vibration condition report
TRANSCRIPT
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ReportCondition Vibration
Description:Machine -
Boiler feed pump C Equipment Name
32LAC30AP001 Asset No
1055876 Work Request
- Work Order
3X11WXH-15 Pump Type
2980 RPM Speed
HLE6454-26E Motor type
6.6 KV Power
Sleeve , thrust NDE : 7310 BRG For Pump DE/NDE
DE: Sleeve , NDE: Sleeve BRG for motor
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onclusion:CObservation &
-The vibration observed High by operation section @ P NDE H , fluctuated in this bearing between ( 2.1-5.5 mm/s RMS )
When the load changed at Steam turbine ,after mechanical team do maintenance on Minimum flow valve & back pressure
valve at discharge line , we taken vibration reading when the vibration @ 2.1 mm/s and at 4.9mm/s at pump bearing DE&
NDE , We observed changing the level of 1X and 10X @ DE H & NDE H direction @ pump and appears bearing
frequency @ NDE A in HD ENV Technique as illustrated below picture , and there is changing forces inside pump related
to flow changing , all pressure ( suction & discharge ) are acceptable valve compared with sister pump B , But
Unfortunately there is no flow meter @ discharge line of pump C , only in common header .
- Changing the 1X level in NDE H & DE H indicate there is resonate problem in pump related flow changing .
Vibration Reading Overall
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- Below table comparison over all reading on motor and pump (13/9/2021 & 4/10/2021) @ BFP C , When
the vibration level is Fluctuated from ( 2.5-4.6 mm/s rms ) with changing load of Steam Unit .
Vibration reading ( mm/s) rms@
4/10/2021
Vibration reading (
mm/s) rms@ 13/9/2021
Measurement point NO
0.44 0.56 M NDE H 1
0.43 0.40 M NDE V 2
0.30 0.29 M NDE A 3
0.79 0.71 M DE H 4
0.26 0.29 M DE V 5
0.28 0.34 M DE A 6 Vibration reading ( mm/s) rms@
4/10/2021
Vibration reading (
mm/s) rms@ 13/9/2021
Measurement point NO
4.22 2.58 P NDE H 1
0.75 0.83 P NDE V 2
1.0 0.74 P NDE A 3
4.86 0.87 P DE H 4
1.12 0.31 P DE V 5
0.44 0.28 P DE A 6
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-Trend for Over all vibration @ P NDE H , LOAD & FLOW as below Picture shows vibration change with
load change :
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pectrum:SVibration -
4/4/2021 ) :-for Period from ( 19/6/2020 historical dataWaterfull Plot CBFP -32
- Spectrum shows the 1X & 10 X peak Dominant as below :
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between 13/9/2021 & 4/10/2021 Reading: comparison BFP C Spectrum-32
-Below Vibration spectrum comparison for BFP C With changing vibration level, as you show 1X level
increase at P DE H & P NDE H.
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-Below Vibration spectrum for BFP C @ V& A Position, as you show overall level is low comparison with Horizontal
direction :
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-TWF @ Acceleration Gs (NDE H ) Shows there is high impact Energy .
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-HD ENV @ (P NDE H ) Shows there is impact Energy .
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- Log scale in y – direction shows clearly the side band around 10 X Freq , as below :
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& Recommendation Conclusion
1- Firstly, we need to check Minimum flow valve @ discharge line at pump C by thermal image camera when the
base load of steam turbine to check if there is passing.
2- Second, we need at Next shut down if applicable interchangeable between minimum flow of both pump(B& C )
and take Vibration reading again .
3- Continue Monitor of NDE Pump bearing .
:arefor Vibration and Temperature manufacture the alarms limits as -Note: 1
Pump: (Alarm: 6.5 mm/s, trip: 9.9 mm/s).
Motor: (Alarm: 2.99 mils, trip: 3.31mils).
Bearing Temperature for pump : <95 C (TD: 6S) TRIP
2- It’s difficult to monitor the sleeve bearing condition in early stage by casing measurement, the
best technique to monitor sleeve bearing are :
A-Orbit analysis by using Proximity probe
B- Oil analysis (wear particle, oil temperature changes …)
Prepared By: Eng. Ahmad Alfakeer
Date: 10/10/2021