa) improve dehydration efficiency.

4. Application scenario suggestions

- Industrial lubricating oil: choose vacuum or coalescing type, target water content ≤100ppm.

- Insulating oil: must use vacuum oil purifier to reach ≤10ppm (IEEE 62 standard).

- Fuel oil: coalescing oil purifier can be processed to the ASTM D975 standard (water content ≤0.05% by volume).

5. Maintenance points

- Regularly check the status of the filter element/adsorbent.

- Monitor the water content of the outlet oil (can be tested by the Karl Fischer method).

- The vacuum pump and heating system of the vacuum oil purifier need to be maintained.

Conclusion: Professional oil purifiers (such as vacuum and centrifugal) can effectively remove water, but the appropriate equipment should be selected according to the oil type, water content and treatment standards. Ordinary filters cannot remove water, so the technical parameters must be clearly stated when purchasing.