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Vertical pump Centrifugal 2 stages 8 enclosed blades in one stage Speed:2985.9RPM=49.77Hz

williamreese
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Vertical pump Centrifugal 2 stages 8 enclosed blades in one stage Speed:2985.9RPM=49.77Hz

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  1. When failure, the pump sounded like engine. High velocity, high acceleration, hot bearing in pump. The pumps supply a constant water pressure to the firewater pipe ring( one orifice to discharge the water in the pipe ring ). So the flow rate for the pump should not change too much as no pressure alarm (If the pressure low, another pump will start). History:Hot bearing is a issues for these pumps. We changed the bearings for this pump 2 month ago. It seems that the turbulence from the inlet pipe could cause the cavitation some how and cause the bearing hot and fail. (The inlet pressure is enough for the N.P.S.H.).We surveyed the pump just 3 days ago. Everything was in a smooth trend. No symptoms for forthcoming failure.It is a vertical installed pump. Horizontal=X, Vertical=Y, Axial=Z Vertical pumpCentrifugal2 stages8 enclosed blades in one stageSpeed:2985.9RPM=49.77Hz

  2. Pump Inboard Horizontal readings were taken from here Vertical pumpCentrifugal2 stages8 enclosed blades in one stageSpeed:2985.9RPM=49.77Hz Similar with this pump. Our pump has 2 stages, this pump has 3 stages.

  3. Pump Inboard Horizontal Overall trend Changed bearing

  4. Pump Inboard Horizontal FFT Comparison with before failure 2 days ago, before failure 1X 8X

  5. Pump Inboard Horizontal Zoom in FFT 8X, Not changed too much at each survey 0.759mm/s 1X 0.919mm/s 0.719mm/s

  6. Pump Inboard Horizontal FFT Amplitude The dominant frequencies. non-synchronous. 8x is not dominant while comparing with others( can not see 8x in this table, it is too weak). The 24.37x are very dominant in all spectrums. 23.96x should relate to VPF. Bearing: SKF 3309FTF 19.89Hz=0.4XBSF 103.16Hz=2.073BPFI 159.15=3.198XBPFO 238.97=4.802X

  7. Pump Inboard Horizontal FFT Most of the dominant frequencies are non synchronous. Only Some are the harmonics of 29.09Hz or 1X(49.73Hz).

  8. Pump Inboard Horizontal FFT 8X, VPF Zoom in. 8X with low amplitude about 0.519mm/s16x low amplitude about 0.1mm/s 24x higher about 4.5mm/s

  9. Pump Inboard Horizontal FFT A lot of frequencies may be related to the Bearing FTF, because the FTF is too small( only 0.4x )

  10. Pump Inboard Horizontal FFT Can not see bearing fault

  11. Pump Inboard Horizontal FFT Can not see bearing fault

  12. Pump Inboard Horizontal FFT Can not see bearing fault

  13. Pump Inboard Horizontal Peakvue to see the impact Peakvue 4.67x? From the bearing(4.802x)? The bearing was greased 4 days ago. Vibration readings were normal 3 days ago. Bearing: SKF 3309FTF 19.89Hz=0.4XBSF 103.16Hz=2.073BPFI 159.15=3.198XBPFO 238.97=4.802X

  14. Pump Inboard Horizontal Waveform High acceleration

  15. Pump Inboard Horizontal Peakvue to see the impact Peakvue 1X 3 Days ago. Normal vibration. 2X

  16. Motor inboard 24.39x are dominant in 3 orientations of motor. The level in axial orientation is higher than the horizontal and vertical. Motor Axial, dominant frequencies are similar with the pump inboard.

  17. Motor inboard axial 3 days ago, before failure

  18. 24.40x

  19. Motor inboard axial

  20. Motor inboard Y (Vertical)

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