sent summary report tg 500 run down 25th june 2010

8/9/2019 SENT Summary Report TG 500 Run Down 25th JUNE 2010

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SKF-Reliability Systems IndonesiaPT. Skefindo PrimatamaBRI II Bldg. 8th Fl. Suite 801, Jl. Jend. Sudirman Kav. 44-46, Jakarta 10210, IndonesiaTel: + 62 21 5793 2244 Fax: + 62 21 5795 3115

E-mail: [email protected] Website: www.skfindonesia.com www.skf.com

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Preliminary ReportRun Down Vibration Monitoring Service Report

For TG 500June 25th, 2010

Chevron Geothermal Salak, Ltd

Contract No. :
mailto:[email protected]://www.skfindonesia.com/http://www.skfindonesia.com/mailto:[email protected]


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CONTENT

1. Introduction

2. Scope of Service2.1 Scope of Work2.2 Duration of Work2.3 Technical Vibration Analysis Report

3. Methodology

3.1 Overall Alarm Definition3.2 Equipment Layout and Measurement Points3.3 Turbine Generator Manufacturing Data

4. Executive Summary4.1 Steam Turbine Generator Unit 500

5. Vibration Result & Analysis During Run Down


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1. INTRODUCTIONReferred to Turbine Generator Vibration Analysis and Measurement for inProfessional Services Contract No. C693083 between SKEFINDO PRIMATAMA andCHEVRON GEOTHERMAL SALAK, Ltd, the 4TH of Quarterly Vibration of 3 Set Turbineand Generator was performed in 6 June 2010 (Run down for overhaul TG unit 500), and

Detailed Vibration Analysis Report submitted in 11 June 2010

The accuracy and exactness of any machinery vibration analysis works depend to a greatextent to the availability of machines vibrations related data. This includes but not limitedto Turbine-Generator manufacture data, i.e. vibration severity data, key-phasor, andvibration sensor. Though with some machines in your plant the data are not yet available,we still tried to come up with an analysis based on our experiences on similar equipmentwith other industries.

2. SCOPE OF SERVICE

Chevron Geothermal Salak, Ltd. (CGS) operates three units of turbine generator, namelyTG Unit 400, TG Unit 500, and TG Unit 600, each has 66 MW installed capacity. Theseturbine-generators can be classified as critical equipments, since if any of the equipmentsfails, production of CGS power plant can significantly be impaired. Consequently, thenumber of unexpected failures must be minimized.The philosophy behind a Condition Monitoring system is to allow a machine to continue tooperate as long as it runs within its performance parameters. When it doesnt, the principalintent of the program is to provide a warning of any conditions that are changing beyondpreset parameters and to initiate investigative or corrective action. This could involve theprocess, the machine, or both.Periodic condition monitoring can identify early failure that appears before a functional

failure occurred.By having the means to anticipate problems and then plan accordingly, the equipmentreliability can be improved and unnecessary maintenance and production costs will bereduced. This is a result of taking corrective action only when it needs to be done.Some various failures mode of Turbine-generator are rotor imbalance, rotor bow,misalignment, oil whirl, oil whip, mechanical looseness, resonance, electrical problem, softfoot, rotor rub, and others.

The real time analyzer can give a comprehensive vibration data in real condition of turbine-generator, can be captured and represented simultaneously in steady state and transient(run-up & coast down) events.

2.1 Scope of WorkThe works that will be performed in this project are the following

a. Provide vibration expert / engineer for vibration measurement complete with PPE atChevron Geothermal Salak Ltd.

b. Shall measure and analyze vibration data at agreed schedule to the equipmentbelow:

i. Turbine T-400 and Generator G-400 (1 Unit)ii. Turbine T-500 and Generator G-500 (1 Unit)iii. Turbine T-500 and Generator G-500 (1 Unit)iv. Other rotating equipment as per Chevron Geothermal Salak, Ltd needed


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c. Carry out quarterly monitoring and analyzing of Turbine and Generator based onthe agreed schedule.

