How to Choose the Right Oil Purifier for Different Oil Types?

How to Choose the Right Oil Purifier Based on Oil Type and Performance Requirements

Selecting the correct oil purifier depends on oil type, contamination characteristics, and target purification performance. Different oils—such as transformer oil, turbine oil, and hydraulic oil—require different purification technologies due to their unique moisture sensitivity, gas content, and particulate contamination.

This guide provides a professional oil purifier selection framework based on oil quality and application.

1. Transformer Oil (Insulating Oil)

Transformer oil is highly sensitive to moisture and dissolved gases, both of which significantly reduce breakdown voltage (BDV) and insulation reliability.

Recommended Equipment

Vacuum oil purifier (dehydration and degassing type)

Selection Criteria

• Conventional voltage systems:
  Single-stage vacuum oil purifier

• High voltage / Ultra-high voltage systems (≥110 kV):
  Double-stage vacuum oil purifier for enhanced degassing and moisture removal

Target Performance Indicators

• Moisture content: ≤3 ppm

• Breakdown voltage (BDV): ≥70 kV

• Dissolved gas removal to improve dielectric strength and transformer safety

2. Turbine Oil (Steam and Gas Turbines)

The primary challenges with turbine oil are high water content, emulsification, and oxidation, which affect lubrication performance and bearing protection.

Recommended Equipment

Vacuum oil filtration system with enhanced demulsification capability

Key Performance Indicators

• High demulsification efficiency

• Rapid water separation and clarification

• Restoration of oil transparency and lubricating performance

This type of system ensures reliable long-term turbine operation and reduces unplanned downtime.

3. Lubricating Oil and Hydraulic Oil

Lubricating and hydraulic oils typically feature high viscosity and contain fine solid contaminants, such as metal wear particles and resin-coated debris generated during mechanical operation.

Recommended Equipment

• Tower-type precision oil filtration system, or

• Multi-stage integrated oil filtration system

Key Performance Indicators

• Filtration accuracy: 1 μm, 3 μm, or 5 μm, depending on system tolerance

• Effective removal of fine wear particles

• Improved hydraulic component lifespan and system reliability