Abnormal wear of shaft bearings after the multi-stage pump has been in operation for 40 minutes
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The undriven end experiences significant vibration; upon opening the bearing housing, it was found that the bearing shaves were in poor condition. Alignment was fine, there was no overload, no cavitation, and new lubricating oil was used
Only the non-drive end experiences horizontal vibration of 10 mm/s; vibrations at all other locations are normal
Based on your description, the abnormal wear of the bearing shells could be caused by the following reasons: 1. Potential alignment issues with the equipment: Although you mentioned that alignment is fine, in practice even minor deviations can sometimes have serious consequences. It is recommended to use precise measuring equipment for a second inspection. 2. Lubrication issue: Even after replacing it with new lubricant, insufficient lubrication or an inappropriate type of lubricant can still cause wear. It is necessary to verify the quality of the lubricating oil, whether the oil pressure is normal, and whether the oil circuit is unobstructed. 3. Bearing installation issues: Improper bearing installation techniques, incorrect use of shims, or excessive bearing preload can also cause problems. 4. Rigidity issue: Improper rigidity of the pump and motor may cause the rotor to bend during operation, resulting in vibration and thus wear of the bearing shells. 5. Thermal expansion and contraction issue: The temperature is high when the pump is running and drops after it stops; during this process, the shaft bearings may be damaged due to thermal expansion and contraction. I hope the analysis above can provide you with some clues to solving the problem. If the problem persists, it is recommended that you contact a professional equipment repair specialist to conduct a thorough inspection of the device. .
It seems that the damage is caused by an installation issue. The damaged area being on one side indicates that the base tile is not in horizontal contact with the axis surface, which is what causes such skewed damage. Additionally, the oil supply at this filling point needs to be carefully checked; this situation wouldn’t occur if there was no lack of oil. For reference.
The poster has provided too little information. First of all, is it only the non-driving support shims that are damaged? Do the vibration levels and shim temperatures increase gradually after 40 minutes of operation, or what? Are there any other damages? What was the condition of this pump before? It seems that the damaged bearing bush is one that was just replaced with a new one.
The bearing bush and shaft are not properly aligned concentrically. Use a pressure gauge to adjust the adjustment bolts on both sides.
Judging from the damage to the wafer, it seems that the pump shaft is bent; the entire rotor system should be inspected, and finally the oil system should be checked as well.
It seems to be a mounting issue as well as a lack of oil
Judging from the wear condition of the bearing shells, it seems there may be an issue with the installation clearance or tension of these bearings; in addition, it is recommended to check for shaft bending and dynamic balance
After looking at the analysis earlier in it, I think the most likely issue is alignment. None of the others will experience this kind of wear. It’s probably due to a large size error in the mounting plate. If the connection issue isn’t serious, check the complete set of equipment again.