d. Prepare and setup all vibration tools and instrumentation.e. Measure and analyze Turbine and Generator vibration data at full load.f. Analyze vibration data and trend to determine the equipment condition. Contractor

shall also detect failure occurred on the equipment and procedure Possible FailureRoot Cause Analysis.

g. Provide engineering suggestion for corrective actions and performanceimprovements.

h. Propose preliminary report/field report and final report. The report should contain:i. Trending of vibration data and complete data, including the limit value for

each parameter shall comply with ISO: 10816 series, 7919 series, API 612,API 670.

ii. Assessment of machine conditioniii. Fault diagnostic of equipment failureiv. Suggested corrective actions or performance improvement.

i. Perform presentation (if required), by qualified person from Skefindo Primatama(SKF)

Skefindo Primatama, PT (SKF) will provide:

International Qualified personnels (ASNT LEVEL 2A (ISO CAT.II), LEVEL 2B (ISOCAT.III) and ASNT LEVEL 3) guidelines stipulated SNT-TC-1A and ISO 18436-2Standard.

Real Time Analyzer SKF Data Acquisition IMx-P, Portable Advance Analyzer SKF GX / AX Series, and Any accessories (cables, connectors, any consumable,etc.)

SKF Observer ver. 8.3 and SKF @ptitude Analyst Softwares

Preliminary / Detail report maximum 2 weeks after visit & Print out and soft copy ofreport.

SKF Standard and procedures for Condition Monitoring activities, Transportationand PPE.

Chevron Geothermal Salak, Ltd will provide:

Site safety orientation and Permit of Work.

Power to perform the job and Working place and Lunch / Dinner at Salak Area.

2.2 Duration of WorkThis work is planned to be performed within 2 years duration in 8 times visit. There is one(1) steady state event (normal condition) have been performed of vibration measurement.

2.3 Technical Vibration Analysis ReportThis is a 3rd measurement report and the result and analysis resumes referred to the latestreport from SKF and CGS technical information.This report is based on technical visit dated on 23 April 2010 versus 25 January 2010.


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3. METHODOLOGYThere are two methods of vibration measurement that will be conducted in this project, i.e.shaft vibration (relative motion) by Proximity Probe and bearing housing vibration(absolute motion) by Acceleration Probe.The shaft vibration measurement will be conducted using the existing proximities and the

running speed will be monitored by key-phasor.On machines with plain bearings (journal bearings), high casing to rotor weight ratios andhigh damping, the non-contacting displacement probe measures the actual motion of theshaft relative to the bearing at the direction as well as the amount (Figure 1).The bearing housing vibration is measured by acceleration sensor within 2 channelvibration method in simultaneous condition. Accelerometers are favored over velocitytransducers because of their better frequency response, ruggedness and price and arepreferred by API(American Petroleum Institute) 678 standards. Bearing housing is a special case of thehigh transmissibility system, and accelerometers are useful in detecting small impact offrequency signals that are often early warning of internal damage (Figure 2).

All data will be acquired using SKF IMx-P & AX / GX Series and be processed furtherusing analyzer software - Observer SW & Aptitude Analyst SW.3.1 Overall Alarm Definition

After review of all spectral data on a machine, if no problems are found, the first twocolumns(Good and Fair) are offered to give the customer a general feel for the overallcondition of each machine being assessed.

Corrective action should be taken on those machines having vibration exceedingWarning or ALARM 1 , while those exceeding Fault or ALARM 2 are felt to beexposed to such high levels as to render potentially catastrophic failure.Much work continues today on establishing standards for allowable overall vibration. Thisincludes the international working on machinery vibration standards, which is now workingto update several criteria.To acquire vibration data, Two (2) parameters of vibration amplitudes normally are used:

1. Vibration Velocity (by Acc. Sensor) [Horizontal Velocity (HORIZ-Vel), Vertical Velocity(VERT-Vel), Axial Velocity (AXIAL-Vel)] - Used to represent commonly experienced fatigueproblems like misalignment, imbalances, etc.) In mm/sec or in/sec

