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Time：2025-04-27 11:26:03 Reading volume：
The filtration technology of turbine oil and hydraulic oil is crucial to the life and operating efficiency of equipment. Due to the different working environments and performance requirements of these two oils, their filtration technologies are also different. The following is a detailed comparative analysis:
Turbine oil (turbine oil) is mainly used in high-speed rotating equipment such as steam turbines and gas turbines, and must have excellent antioxidant, anti-emulsification and cleanliness.
1. Main pollutants
- Solid particles (metal wear particles, dust)
- Moisture (condensate or system leakage)
- Oxidation products (sludge, colloid)
(1) Mechanical filtration
- Filter element filter (precision 1-5μm)
- Used for daily maintenance to remove solid particles.
- Common materials: glass fiber, metal mesh.
- High-precision oil filter (precision ≤1μm)
- Used for ultra-clean systems, such as gas turbine lubrication systems.
(2) Vacuum dehydration filtration
- Removes water through negative pressure evaporation (can be reduced to below 50ppm).
- Suitable for turbine oil with high water content.
(3) Electrostatic adsorption filtration
- Electrostatic oil purifier
- Adsorbs tiny particles (0.1μm level) and colloids to extend the life of the oil.
(4) Coalescing separation technology
- Coalescing dehydration oil filter
- First, coalesce tiny water droplets, then separate and drain, suitable for turbine oil with severe emulsification.
- Online filtration: Install a high-precision filter element (β≥200) for continuous purification.
- Offline purification: Regularly use a vacuum oil filter for dehydration + electrostatic filtration.
Hydraulic oil is used to transmit power and requires high cleanliness (ISO 4406 standard), otherwise, it will cause valve jamming and pump wear.
1. Main pollutants
- Particle pollutants (metal chips, dust)
- Air (bubbles)
- Moisture (causing rust and oil oxidation)
2. Filtration technology
(1) High-pressure pipeline filtration
- High-pressure filter (installed at the pump outlet, precision 3-10μm)
- Protects precision components such as servo valves and proportional valves.
(2) Return oil filtration
- Return oil filter (with bypass valve, precision 10-25μm)
- Intercepts wear particles in the return oil of the system.
(3) Offline circulation filtration
- Oil filter trolley
- Used for regular maintenance, can be used with adsorbent (diatomaceous earth) to remove acidic substances.
(4) Vacuum dehydration
- Vacuum oil filter
- Suitable for hydraulic systems with excessive moisture (such as ship hydraulic oil).
(5) Magnetic filtration
- Magnetic filter element
- Adsorbs ferromagnetic particles, suitable for systems with a large amount of iron chips (such as forging equipment).
3. Recommended filtration solution
- Multi-stage filtration: high-pressure filter (main pump protection) + return oil filter (system cleaning).
- Regular inspection: Use a particle counter (such as ISO 4406) to monitor the cleanliness of the oil.
| Parameters | Turbine oil | Hydraulic oil |
|-------------------|-----------------------------|---------------------------|
| Key pollutants | Moisture, oxidation products, particles | Particles, moisture, air |
| Typical filtration accuracy | 1-5μm (high precision requirement ≤1μm) | 3-10μm (servo system requires ≤3μm) |
| Core filtration technology | Vacuum dehydration + electrostatic adsorption | High pressure filtration + magnetic adsorption |
| Cleanliness standard | ISO 4406 15/13/10 | ISO 4406 16/14/11 |
| Moisture control requirements | ≤100ppm (strict system ≤50ppm) | ≤500ppm (precision system ≤200ppm)|
1. Turbine oil system
- Preferentially choose a vacuum oil filter + electrostatic filtration combination.
- Regularly test the acid value (TAN) and moisture content.
2. Hydraulic system
- Use high pressure + return oil double-stage filtration, and the servo system requires a filter element with β≥200.
- Avoid using cellulose filter materials (easy-to-release fibers).
Through targeted filtration technology, the oil life can be significantly extended (turbine oil can reach more than 5 years, hydraulic oil more than 3 years), and the equipment failure rate can be reduced.
