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STEAM TURBINE ENGINEERING AND MAINTENANCE, INC.

HP/RH/LP Steam Path Audit and Repair Recommendations

March/April 2007 Fall Outage TB#, HP/RH/LP General Electric HP/RH/LP Sections 200 MW Cross Compound

2nd Stage HP Bucket as Found Foreign Object Damage.

891 Nissen Drive 32034 Phone: 904-321-1946 PO Box 15010 32035-3101 Fax: 904-321-2701 Fernandina Beach, FL Cell: 904-535-4330


EXECUTIVE SUMMARY March 31, 2007 Steam Turbine Engineering And Maintenance, Inc. was engaged to perform a Steam Path Audit on unit #4 during the March/April 2007 scheduled outage. We arrived on-site the morning of March 16 to start the Audit. The Audit was completed on March 22. This 200 MW, 1050/1000 °F, 2400 psi General Electric cross compound unit is in fairly good condition for the years of reliable service that it has seen. During this outage the HP, RH and LP sections of the machine are scheduled for the outage. High Pressure Section The High-pressure section, in the as found condition, is estimated to have an efficiency loss of approximately 11.9%. A large part of the efficiency losses are due to heavy coating buildup on the diaphragm partitions and bucket vanes. Other factors include damaged and rubbed bucket tip spill strips and packing. Moderate losses from flow path damage and surface roughness also contributed to the HP efficiency losses. The damaged N2 packing also contributed to efficiency losses allowing a significant amount of leakage into the reheat section. In general the buckets on the HP rotor and all of the associated hardware suffer from heavy to light FOD, Foreign Object Damage. The 2nd, 3rd 4th and 5th stage buckets should be replaced during the next scheduled outage. Diaphragm stages 1-7 have all been previously majored. The 2nd through 7 stage diaphragms suffer from heavy to moderate FOD and will require major repairs during the next scheduled outage. Stages 8 and 9 have also been majored previously and are still in relatively good condition. The 9th stage diaphragm partition edges were cut back .030” during this outage. The 1st stage nozzle may also require major repairs during the next scheduled outage. The HP bucket tip spill strips will be replaced during this outage except on stages 2 and 9. The N2 packing will be replaced during this outage. The inter-stage packing on stages 2-6 in the HP will also be replaced during this outage. The HP section is estimated to have a 3 - 3.5% efficiency loss from design after completion of the 2007 outage. Reheat Section The Reheat section, in the as found condition, is estimated to have an efficiency loss of approximately 3.6%. The majority of the RH section losses are due to excessive packing and spill strip clearances, heavy coating deposits on the bucket cover ID’s and minor FOD. All reheat buckets, covers and tenons are in reasonably good condition and should perform well for a good number of years. The 10th stage diaphragm will probably require major repairs during the next scheduled outage. The remaining RH diaphragms, stages 11-13, will be repaired as minors during this outage. During the next scheduled outage RH diaphragm stages 11-13 will probably will require only minor repairs. The RH bucket tip spill strips on stages 10 and 13 will be replaced during this outage. The RH section inter-stage packing was found in good condition and will be re-used. The RH section is estimated to have a 1.0 to 1.5% efficiency loss from design after completion of the 2007 outage.

Low Pressure Section The LP section, in the as found condition, is estimated to have an efficiency loss of approximately 2.0%. Approximately 25% of the LP section losses are due to excessive packing and spill strip clearances. Approximately 50% of the losses are due to coating buildup and surface roughness. The remaining LP losses are due to minor FOD and general wear. The 1st stage LP bucket tenons were found severely eroded on the leading edges. The 1st stage LP tenons were weld repaired during this outage. The last stage LP buckets were previously under-shroud brazed. The silver was found loose on the bucket tips. The silver was ground off and the tips re-soldered during this outage. The remaining LP buckets, covers and tenons are in reasonably good condition. All LP diaphragms will be repaired as minors during this outage. The LP diaphragms should be able to be repaired as minors again at the next scheduled outage. The LP spill strips on stages 1,4,5,6 and 7 will be changed during this outage. The LP packing was found in relatively good condition and will not be replaced during this outage. The LP section is estimated to have a .5 - .75% efficiency loss from design after completion of the 2007 outage. In the as found condition, unit #4 is estimated to have an efficiency loss of 5.33%. New spill strips and packing will be installed in most of the HP section. New spill strips will be installed on stages 10 and 13 in the RH section. And new spill strips will be installed in the LP section on stages 1,4,5,6 and 7 during this outage. The RH and LP packing was found to be in relatively good condition. With these improvements, along with the diaphragm repairs and bucket repairs planned to be completed this outage the unit should come back up no more than 1.5-2.0% off of the original design. If you have any questions or wish to discuss any of the above in greater detail, please feel free to contact us at your convenience. And we would like to thank the outage personnel for their timely support and cooperation during the time we were on-site. Dan McCarthy

