@luis 1- where are the historical measurements? They are not included in the report. 2- when the issue has started? 3- cross section drawing for the pump and motor name plate. 4- i think there is redundant (similar) pump, can you please share the vibration report for that pump, including spectral plots. 5- have you checked the piping strain? I see that you are using SKF software, and i see some unpleasant configuration for the measurements and the report. If you are willing to improve, i can help you remotely to make good configuration. Feel free to share the requested measurements as SKF. MAB file. Regards, Mohammed
Natural frequency of your system/pump/piping/foundation is near 2x rpm. Your vibration data shows a small "mound" of energy at the base of 2x in horizontal direction, this is and indication that this frequency is close to or at the system natural frequency. The large ratio of vibration from H to V is also and indication of a natural frequency...
@Serge Borrell sir, There is some validity on your observation because when we pulled the bearings there signs of rotation on the outer ring. However, what puzzles me is that the bearing housing was sent to machine shop and have the housing measured in 3 different points and they said that the fit is acceptable. I attached the image of the pulled out bearings. Bearings are 3310B C3, 6311Z C3. In addition, bsf frequency of 6311 coincides with the 2x rpm...
@Dave Reynolds sir, Thank you for taking the time to read all the data and making these input recommendations. I also noticed that mound at the base of the 2x rpm and also considering a running misalignment issue due to the corrosion and no grouting at pump side...
@Jim Carrel sir, We have already done most of these, cross phase the machine and base bolts. There was a 200deg in one of the pump foot, but since we attempted to replace the pump base bolts at one point, I think this was corrected along the way. 2x rpm is still dominant. Phase also does not correspond to misalignment...
I am sorry Luis. I missed seeing "pump" on the spectrum's you had posted. The entire thread has "PUMP" written all over it. :) My bad, sorry. Question: Do you have a couple of waveform plots you can post from the pump horizontal? Have a Great Day...