Figure 2 Figure 1


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a. ISO 10816-2; 1996 Mechanical vibration. Evaluation of machine vibration bymeasurements on non-rotating parts. Large land based steam turbine generatorsets in excess of 50MW.

b. Overall condition rating of Technical Associates of Charlotte, Inc. Copyright2000 with additional criteria for using these ratings are bellow:

1. Assuming Machine Speed = 500 to 50000 RPM; Assuming Measurement by Accelerometeror Velocity Pickup securely mounted as Close as Possible to Bearing Housing

2. Assuming Machine Is Not Mounted on Vibration Isolators (for Isolated Machine - Set Alarm

30-50% Higher); Set Motor Alarms the Same as that for the Particular Machine Type unlessOtherwise Noted.3. Consider Setting Alarms on Individual External Gearbox Positions about 25% Higher than

that for a particular Machine Type

2. Vibration Displacement (by Proximity Sensor) Vertical Displacement (VERT-Displ] It is used to measure shaft vibration, radial and axial shaft positioning anddifferential expansion between the case and rotor in mils or micron p-p.


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a. Vibration Displacement & Velocity Chart (Entek IRD Internationa, Milford,OH)

101.6 m p-

50.8 m p-p

3000 RPM


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b. Vibration Displacement Standard (Manufacturing Standard Fuji ElectricCo.,Ltd)

`

c. ISO 7919-2 2nd Edition (2001-11-15) - Land-based steam turbines and generatorsin excess of 50 MW with normal operating speeds of 1 500 r/min, 1 800 r/min, 3000r/min and 3500 r/min

Recommended values for maximum relative displacement of the shaft for steam turbines

and generators at the zone boundaries

MANUFAC. STD

TURBINE (m p-p) GENERATOR (m p-p)AXIAL

RADIAL RADIAL

TZ T1X T1Y T2X T2Y G1X G1Y G2

X

G2Y

ALERT 125 125 125 125 125 125 125 125

125

DANGER 250 250 250 250 250 250 250 25

0

250

T1

TURBINE 500T

T

1

1

GENERATOR 500

G2

G2

T1

T


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The ISO standards classify vibration level I the four zones i.e.:1. Zone A: The vibration of newly commissioned machine would normally fall

within this zone.2. Zone B: Machines with vibration within this zone are normally considered

acceptable for unrestricted long-term operation.

3. Zone C: Machines with vibration within this zone are normally consideredunsatisfactory for long-term continuous operation. Generally, the machinemay be operated for a limited period in this condition until a suitableopportunity arises for remedial action.

4. Zone D: Vibration value with this zone are normally considered to besufficient severity to cause damage to the machine

3.2 Equipment Layout and Measurement Points

Priority 1(C/D)

FAULT / CRITICALFailure is imminent. Requires immediate attention and repairshutdown should be seriously considered.Closely monitoring of the machine is a must.

Priority 2(B/C) WARNING Plan the repair shutdown on the next opportunity.

Priority 3(A/B)

FAIR Minor problem. Trending only.

Priority 4(A)

GOOD / NORMALNO action is recommended at this level. Data acquisition is as perschedule.

By Control Panel

IMx-P

T1

TURBINE 500T

T2

G1

G1

GENERATOR

T1

T2

Bently

Nevada


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Vertical

HorizontalAxial

GX Series

By STG Bearing Housing

XT1 -

TURBINE 500 GENERATOR

500

T1 -

XT2 -

T2 -

X G1 -

G1 -

X G2 -

G2 -

T1 - T2 - G1 - G2 -


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3.3 Turbine - Generator Manufacturing Data

TURBINEManufacture Fuji Electric Co., LtdType 2 Cylinders, 2 flow, reaction, condensingRated Speed 3000 RPMCritical Speed (1

s) 2200 RPM

Rated Output 70 MW grossStage 2x9 stagesRotor Weight 31799 kgBearing NDE Thrust bearing and Journal bearingBearing DE Journal BearingJournal Bearing Base carbon steel and Surface Babbitt 10.6 mm (thick)