Phone: 904-321-1946 Fax: 904-321-2701 Cell: 904-535-4330 E-mail [email protected] 891 Nissen Drive 32034 Phone: 904-321-1946 PO Box 15010 32035-3101 Fax: 904-321-2701 Fernandina Beach, FL Cell: 904-535-4330

mailto:[email protected]

1


Rotor and Diaphragm Visual Inspection

Unit #4 HP/RH TB# ******, LP TB# ******

March/April 2007 Outage March 19, 2007

HP Diaphragms 1st Stage Nozzle 35 Openings per half R.H. = 1.000 I.W. Dia. ≈ 35.125 T @ Y ≈ .360

1. The partitions in the upper and lower nozzle plate have moderate FOD, Foreign Object Damage, on the partition convex surface.

2. 2-3 partitions in the upper half and 1-2 partitions in the lower half are eroded and will require weld repairs.

3. The bucket cover spill strip is rubbed and has pieces broken out. 4. The nozzle bolt cover plate and welds appear to be in good condition. 5. There is a .010” coating buildup on the convex surface of the partitions.

Repair Recommendations: Minor Repair

1. Weld repair partitions in the U.H. and L.H. as required including any indications found during N.D.E.

2. Weld repair NDE indications and heavy FOD as required. 3. Replace bucket cover spill strip.

2nd Stage 35 Openings per half R.H. = 1.150 I.W. Dia. ≈ 31.125 T @ Y ≈ .320

1. All partitions are intact. There is some moderate FOD on the partition convex surface.

2. The inner and outer sidewalls are in good condition. 3. The admission sides of the partitions are in good condition. 4. There are 6-8 partitions in each half with bent and dinged exhaust edges. 5. The steam seal face has some fretting and galling. 6. The crush pins appear to be worn. 7. There is a .060” coating buildup in the throat area and a .020” coating

buildup on the remaining convex surface. There is a .010 coating buildup on the concave surface of the partitions.

8. The horizontal joint faces appear to be in good condition. Repair Recommendations: Minor Repair

1. Straighten exhaust edges as required. 2. Weld repair any indications found during N.D.E. 3. Polish FOD high spots.

24. Polish steam seal face, check crush pin fit areas in the shell and replace

crush pins 1” from current location if required.

3rd Stage 22 Openings per half R.H. = 1.225 I.W. Dia. ≈ 31.500 T @ Y ≈ .560

1. All partitions are intact. There is some moderate FOD on the partition convex surface.




1. Straighten exhaust edges as required. 2. Weld repair any indications found during N.D.E. 3. Polish FOD high spots. 4. Polish steam seal face, check crush pin fit areas in the shell and replace

crush pins 1” from current location if required. 4th Stage 34 Openings per half R.H. = 1.400 I.W. Dia. ≈ 32.125 T @ Y ≈ .370

1. All partitions are intact. There is some minor FOD on the partition convex surface.





crush pins 1” from current location if required.

35th Stage 35 Openings per half R.H. = 1.600 I.W. Dia. ≈ 33.000 T @ Y ≈ .360













1. All partitions are intact. There is some very minor FOD on the partition convex surface.

42. The inner and outer sidewalls are in good condition. 3. The admission side of the partitions is in good condition. 4. There are 1-2 partitions in each half with bent and dinged exhaust edges. 5. The steam seal face appears to be in good condition. 6. The crush pins appear to be in good condition. 7. There is a .050” coating buildup in the throat area and a .020” coating






2. The inner and outer sidewalls are in good condition. 3. The admission sides of the partitions are in good condition. 4. There are 1-2 partitions in each half with bent and dinged exhaust edges. 5. The steam seal face appears to be in good condition. 6. The crush pins appear to be in good condition. 7. There is a .050” coating buildup in the throat area and a .020” coating






2. The inner and outer sidewalls are in good condition. 3. The admission sides of the partitions are in good condition. 4. There are 1-2 partitions in each half with bent and dinged exhaust edges. 5. The steam seal face appears to be in good condition. 6. The crush pins appear to be in good condition. 7. There is a .050” coating buildup in the throat area and a .020” coating


8. The horizontal joint faces appear to be in good condition.

5Repair Recommendations: Minor Repair


Future HP Diaphragm Repairs

The 2nd, 3rd, 4th, 5th, 6th, and 7th Stage diaphragms will require major repairs during the next scheduled turbine outage. The above stage diaphragms are structurally in acceptable condition, however the partitions suffer from heavy FOD resulting in significant efficiency losses.

