Catalyzing the blackening of the lubricating oil in the Jarlett double-housing slurry pump
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In a single-stage centrifugal pump, after operating for some time, the lubricating oil in the bearing housing turns black, while other parameters such as vibration and temperature remain normal. Upon disassembling the thrust deep groove ball bearing 7314, it was found that the surface of the main thrust rolling elements had patterns (crack-like marks) and was no longer smooth. The copper cage is worn. The bearings, bearing housings, volutes, impellers, and shafts were replaced multiple times. None of the problems have been solved. Is this situation caused by excessive axial force in the centrifugal pump? But this has never happened before. There have been no significant changes in operating conditions.
There have been no significant changes in operating conditions. Could you introduce what changes have taken place? Specific figures would be ideal!
Check the alignment of the coupling.
One is an increase in axial force, and the other is too small a bearing clearance
Either there is a problem with the balance disc, which prevents most of the axial force from being balanced.
Bearing wear and excessive axial force are likely related; check whether there is any running of the inner or outer circle of the bearing
There might be an issue with the way the bearing is installed, which has caused damage to the bearing
It shouldn’t, as the FAG engineers and the pump factory technicians have confirmed it
No, the fit between the inner and outer rings of the bearing is satisfactory. However, the oil is no longer dark; upon inspecting the bearing, it was found that the main thrust bearing is the one that has suffered significant wear, with the surface of its rolling elements showing a patterned appearance.
No problem; the laser alignment devices are all within 5 units