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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