HP/RH Rotor HP Single Flow Stages 1-9 1st Stage HP Buckets 108 spaces, Notch Block. A.L. ≈ 1.025” Cover Dia. 38.692” Throat @Y≈ .400”

1. The admission sides of the vane sections have minor FOD. The bucket vanes have a S.P.E. resistant coating. There are a few vanes that have small areas where the coating has been knocked off by impact of foreign objects.

2. The exhaust sides of the vane sections are in good condition. 3. The outer covers are down tight on the vane tips. There is some minor FOD on the cover

OD’s. 4. The tenons have some minor FOD on the leading edges. 5. The notch block is down tight. 6. The vane exhaust edge thickness is ≈ .050”. 7. A coating buildup of ≈ .025” was found on the convex surface.

Repair recommendations:

1. No repairs required. 2nd Stage HP Buckets 110 spaces, Notch Bkt. A.L. ≈ 1.200” Cover Dia. 33.902” Throat @Y≈ .380”

1. The admission sides of the vane sections have heavy FOD. The vane admission edges are thin and there are a few bent admission edges.

2. The exhaust sides of the vane sections have some minor FOD and a few bent exhaust edges

3. The bucket covers, fox-hole construction, are down tight on the vane tips. There is moderate FOD on the cover OD’s.

4. The tenons have moderate FOD all over. 5. The notch bucket is down tight. 6. The vane exhaust edge thickness is ≈ .015”. 7. The bucket root radial spill strip is in good condition. 8. A coating buildup of ≈ .015” was found on the convex surface.


1. Straighten the admission and exhaust edges as required. 2. Cut back admission edges .060” to thicken and stabilize. 3. Cut back the exhaust edges .040” to thicken and stabilize. 4. Polish FOD high spots on the admission side of the vane sections.

3rd Stage HP Buckets 112 spaces, Notch Bkt. A.L. ≈ 1.325” Cover Dia. 34.702” Throat @Y≈ .380”

1. The admission sides of the vane sections have moderate FOD. There are a few bent

admission edges. 2. The exhaust sides of the vane sections have some minor FOD and a few bent exhaust

edges 3. The bucket covers, fox-hole construction, are down tight on the vane tips. There is minor

FOD on the cover OD’s and admission edges. 4. The tenons have moderate FOD all over. 5. The notch bucket is down tight. 6. The vane exhaust edge thickness is ≈ .015”. 7. The bucket root radial spill strip has a minor rub. 8. A coating buildup of ≈ .035” was found on the convex surface and ≈ .005” on the

concave surface. Repair recommendations:

1. Straighten the admission and exhaust edges as required. 2. Polish FOD high spots on the admission side of the vane sections. 3. Sharpen bucket root radial spill strip.

4th Stage HP Buckets 114 spaces, Notch Bkt. A.L. ≈ 1.450” Cover Dia. 35.402” Throat @Y≈ .380”

1. The admission sides of the vane sections have moderate FOD. There are a few bent admission edges.


3. The bucket covers are down tight on the vane tips. There is heavy FOD on the cover OD’s and admission edges.

4. The tenons have heavy FOD all over. 5. The notch bucket is down tight. 6. The vane exhaust edge thickness is ≈ .015”. 7. The bucket root radial spill strip has a minor rub. 8. A coating buildup of ≈ .035” was found on the convex surface and ≈ .005” on the

concave surface.


1. Straighten the admission and exhaust edges as required. 2. Polish FOD high spots on the admission side of the vane sections. 3. Sharpen bucket root radial spill strip.


1. The admission sides of the vane sections have moderate FOD.


3. The bucket covers are down tight on the vane tips. There is heavy FOD on the cover OD’s and admission edges.

4. The tenons have heavy FOD on the leading edges. 5. The notch bucket is down tight. 6. The vane exhaust edge thickness is ≈ .015”. 7. The bucket root radial spill strip has a minor rub. 8. A coating buildup of ≈ .030” was found on the convex surface and ≈ .005” on the


1. Straighten the exhaust edges as required. 2. Polish FOD high spots on the admission side of the vane sections. 3. Sharpen bucket root radial spill strip.