Double wedge (type); 430 m (design clearance); Kongo (Manufacturer)Thrust Bearing Base CrMoNiV forged steel and surface babbitt

8 (number of pad); Mitchell (type); 660 mm2 (surface area); Kongo(manufacturer)

GENERATORManufacture Fuji Electric Co., LtdType SynchronousNumber of Pole 2Enclosure Totally Enclosed Water / Air Cooled (TEWAC)Output Capability 70 MVARate Speed 3000 RPMCritical Speed (1

sSpeed) 1303 RPM

Efficiency (full load) 98.4%Rate Voltage 11.8 kVAFrequency 50 HzCurrent 3166 ACoolant Temp 46 Deg Celsius (mech. design), 27.2 Deg Celsius (Process design)Number of Phase 3Insulation FRotor Weight 20400 KgBearing NDE Journal bearingBearing DE Journal bearingJournal Bearing Base carbon steel and surface Babbitt 10.6 mm (thick)

Double wedge (type); 430 m (design clearance); Kongo (Manufacturer)


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4. EXECUTIVE SUMMARY

4.14.1.1 Regarding captured online vibration monitoring TG unit #500 for run-down condition

on 25 June 2010, found OA vibration amplitudes at normal speed (steady state) and

turning gear condition below in range/standard, but still found slightly run-out onturbine and generator side, also still in below range/standard. Turbine GeneratorUnit #500. Generally is in normal condition

Steam Turbine Generator Unit 500

4.1.2 Captured vibration monitoring by using SKF GX-S handheld data collector device totake bearing housing vibration (body measurement) to monitor run-down conditionof such of 1X and 2XRPM frequencies especially at power transmission Couplingside and combine with take shaft on line vibration data by BN-3300 no significantvibration amplitude and specific frequencies, they are in normal condition

4.1.3 Check for rotor run-out (mechanical and electrical) on Turbine & Generators rotorat next TA

5. VIBRATION RESULT & ANALYSIS5.1 OVERALL VIBRATION RATING ISO 7919-2 TG UNIT 500 AT STEADY STATE

AND TURNING GEAR

OVERALL DATA TURBINEGENERATOR FOR RELATIVE MOTION MEASUREMENT

T/G Unit 500 Steady State (variable load) and Turning Gear

ASSETNAME

POSITION

POINTNAME

Amplitude Standardization

Steadystate 100%

Steadystate50%

Steadystate 8 %

TurningGear ISO 7919-2 Manuf.

(m p-p)

