Turbine Oil Viscosity Filtration Standards

The viscosity filtration standard of turbine oil (turbine oil) is an important indicator to ensure the cleanliness of oil products and maintain the normal operation of equipment. The following are the key points:

1. The relationship between viscosity and filtration

- Viscosity effect: The viscosity of turbine oil (usually ISO VG 32, 46, 68, etc.) will affect the filtration efficiency. High-viscosity oil requires higher pressure or preheating (traditionally heated to 40-60℃) to reduce viscosity and improve filtration effect.

- Filtration temperature: It is recommended to filter at an oil temperature of 50-60℃, when the viscosity is moderate and impurities are easier to remove.

2. Cleanliness standard (ISO 4406)

The cleanliness of turbine oil is usually required to meet the following requirements:

- New oil: ≤ISO 16/14/11 (NAS grade 6).

- Operating oil: ≤ISO 18/16/13 (NAS grade 8), which is adjusted according to the requirements of the equipment manufacturer.

3. Filtration accuracy

- Main system filtration: β₅≥200 is recommended (filtration accuracy ≤5μm, efficiency ≥99.5%).

- Bypass filtration: 1-3μm high-precision filter element can be selected for deep purification.

4. Moisture and impurity control

- Moisture: should be <100ppm (high-pressure units have stricter requirements, such as <50ppm).

- Particles: need to be tested regularly to avoid excessive metal wear particles (such as iron and copper).

5. Maintenance recommendations

- Regular testing: monitor viscosity, moisture, and particle contamination every 3-6 months.

- Filter element replacement: ｒｅｐｌａｃｅ when the pressure difference exceeds 0.2MPa or the pollution alarm is triggered.

- System design: adopt the combination of "main system + bypass precision filtration" to improve efficiency.

6. Reference standards

- ISO 4406: Particle contamination classification.

- ASTM D4378: Guidelines for Controlling Turbine Oil Contamination.

- Manufacturer standards, such as those from GE and Siemens, may have specific requirements.

Note: The specific standards need to be adjusted according to the unit type (such as gas turbine, steam turbine), operating conditions (high temperature, high load) and oil formulation. It is recommended to refer to the equipment manual or industry specifications.