1. The admission sides of the vane sections have light to moderate FOD. 2. The exhaust sides of the vane sections have some very minor FOD. 3. The bucket covers are down tight on the vane tips. There is light to moderate FOD on the

cover OD’s and admission edges. 4. The tenons have moderate to heavy FOD on the leading edges. 5. The notch bucket is down tight. 6. The vane exhaust edge thickness is ≈ .040”. 7. The bucket root radial spill strip has a minor rub. 8. A coating buildup of ≈ .025” was found on the convex surface and ≈ .005” on the


1. Polish FOD high spots on the admission side of the vane sections. 2. Sharpen bucket root radial spill strip.


1. The admission sides of the vane sections have light to moderate FOD. 2. The exhaust sides of the vane sections have some very minor FOD. 3. The bucket covers are down tight on the vane tips. There is light FOD on the cover OD’s

and admission edges. 4. The tenons have moderate FOD on the leading edges. 5. The notch bucket is down tight.

6. The vane exhaust edge thickness is ≈ .040”. 7. The bucket root radial spill strip has a heavy rub. 8. A coating buildup of ≈ .025” was found on the convex surface and ≈ .005” on the




1. The admission sides of the vane sections have light to moderate FOD. 2. The exhaust sides of the vane sections have some very minor FOD. 3. The bucket covers are down tight on the vane tips. There is light FOD on the cover OD’s

and admission edges. 4. The tenons have light to moderate FOD on the leading edges. 5. The notch bucket is down tight. 6. The vane exhaust edge thickness is ≈ .040”. 7. The bucket root radial spill strip has a heavy rub. 8. A coating buildup of ≈ .025” was found on the convex surface and ≈ .005” on the




1. The admission sides of the vane sections have light FOD. 2. The exhaust sides of the vane sections have some very minor FOD. 3. The bucket covers are down tight on the vane tips. There is light FOD on the cover OD’s

and admission edges. 4. The tenons have light FOD on the leading edges. 5. The notch bucket is down tight. 6. The vane exhaust edge thickness is ≈ .040”. 7. The bucket root radial spill strip has a heavy rub. 8. A coating buildup of ≈ .025” was found on the convex surface and ≈ .005” on the


1. Polish FOD high spots on the admission side of the vane sections.

2. Sharpen bucket root radial spill strip. RH Single Flow Stages 10, 11, 12 10th Stage RH Buckets 112 spaces, Notch Block. A.L. ≈ 2.600” Cover Dia. 46.240” Throat @Y≈ .430”

1. The admission sides of the vane sections have some minor FOD. The bucket vanes have a S.P.E. resistant coating. There are a few vanes that have small areas where the coating has been knocked off by impact of foreign objects.

2. The exhaust sides of the vane sections are in good condition. 3. The covers, fox-holed construction, are down tight on the vane tips. There is some very

minor FOD on the cover OD’s. 4. The tenons have some minor erosion on the leading edges. 5. The notch block shows sign of some lifting, ≈ .025” on the admission side and ≈ .015” on

the exhaust side. 6. The vane exhaust edge thickness is ≈ .045”. No coating buildup was found on the vane

sections or cover ID’s. Repair recommendations:

1. Monitor the notch lifting during the next scheduled outage. 11th Stage RH Buckets 144 spaces, Notch Bkt. A.L. ≈ 3.100” Cover Dia. 47.660” Throat @Y≈ .380”

1. The admission sides of the vane sections have some minor FOD. 2. The exhaust sides of the vane sections are in good condition. 3. The covers are down tight on the vane tips. There is some very minor FOD on the cover

OD’s. 4. The tenons have some minor erosion on the leading edges. 5. The notch bucket shows sign of some lifting, ≈ .015” on the admission and exhaust sides. 6. The vane exhaust edge thickness is ≈ .050”. A .125 coating buildup was found on the ID

of the bucket covers. No coating buildup was found on the vane sections. Repair recommendations:

1. Monitor the notch lifting during the next scheduled outage.

12th Stage RH Buckets 128 spaces, Notch Block A.L. ≈ 3.675” Cover Dia. 49.332” Throat @Y≈ .420”

1. The admission sides of the vane sections have some minor FOD. 2. The exhaust sides of the vane sections are in good condition. 3. The covers are down tight on the vane tips. There is some very minor FOD on the cover

OD’s.

4. The tenons have some very minor erosion on the leading edges. 5. The notch block is down tight. 6. The vane exhaust edge thickness is ≈ .040”. A .188 coating buildup was found on the ID

of the bucket covers. No coating buildup was found on the vane sections. Repair recommendations:

1. No repairs required.

HP/RH Rotor Body Journals

The #1 and #2 journals are in relatively good condition. There is only minor scoring on each. The journals will only require strap lapping prior to going back in service. The active and inactive faces on the thrust collar are in good condition and do not require any repairs.

