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Vibration Analysis Report
The document is a vibration analysis report for a turbo generator at Nishat Dying Mills powerhouse. It analyzes vibration measurements taken at 14 points on the turbine and generator components at 100% load. Some measurements showed moderate vibration levels. Analysis of the generator bearing spectra and orbit plots indicated issues like excessive clearance, internal rubbing, and unstable lubrication film between the bearing and journal. Recommendations included inspecting and possibly replacing the generator bearings, and ongoing monthly monitoring and analysis to track bearing health.
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Vibration Analysis Report
- 1. N I SH AT D Y I N G M I L L S LT D , P O W R H O U E VIBRATION ANALYSIS REPORT OF TURBO GENERATOR 21-May-2016 Taqi ud Din Haider
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- 3. SR # Measuring’ s points Pointdescription Vibration 100% Load Remakes 1 T1A Turbine Axial S-1 C-1 21.68 Microns Within the limit 2 T2A Turbine Axial S-1 C-2 21.29 Microns Within the limit 3 T1X Turbine Outboard X S-2 C-1 22.74 Microns Within the limit 4 T1Y Turbine Outboard Y S-2 C-2 19.02 Microns Within the limit 5 T2X Turbine Inboard X S-2 C-3 13.40 Microns Within the limit 6 T2Y Turbine Inboard Y S-2 C-4 9.805 Microns Within the limit 7 G1X Shaft 01 Inboard X S-3 C-1 9.316 Microns Within the limit 8 G1Y Shaft 01 Inboard Y S-3 C-2 6.373 Microns Within the limit 9 G4X Shaft 02 Outboard X S-3 C-3 30.85 Microns Within the limit 10 G4Y Shaft 02 Outboard Y S-3 C-4 63.24 Microns Moderate 11 G6X Generator Inboard X S-4 C-1 46.26 Microns Moderate 12 G6Y Generator Inboard Y S4 C-2 95.79 Microns Moderate 13 G7X Generator Outboard X S-4 C-3 60.95 Microns Moderate 14 G7Y Generator Outboard Y S-4 C4 87.71 Microns Moderate OVERALL VIBRATION LEVEL
- 4. ISO 10816-13 VIBRATIONSEVERITY CHART
- 5. REPORT SUMMARY Plant NishatDying Location Unit-42 Equipment Turbo Generator 06 MW Health Status Moderate Explanation: Machine vibration found within the acceptable limits as per ISO 10816-3 but orbit analysis are showing irregular shape Please follow the report for detail analysis
- 6. OBSERVATIONS Observed Internalloop in unfiltered orbit of both bearings of Generator Found .5X in X and Y spectra of Gen. bearing
- 7. ANALYSIS In spectrumharmonics of 1 X turning speed of generator is an indication of excessive clearance in the bearing Dominant peak of 0.5 X in spectra of both bearings is clear indication of internal rub. Elliptical shape with inner loop of the orbit plots is an indication of oil whirl because of instable lubrication film b/w bearing and journal
- 8. RECOMMENDATIONS Please inspectthe both bearing of generator at priority Replace the bearing if found excessive clearance / rub Measure the vibration and check the vibration spectra once a month at least, and conduct the oil and wear analysis on monthly basis to monitor the bearing health
- 9. FFT VIBRATION SPECTRAMS& TWF RouteWaveform 21-May-16 11:41:24 P-P = 106.53 PK(+/-)=54.33/67.23 CRESTF=1.87 0 1 2 3 4 5 -80 -40 0 40 80 RevolutionNumber DisplacementinMicrons PGH -Steam Turbine6MW ST-6MW -015 Gen. InboardX Radial, S4-C1 RouteSpectrum 21-May-16 11:41:24 OVERALL=100.86D-DG P-P = 100.37 LOAD = 80.0 RPM=3000.(50.00Hz) 0 5 10 15 20 0 30 60 90 120 FrequencyinOrders P-PDispinMicrons .50 1.00 1.50 2.00 2.50 3.00 3.18 4.00 6.00 7.00
- 10. FFT VIBRATION SPECTRAMS& TWF RouteWaveform 21-May-16 11:41:24 P-P = 66.05 PK(+/-)=46.69/29.91 CRESTF=2.02 0 1 2 3 4 5 -40 -30 -20 -10 0 10 20 30 40 50 RevolutionNumber DisplacementinMicrons PGH -Steam Turbine6MW ST-6MW -016 Gen. InboardY Radial, S4-C2 RouteSpectrum 21-May-16 11:41:24 OVERALL=65.42D-DG P-P = 65.19 LOAD = 80.0 RPM=3000.(50.00Hz) 0 5 10 15 20 0 10 20 30 40 50 60 70 80 FrequencyinOrders P-PDispinMicrons .50 1.00 1.50 2.00 3.00 3.18 4.00 5.00 6.00 7.00
- 11. FFT VIBRATION SPECTRAMS& TWF RouteWaveform 21-May-16 11:41:24 P-P = 45.35 PK(+/-)=30.35/27.10 CRESTF=2.01 0 1 2 3 4 5 -30 -20 -10 0 10 20 30 40 RevolutionNumber DisplacementinMicrons PGH -Steam Turbine6MW ST-6MW -017 Gen. OutboardX Radial,S4-C3 RouteSpectrum 21-May-16 11:41:24 OVERALL=42.74D-DG P-P = 42.56 LOAD = 80.0 RPM=3000.(50.00Hz) 0 5 10 15 20 0 10 20 30 40 50 FrequencyinOrders P-PDispinMicrons .50 1.00 1.50 2.00 3.00 4.00 5.00 7.00 9.00 10.00
- 12. FFT VIBRATION SPECTRAMS& TWF RouteWaveform 21-May-16 11:41:24 P-P = 23.88 PK(+/-)=16.56/14.89 CRESTF=2.03 0 1 2 3 4 5 -20 -15 -10 -5 0 5 10 15 20 RevolutionNumber DisplacementinMicrons PGH -Steam Turbine6MW ST-6MW -018 Gen. OutboardY Radial,S4-C4 RouteSpectrum 21-May-16 11:41:24 OVERALL=23.11D-DG P-P = 23.00 LOAD = 80.0 RPM=3000.(50.00Hz) 0 5 10 15 20 0 3 6 9 12 15 18 21 FrequencyinOrders P-PDispinMicrons .50 1.00 1.50 2.00 3.00 4.00 5.00 7.00 9.00 10.00
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- 15. ORBIT PLOTS AFTERREPAIR