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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 a critical factor in extending the life of chemical pumps. To ensure effective lubrication, four key conditions must be met: â‘ The formation of a sufficient hydrodynamic oil film to provide adequate flexibility. â‘¡ A strong boundary film to prevent direct metal-to-metal contact. â‘¢ Clean lubricating oil free from contaminants. â‘£ An appropriate and sufficient supply of lubricant to maintain performance over time.
The effective lubrication period refers to the time during which the lubricated components function without abnormal wear. This period ends when signs of oxidation, aging, or degradation appear due to the lubricant itself or external factors. During this time, the lubricant reliably meets the required performance standards.
To visually assess the quality of lubrication in chemical pumps, several indicators can be observed:
- For oil-lubricated bearings, if scum or a film is found on the bearing surface, it may indicate that the temperature has exceeded the oil’s upper limit. If no oil residue remains, the bearing temperature is likely at or near the oil’s maximum limit. If the bearing appears dry with a foggy surface, the lubricant is nearing the end of its effective life.
- For grease-lubricated bearings, black and oily grease suggests that the load exceeds the grease’s capacity. If the grease turns white and spongy, it could be due to air bubbles or over-inflation. A homogeneous blue-black and dry appearance indicates that the grease is reaching its limit. If the grease has a hard outer layer but soft inside, it may have been exposed to heat. A completely hardened grease suggests that the bearing may have overheated. In any of these cases, immediate cleaning and inspection are necessary.
When selecting lubricants for chemical pumps, viscosity is the primary consideration. Other factors such as bearing load, operating temperature, friction surface condition, and lubrication method should also be taken into account. The selection principles include:
- Use high-viscosity lubricants in environments with heavy loads, impact, or variable loads.
- Opt for low-viscosity lubricants in high-speed sliding applications to reduce energy consumption.
- At higher operating temperatures, where oil becomes thinner, it is advisable to use higher viscosity lubricants to maintain proper film strength.
By following these guidelines, you can significantly extend the service life of your chemical pump and improve overall system reliability.