How to Choose the Right Oil Purifier: A Simple 3-Step Guide

Choosing an oil purifier isn’t about brand or price—it’s about matching the filter to your oil and your goals. If you start with the wrong choice, every step afterward can be wasted. Here’s a clear three-step process to guide you:

Core Process: Define Needs → Match Technology → ｓｅｌｅｃｔ Equipment

 Step 1: Define Your Core Needs

This is the foundation. Ask yourself three key questions:

 1. What type of oil are you filtering?

 Insulating oil (transformer, circuit breaker): Needs deep dehydration, degassing, and particle removal to restore dielectric strength.

 Lubricating oil (hydraulic, gear, turbine, engine): Requires water and impurity removal to maintain lubrication and cleanliness.

 Fuel oil (diesel, heavy fuel): Needs moisture and impurity removal to protect injectors and prevent corrosion.

 Specialty oil (synthetic, cutting fluid): Requires compatible filter media for its unique properties.

 2. What contaminants are present?

 Moisture: Free water (visible) vs. dissolved/emulsified water (invisible).

 Solid particles: Dust, metal shavings, carbides, etc. Target cleanliness levels (e.g., NAS 10 → NAS 6).

 Air/gas: Bubbles or dissolved gases that reduce performance.

 Chemical contaminants: Acids, sludge, oxidation products.

 3. What’s the purification goal?

 Online maintenance: Keep oil quality stable without downtime.

 Offline regeneration: Restore degraded oil to near-new standards.

 Specific targets:

   Transformer oil: Raise breakdown voltage from 30 kV → 50+ kV.

   Hydraulic oil: Improve cleanliness from NAS 10 → NAS 6.

Step 2: Match Technology to Your Needs

Different problems require different solutions.

Moisture Removal

Vacuum separation: Ideal for dissolved/trace water in insulating or turbine oil. Uses low-pressure evaporation.

Coalescing separation: Best for free/emulsified water in fuels and lubricating oils.

Particle Removal

Precision filtration: Filter elements rated 1–100 μm, chosen based on cleanliness goals.

Gas Removal

Vacuum degassing: Removes bubbles and dissolved gases to stabilize performance.

Chemical Contaminant Removal

Adsorption/regeneration: Materials like silica gel or activated alumina absorb acids, sludge, and oxidation byproducts.

Most advanced oil purifiers combine methods—e.g., vacuum + precision filtration or coalescing + filtration.

Step 3: ｓｅｌｅｃｔ Equipment Parameters

Once you know your oil and technology path, consider equipment details:

1. Flow rate (L/min) – Typically 1–2x the tank volume per hour.

2. Vacuum and temperature – Higher vacuum + proper heating = efficient dehydration.

3. Filtration fineness – Selectable micron ratings for precision.

4. Automation – Options include PLC touchscreen, automatic liquid level control, online moisture sensors, and backwashing.

5. Safety features – Explosion-proof controls, overload/overpressure protection.

6. Mobility & materials – Stationary or portable? Carbon steel or stainless steel for corrosion resistance?

7. Brand & service – Once technical needs are met, choose a reputable brand with reliable after-sales support.

Final Takeaway

Choosing the right oil purifier is a systematic process:

1. Define your needs.

2. Match the right technology.

3. ｓｅｌｅｃｔ equipment with the right parameters and support.

By following this method, you’ll ensure clean, reliable oil, longer equipment life, and better long-term performance.