TURBINE

SIDE

T-NDET1-X 16.73 16.86 16.13 7.45 80 / 165 125 / 250

T1-Y 23.93 23.96 23.57 10.22 80 / 165 125 / 250

T-DET2-X 17.16 16.91 14.75 11.47 80 / 165 125 / 250

T2-Y 9.99 11.25 9.67 13.83 80 / 165 125 / 250

GEN. SIDE

G-DEG1-X 16.40 16.78 16.18 9.42 80 / 165 125 / 250

G1-Y 24.54 22.77 22.77 9.82 80 / 165 125 / 250

G-NDE

G2-X 14.62 15.36 15.36 6.07 80 / 165 125 / 250

G2-Y 36.00 30.49 30.49 7.07 80 / 165 125 / 250
mailto:[email protected]://www.skfindonesia.com/http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20T%20NDE%20&%20DE'!A1#'TG%20600%20-%20T%20NDE%20&%20DE'!A1http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20T%20NDE%20&%20DE'!A1#'TG%20600%20-%20T%20NDE%20&%20DE'!A1http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20T%20NDE%20&%20DE'!A1#'TG%20600%20-%20T%20NDE%20&%20DE'!A1http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20T%20NDE%20&%20DE'!A1#'TG%20600%20-%20T%20NDE%20&%20DE'!A1http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20G%20DE%20&%20NDE'!A1#'TG%20600%20-%20G%20DE%20&%20NDE'!A1http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20G%20DE%20&%20NDE'!A1#'TG%20600%20-%20G%20DE%20&%20NDE'!A1http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20G%20DE%20&%20NDE'!A1#'TG%20600%20-%20G%20DE%20&%20NDE'!A1http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20G%20DE%20&%20NDE'!A1#'TG%20600%20-%20G%20DE%20&%20NDE'!A1http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20G%20DE%20&%20NDE'!A1#'TG%20600%20-%20G%20DE%20&%20NDE'!A1http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20G%20DE%20&%20NDE'!A1#'TG%20600%20-%20G%20DE%20&%20NDE'!A1http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20T%20NDE%20&%20DE'!A1#'TG%20600%20-%20T%20NDE%20&%20DE'!A1http://c/Documents%20and%20Settings/BP6396/My%20Documents/SKEFINDO%20PRIMATAMA/RELIABILITY%20SYSTEMS%20DIV/RS%20-%20SERVICE/Service%20Report/Chevron%20Gn%20Salak/25%20Nov%2009.xls#'TG%20600%20-%20T%20NDE%20&%20DE'!A1#'TG%20600%20-%20T%20NDE%20&%20DE'!A1http://www.skfindonesia.com/mailto:[email protected]


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ORBIT AND TIME WAVEFORM TURBINEGENERATOR FOR RELATIVE MOTIONMEASUREMENT

Steady State Condition Turbine Side T1XY

Turning Gear Condition Turbine Side T1XY


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Turning Gear Condition Generator Side T3XY


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Steady State Condition Generator Side T4XY



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5.2 OVERALL VIBRATION RATING ISO 10816-2 TG UNIT 500 SA. TURBINE GENERATOR FOR ABSOLUTE MOTION MEAS. (BEARING HOUSINGVIBRATION)

ASSET

NAMEPoint

Measurement Type Standardization

OA DERIVED PEAK ISO10816-2

ProvenMethod

Steady

State

100%

Steady

State

50%

Steady

State 8%

Turning

Gear Mm/s peak

TURBINE

SIDE

T1-Z 1.63 1.87 1.86 0.15 5.4/10.6 6.9/10.2

T1-X 1.71 1.30 2.33 0.10 5.4/10.6 6.9/10.2

T1-Y 1.25 2.65 2.11 0.09 5.4/10.6 6.9/10.2

T2-Z 2.03 1.94 1.35 0.13 5.4/10.6 6.9/10.2T2-X 0.76 1.64 1.17 0.06 5.4/10.6 6.9/10.2

T2-Y 1.63 0.97 1.08 0.05 5.4/10.6 6.9/10.2

GENERA

TOR

SIDE

G1-Z 1.90 1.34 1.55 0.11 5.4/10.6 6.9/10.2

G1-X 2.48 2.73 1.21 0.19 5.4/10.6 6.9/10.2

G1-Y 1.47 1.18 1.09 0.05 5.4/10.6 6.9/10.2

G2-Z 3.94 4.25 3.48 0.17 5.4/10.6 6.9/10.2

G2-X 2.64 2.09 2.48 0.13 5.4/10.6 6.9/10.2

G2-Y 3.02 1.64 1.91 0.105.4/10.6

6.9/10.2

Asset Name Status Vibration Analysis Shaft Vibration (relative motion)

TURBINET-NDE

Appeared 1X and 2X RPM in orbit and spectrum plots although overall vibration

is in normal level referred to ISO and Manufacturer standards.OA decreased at TG (turning gear) condition. Slightly spike signal at timewaveform appeared. Check run out shaft at first time.

TURBINET-DE

Appeared normal impact signals (1XRPM and 2XRPM) with normal shaftvibration amplitude. Overall vibration is in normal condition, slightly spike signalat time waveform appeared. The overall vibration is in stable condition. Checkrun out shaft at first time.

