Our three-stage between bearing pump features a first stage with double suction and single discharge. To measure shaft vibration, both DE and NDE side probes are installed at a 45-degree angle from the top. Currently, we are experiencing high online vibration on the NDE side Y probe, while the other proximity probes are showing steady values. Despite checking bearings, clearance, rotor runout, and alignment - all of which were found to be in good condition - the high vibration on the NDE side Y probe persists. Even after replacing the probe with a new one, the issue remains unresolved. The pump was removed and sent to the vendor workshop for a major overhaul and then reinstalled, but the vibration behavior persisted during commissioning. Any insights on what could be causing the ongoing high vibration on the NDE side probe would be greatly appreciated. Thank you, Suresh Karunakaran.
Have you reached out to the Original Equipment Manufacturer (OEM)? Have you connected with the OEM for assistance?
Hi Suresh, from your description, it seems like you've covered most of the standard checks. However, I think you might want to look into issues related to structural resonance. This could potentially result from incorrect installation or weak support structures. You could perform a bump test to confirm this. Also, consider the hydraulic effects which could stem from imbalances in the flow circulation or from the pump operating far off BEP (Best Efficiency Point). Changes in fluid properties such as viscosity, temperature, and density can sometimes cause such issues too. You might want to look into these areas.
Hi Suresh, it sounds like you've already done a thorough job diagnosing the issue, which is great. Since you've ruled out the common culprits like bearing health and alignment, have you considered checking for any external influences, such as piping stresses or foundation issues? Sometimes, vibrations can transmit through the structure or be caused by hydraulic imbalances within the pump, especially with a double suction design. It could also be worth evaluating the dynamic response of the system during operation to identify any resonance frequencies that may be coming into play. I hope this helps lead you to a solution!
Hi Suresh, it sounds like you've covered a lot of the usual suspects already! Given that the bearings and alignment seem good, have you looked into potential flow-induced vibrations or cavitation issues specific to that stage of the pump? Sometimes, even minor hydraulic imbalances can lead to unexpected vibration patterns. Additionally, consider checking the mounting of the probe itself—if it’s not firmly mounted or has a slight misalignment, it might pick up vibrations inaccurately, leading to misleading readings. It could also be worth examining the impeller or the pump casing for any signs of wear or damage that may not have been readily apparent during the overhaul. Hope you find the source soon!
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Answer: Answer: High vibration on the NDE side Y probe could be caused by various factors such as rotor imbalance, misalignment, structural resonance, rubs, or even issues with the probe itself.
Answer: Answer: The user mentioned that they have checked bearings, clearance, rotor runout, and alignment, as well as replaced the probe and sent the pump for a major overhaul. Despite these efforts, the issue persists.
Answer: Answer: Common reasons for persistent high vibration on a specific probe could include internal pump issues, such as impeller damage, cavitation, flow issues, or even problems with the piping system connected to the pump.
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