How to choose industrial oil filtration equipment?

When selecting industrial oil filtration equipment, factors such as oil characteristics, pollution type, processing volume and cleanliness requirements must be considered comprehensively. The following is a systematic selection guide to help you accurately match your needs:

Clarify the core goal of filtration

1. Removal object

- Solid particles (metal chips, dust)

- Water (free water/emulsified water)

- Colloid/sludge (oxidation products)

- Gas (dissolved air)

2. Cleanliness standard

- Refer to ISO 4406 (particle count) or NAS 1638 (such as hydraulic systems often require NAS level 7 or below)

- Water requirements (such as transformer oil ≤50ppm)

Key selection parameters

| Parameters | Considerations | Examples |

|----------------|-----------------------------------------|----------------------------------|

| Oil type | Viscosity (high viscosity oil needs to be heated), chemical compatibility | Phosphate ester hydraulic oil requires fluoro rubber seals |

| Flow rate | Continuous treatment selects online filtration, intermittent treatment selects offline | 200L/min system needs to match flow oil filter |

| Pollution degree | Initial pollution level (number of particles, water content) | Emulsified oil containing 10% water needs to be coalesced and separated |

| Working environment | Explosion-proof requirements (petrochemical plants), temperature range (extremely cold regions) | Marine equipment must comply with IMO standards |

Equipment selection comparison table

| Pollution type | Recommended equipment | Accuracy/effect | Applicable scenarios |

|--------------------|---------------------------|----------------------------------|---------------------------|

| Solid particles | Filter element filter | 1~100μm (absolute filtration optional) | Hydraulic system, gearbox |

| Water + particles | Vacuum oil filter | Water ≤50ppm, particles ≤5μm | Transformer oil, turbine oil |

| Emulsified oil | Coalescing oil filter | Water content after demulsification ≤100ppm | Cutting fluid, rolling oil |

| High viscosity oil | Centrifuge + heating device | Separation efficiency ≥ 95% | Gear oil, asphalt oil |

| Trace colloid/oxide | Activated clay adsorption tower | Acid value reduction of more than 50% | Regeneration of old lubricating oil |

Step-by-step selection process

1. Detect oil status

- Use pa article counter, moisture meter, and acid value test to determine the type and degree of contamination.

2. Determine the processing volume

- Online filtration: flow rate ≥ 1.5 times the system circulation volume (e.g. hydraulic system 100L/min, ｓｅｌｅｃｔ 150L/min oil filter truck)

- Batch processing: ｓｅｌｅｃｔ according to the tank capacity (e.g. 5 tons of oil tank, ｓｅｌｅｃｔ 500L/h processing capacity equipment)

3. ｓｅｌｅｃｔ filtration technology combination

- Example: high moisture + high particle contamination → centrifuge (remove large particles) → vacuum oil filter (dehydration) → precision filtration (1μm)

4. Verify compatibility

- Oil resistance of filter material (e.g. nitrile rubber is not suitable for ester oil)

- Heating temperature limit (silicone oil should not exceed 80℃)

Industry application cases

1. Wind power gearbox

- Requirement: Remove 20μm metal wear debris + moisture control ≤500ppm

- Solution: Magnetic filter + coalescing dehydration oil filter (with moisture sensor)

2. Injection molding machine hydraulic system

- Requirement: NAS Cleanliness level 7 (ISO 18/16/13)

- Solution: high-pressure filter element (5μm) with β≥200 + circulating filtration system

3. Marine diesel engine oil

- Requirement: IMO MEPC.107(49) emission standard

- Solution: disc centrifuge + 15ppm oil-water separator

Pitfall avoidance guide

1. Avoid over-filtration

- Excessive dehydration of turbine oil may cause loss of additives, and the vacuum degree needs to be controlled.

2. Maintenance cost accounting

- Filter element equipment has high consumables cost, and centrifuge maintenance frequency is low but energy consumption is high.

3. Anti-counterfeit equipment

- Verify the equipment CE and ISO 9001 certification, and be wary of false flow parameters.

Provide specific oil products (such as refrigeration oil, and quenching oil) and pollution data, and we can customize the filtration solution for you!