N I S H AT DY 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-2016Taqi ud Din Haider

MACHINE SCHEMATIC DIAGRAM

SR # Measuring’s points Point description Vibration

100% Load Remakes

1 T1A Turbine Axial S-1 C-1 21.68 MicronsWithin the

limit2 T2A Turbine Axial S-1 C-2 21.29 Microns

Within the limit

3 T1X Turbine Outboard X S-2 C-1 22.74 MicronsWithin the

limit4 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 MicronsWithin the

limit6 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 MicronsWithin the

limit8 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 MicronsWithin the

limit10 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

ISO 10816-13 VIBRATION SEVERITY CHART

REPORT SUMMARY

Plant Nishat DyingLocation Unit-42Equipment Turbo Generator 06 MWHealth 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  

OBSERVATIONS

Observed Internal loop in unfiltered orbit of both bearings of Generator

Found .5X in X and Y spectra of Gen. bearing

ANALYSIS

In spectrum harmonics 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

RECOMMENDATIONS

Please inspect the 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

FFT VIBRATION SPECTRAMS & TWF

Route Waveform 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

Revolution Number

Dis

plac

emen

t in

Mic

rons

PGH - Steam Turbine 6MWST-6 MW -015 Gen. Inboard X Radial, S4-C1

Route Spectrum 21-May-16 11:41:24 OVERALL= 100.86 D-DG P-P = 100.37 LOAD = 80.0 RPM = 3000. (50.00 Hz)

0 5 10 15 20

0

30

60

90

120

Frequency in Orders

P-P

Dis

p in

Mic

rons

.50

1.00

1.50

2.00

2.50 3.00

3.18 4.00

6.00

7.00

FFT VIBRATION SPECTRAMS & TWF

Route Waveform 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

01020304050

Revolution Number

Dis

plac

emen

t in

Mic

rons

PGH - Steam Turbine 6MWST-6 MW -016 Gen. Inboard Y Radial, S4-C2

Route Spectrum 21-May-16 11:41:24 OVERALL= 65.42 D-DG P-P = 65.19 LOAD = 80.0 RPM = 3000. (50.00 Hz)

0 5 10 15 20

0

10

20

30

4050

60

7080

Frequency in Orders

P-P

Dis

p in

Mic

rons

.50

1.00

1.50 2.

00

3.00

3.18 4.00

5.00 6.00

7.00

FFT VIBRATION SPECTRAMS & TWF

Route Waveform 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

3040

Revolution Number

Dis

plac

emen

t in

Mic

rons

PGH - Steam Turbine 6MWST-6 MW -017 Gen. Outboard X Radial, S4-C3

Route Spectrum 21-May-16 11:41:24 OVERALL= 42.74 D-DG P-P = 42.56 LOAD = 80.0 RPM = 3000. (50.00 Hz)

0 5 10 15 20

0

10

20

30

40

50

Frequency in Orders

P-P

Dis

p in

Mic

rons

.50

1.00

1.50

2.00

3.00 4.00

5.00

7.00

9.00

10.0

0

FFT VIBRATION SPECTRAMS & TWF

Route Waveform 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

05

10

1520

Revolution Number

Dis

plac

emen

t in

Mic

rons

PGH - Steam Turbine 6MWST-6 MW -018 Gen. Outboard Y Radial, S4-C4

Route Spectrum 21-May-16 11:41:24 OVERALL= 23.11 D-DG P-P = 23.00 LOAD = 80.0 RPM = 3000. (50.00 Hz)

0 5 10 15 20

0

3

6

9

12

15

1821

Frequency in Orders

P-P

Dis

p in

Mic

rons

.50 1.

001.

50 2.00

3.00 4.

00

5.00

7.00 9.00

10.0

0

ORBIT PLOTS

IMAGES

ORBIT PLOTS AFTER REPAIR