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Chemical pump extension of life - the correct choice of lubricating oil
Chemical Pump Life Extension Method – Choosing the Right Lubricant
Proper lubrication is crucial for extending the life of chemical pumps. To ensure effective lubrication, four key conditions must be met:
1. The formation of a sufficient hydrodynamic oil film to reduce friction and wear.
2. The development of a strong boundary film that protects surfaces under high load or extreme conditions.
3. Clean lubricating oil free from contaminants that could cause damage.
4. An adequate and consistent supply of lubricant to maintain performance over time.
The effective lubrication period refers to the time during which the lubricant continues to perform reliably under normal operating conditions. If signs of abnormal wear appear—such as oxidation, aging, or degradation—it indicates that the lubricant is nearing the end of its useful life.
Visual inspection is an essential part of assessing lubrication quality. For oil-lubricated bearings:
- If the bearing surface shows scum or a thin film, it may indicate overheating due to poor lubrication.
- If there is no visible oil residue, the temperature is likely at or near the oil’s upper limit.
- If the bearing appears dry with a foggy surface, it suggests that the lubricant has reached the end of its effective life.
For grease-lubricated bearings:
- Black, oily grease may mean the load exceeds the grease's capacity.
- White, spongy grease could result from air bubbles or over-inflation.
- A uniform blue-black, dry appearance indicates that the grease has lost its effectiveness.
- Hard outer layers with a soft interior suggest exposure to external heat, while a uniformly hard consistency may signal burning caused by excessive heat from the bearing.
If any of these conditions are observed, immediate cleaning, inspection, and appropriate maintenance should be performed.
When selecting a lubricant, viscosity is the primary factor to consider. However, other factors such as bearing pressure, operating temperature, surface condition, and lubrication method also play important roles. Key selection principles include:
- Use high-viscosity lubricants in environments with heavy loads, impact, or variable conditions.
- Opt for low-viscosity lubricants in high-speed applications to reduce energy loss.
- At higher operating temperatures, where oil becomes thinner, choose a lubricant with higher viscosity to maintain protection.
By following these guidelines, you can significantly extend the life of your chemical pump and improve overall system reliability.