Problems associated with the use of shielded pumps
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This post was last edited by yxmqh on 2010-11-11 at 11:11. There are two centrifugal pumps in our workshop, and the bearing monitoring indicators for both have reached the red zone. Can these pumps still be used under such conditions? What does it mean when the pointer points to the red area?
It definitely can’t be transferred anymore! 1. Stop the machine and check whether the rotor is damaged. 2. Check if the bearings are severely worn. 3. Check whether the mouth ring is severely worn.
The TRG gauge comes in green, yellow, and red colors; the pointer being in the green area indicates that the pump is operating normally； Monitoring should be intensified or a stop for inspection is required when the pointer is in the yellow zone ； If the pointer is in the red zone, stop the machine immediately to check components such as the pump’s bearings, thrust discs, and seal rings.
Stop the machine immediately to inspect the internal components of the pump, such as the graphite bearings, thrust discs, stator, and rotor...
A certain component inside the pump is severely worn; pay special attention to the pump shaft and bearings. Please also pay special attention to checking whether the pump is running in reverse. Since the instruments manufactured by different companies serve different purposes, some are used to detect wear, while others are used to detect forward and reverse rotation. Please provide the specific brand of the pump.
Reply to 1# Bubble Gum: Everything mentioned above is correct. But I suggest: first measure the vibration to see if it exceeds the limits, whether it is higher than normal, and whether there have been any changes in the process parameters. Additional reason: That indicator is sometimes incorrect.
The red area indicates a problem with the pump bearing, or it may be running in reverse. It can’t run any longer; fix it right away
Stop the machine immediately to check whether the wear of the graphite bearings is beyond acceptable limits; over time this can lead to the destruction of the entire machine, including the rotor and impeller. This information is available in the manual – be sure to keep that in mind.
1. Wear of the thrust disc or bearings. 2. Bent shaft. 3. Missing phase or reversed phase.
It definitely needs to be stopped for inspection; it can only be used when it’s in normal condition.