GENERATORG-DE

Appeared spike signal in orbit (time waveform) as suspected the rotor surfacehas run out (electrical and mechanical). The OA vibration is in below range. OA

decreased at Turning Gear (TG) condition. Check run out shaft at first time.

GENERATORG-NDE

Slightly similar with DE generator appeared spike signal in orbit (time waveform)as suspected the rotor surface has run out (electrical and mechanical). The OAvibration is in below range. OA decreased at Turning Gear (TG) condition. Checkrun out shaft at first time.


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5.3 TURBINEGENERATOR UNIT 500 (TIME WAVEFORM PATTERN)

T1Z

T1X


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T1Y

T2Z


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T2X

T2Y


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T3Z

T3X


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T3Y

T4Z


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T4X

T4Y


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5.4 VIBRATION ANALYSIS TG UNIT 500 AT HOUSING BEARING

Asset Name Status Vibration Analysis through STG Bearing Housing

TURBINET-NDE

Dominant frequency still at 1X and 2X RPM in spectrum also randomfrequency. Characteristic spectrum at steady state to run down the spectrummost similarly and OA very minor when TG condition stage. OverallVibration is still in normal level referred to ISO and Manufacturer standards.NO SIGNIFICANT Found.

TURBINET-DE

DE Turbine side 1XRPM minor 2XRPM and mix with random frequency.The overall vibration value was very minor at this point. Characteristic thespectrum most similarly. Vibration is in normal level referred to ISO andManufacturer standards. NO SIGNIFICANT Found.

GENERATORG-DE

Steady state condition to run down frequency still dominant at 1X and 2XRPM mix with the slightly harmonic frequency characteristic spectrumrelative similar, vibration relative stable at steady state and very less at TG.The overall vibration is in normal condition. NO SIGNIFICANT Found.

GENERATORG-NDE

The axial direction dominant frequency at 1X and 2X RPM (for 2XRPMsuspected 2XElectric line Freq.) mixed with the slightly harmonic frequency,characteristic spectrum relative similar vibration relative stable at steadystate and very less at TG, at radial measurement still appeared harmonic


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CASCADE

BEARING #1 TURBINE SIDE HORIZONTAL

BEARING #1 TURBINE SIDE VERTICAL


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BEARING #2 TURBINE SIDE HORIZONTAL

BEARING #2 TURBINE SIDE VERTICAL


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BEARING #3 GENERATOR SIDE HORIZONTAL

BEARING #3 GENERATOR SIDE VERTICAL


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BEARING #4 GENERATOR SIDE HORIZONTAL

BEARING #4 GENERATOR SIDE VERTICAL


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BODE PLOT

TURBINE SIDE BEARING #1 & #2


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GENERATOR SIDE BEARING #3 & #4


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SCL BEARING #1


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SCL BEARING #2


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SCL BEARING #3


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SCL BEARING #4


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5.5 CASCADE,BODE PLOT AND SCL ANALYSIS TG UNIT 500 AT RUN DOWN

Asset Name Status Analysis of cascade,bode plot,shaft centre line TG 600

TURBINESIDE

The full spectrum cascade of shaft vibration measured on turbine non driveand bode plot depicted those figures are indicated that the 1st

critical speedis approximately 1002 rpmThe plot of average shaft centre line during run-down condition measured atturbine side shown that the average turbine shaft centre line migrates in thedown-right direction when the turbine speed reduce and the range ofmigration in acceptable range. This average shaft migration confirms thatbearing were working under considerably good operation condition

GENERATORSIDE

The full spectrum cascade of shaft vibration measured on turbine non driveand bode plot depicted these figures are indicated that the 1

stcritical speed

is approximately 1436 rpm

The plot of average shaft centre line during run-down condition measured atgenerator side that the average generator shaft centre line migrates in thedown-right direction when the turbine speed reduce and the range ofmigration in acceptable range. This average shaft migration confirms thatbearing were working under considerably good operation condition