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How to maximize bearing life

wallpapers Tech 2020-06-09
In theory, the service life of rolling bearings in centrifugal pumps is 20,000 to 80,000 hours, but the actual life depends on many factors-premature bearing failure will lead to costly equipment downtime, and sometimes even more serious consequences.
 
1. The right bearing selection
A satisfactory bearing service life starts with the correct bearing selection. From the beginning, bearing designers have extended bearing life and equipment performance by choosing the right bearing for different applications. Many factors are considered in this process, such as load, hardness, bearing life prediction, operating environment, and so on.
 
2, the correct storage
In principle, all bearings should be kept in their original packaging before installation. They need to stay in a clean, moisture-free, relatively constant temperature environment. Rolling bearings should be kept away from dust, water and corrosive chemicals. Shaking and vibration may permanently damage the mechanical properties of the bearing, so vibration must be avoided during handling and storage.
Basically, all bearings must be stored horizontally, because some heavy bearings may be deformed due to their own weight after being placed upright for a long time.
Pre-greased (or sealed) bearings require special care because the density of grease will change after long periods of storage. In this way, when the bearing is used for the first time, there will be a certain degree of rotation noise. Therefore, the shelving time of such bearings should be controlled according to the first-in first-out principle.
 
3, clean
Cleaning is very important for rolling bearings. The surface roughness of the rotating surface of the bearing ring and the rolling elements is usually 1/10 μm. Such a smooth surface is very sensitive to damage caused by contaminants. The lubricating layer between the rotating surfaces is usually 0.2~1 μm. Particulate impurities larger than the lubricant particle size will be excessively crushed by the rolling elements and generate local pressure in the bearing steel, which will eventually cause permanent material fatigue.
In addition to this, the size of dust particles in the external environment can reach 10 μm, which can also cause damage to the bearings. Therefore, a clean and dust-free environment is essential for bearing storage and installation.
 
4, fully prepared before starting the installation
Bearings should be carefully installed and removed using suitable tools. Industry experts estimate that 16% of premature bearing failures are due to incorrect installation. For a large number of installations (for example, in production installations), the installation is usually controlled under strict conditions, and suitable bearing installation equipment can also be used.
However, in maintenance or replacement work, the environment is diverse. Therefore, in order to ensure the longest bearing life, comprehensive preparation is necessary for bearing installation.
Related documents, such as drawings, maintenance manuals, product manuals, etc., need to be carefully studied. Next, all bearing components, such as shafts, distance rings, covers, washers, etc. must be kept absolutely clean from contamination. The status of adjacent parts should also be carefully checked.

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Tag: bearing life