Help: The horizontal vibration of the bearing at the coupling end of the centrifugal pump is above the acceptable level – how can this be resolved?
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The bearing vibration at the coupling end of the OH2 type centrifugal pump is above the acceptable level; however, other measurements such as those in the vertical direction, as well as the horizontal and vertical positions at the load side, are within normal limits. This issue has been troubling us. Problems were not resolved through rotor dynamic balancing, foundation reinforcement, or alignment. I earnestly ask experts to share their insights!
I repaired a pump some time ago. For axis 3 with a diameter of 6, the highest vibration amplitude is 1.7 in the horizontal direction, and 3.9 in the vertical direction. The connection method used is cushion pads. Add a support at the inlet pipeline again, with a horizontal dimension of 1.5 and a vertical dimension of 2.7; use two supports in total. Currently, the highest levels are 1.4 vertically and 1.7. Pipeline stress also needs to be taken into account
You apply force to the pipeline with your hand. By checking whether there is a change in the amplitude, one can determine if it is due to the pipeline
1. Changes in the medium composition? 2. Tightness of the pump cover? 3. Severity of bearing vibration? 4. Inspection status of various components? 5. Vibration condition of the motor? 6. Process operation flow rate? If nothing else works, add supports at the bearing housing for reinforcement.
Check whether the tightening stress of the basic anchoring bolts of the equipment is sufficient, to prevent connections from lacking prestress due to short threads. This is just one factor that makes vibrations difficult to detect. Also, the levelness of equipment installation. It is also one of the overlooked ones, for reference.
Is it the online detection of the vibration probe that exceeds the limits, or is it the detection using a vibration meter to sense vibrations?