Packing Lands

The end packing and inter-stage packing lands appear to be in good condition. Only some very light rubs were observed. Intermittent indications were found in the N2 heat groove adjacent to the first stage buckets on the admission side. In addition indications were found in the heat grooves between the 1st and 2nd stages and between the 2nd and 3rd stages. The indications were removed locally and the area polished.

Future HP/RH Rotor Repairs

During the next scheduled outage the 2nd, 3rd, 4th and 5th stage buckets should be replaced. The rest of stages on the HP/IP rotor should still be in relatively good condition at the next scheduled outage, approximately 7 years from now. The reheat section buckets, stages 10-13 are in good condition and probably will not require any repairs during the next scheduled outage.

Steam Turbine Performance Evaluation Program Unit 4 Opening Audit Results

Unit #4 Steam Path Audit Results 3-07 Audit Options :

Description : Unit #4 Steam Path Audit Results 3-07 Perform Ellipticity & Spring Clearance Corrections : Number of Tooth Height Measurements : 8 Surface Roughness Gradations : 3 Hand Calculations By : Stage Loss Values : Change In G.T.H.R. (Btu/kWh) First Year Fuel Cost ($)

Audit Results: Unit #4 Steam Path Audit Results 3-07: Summary : Totals

Change In First YearG.T.H.R. Fuel Cost

Audit Category Btu/kWh $Interstage Packings 38.07 100837Tip Spill Strips 42.80 113387Shaft End Packings 43.53 115305 Steam Seal System Loss 0.00 0Miscellaneous Leakages 0.00 0Flow Path Damages 74.58 197568 Flow Change Impact 0.00 0Surface Roughness 150.59 398929Trailing Edge Thickness 8.32 22043Cover Deposits 5.05 13374Hand Calculations 0.00 0

Turbine Total 432.16 1144792

eSTPE™ 7.7 3/31/2007 11:57AM Page 1 S.T.E.A.M., INC.


Audit Results: Unit #4 Steam Path Audit Results 3-07: Summary : IP Casing


Audit Category Btu/kWh $Interstage Packings 1.28 3391Tip Spill Strips 11.89 31490Shaft End Packings 3.16 8361Miscellaneous Leakages 0.00 0Flow Path Damages 0.00 0Surface Roughness 7.50 19879Trailing Edge Thickness 4.20 11114Cover Deposits 4.03 10682Hand Calculations 0.00 0Total 32.16 85186Subdivision Efficiency Change : 3.64 %Audit Subdivision Efficiency : 86.37 %

Audit Results: Unit #4 Steam Path Audit Results 3-07: Summary : HP Casing





Audit Results: Unit #4 Steam Path Audit Results 3-07: Summary : LP Casing



Current Audit Results: Comparison : - WARNING: Only one audit has been created, so Comparison is not available

Audit Results: Unit #4 Steam Path Audit Results 3-07: Interstage Packings : Totals

Change In First YearDescription G.T.H.R. Fuel Cost

Btu/kWh $IP Casing 1.28 3391HP Casing 33.25 88080LP Casing 3.48 9210

Turbine Total 38.07 100837



Audit Results: Unit #4 Steam Path Audit Results 3-07: Interstage Packings : IP Casing

Corrected StageLeakage Average Average Efficiency Change In First Year

Description Flow Clearance Clearance Wear Loss G.T.H.R. Fuel Costlb/h in. in. in. % Btu/kWh $

Stage 13 3749 0.053 0.053 0.038 0.36 0.77 2046Stage 12 5118 0.047 0.047 0.032 0.08 0.16 421Stage 11 4177 0.030 0.030 0.015 0.08 0.13 350Stage 10 6087 0.042 0.042 0.027 0.14 0.22 573Total 1.28 3391

Audit Results: Unit #4 Steam Path Audit Results 3-07: Interstage Packings : HP Casing



Stage 2 46012 0.048 0.048 0.033 2.26 3.85 10209Stage 3 51440 0.054 0.054 0.039 4.13 7.55 19997Stage 4 40240 0.048 0.048 0.033 2.55 5.07 13427Stage 5 25441 0.038 0.038 0.023 0.78 1.68 4455Stage 6 26435 0.042 0.042 0.027 1.93 4.51 11952Stage 7 18631 0.047 0.047 0.032 2.15 2.95 7808Stage 8 20775 0.063 0.063 0.048 2.72 4.02 10658Stage 9 16869 0.059 0.059 0.044 2.13 3.39 8989Total 33.25 88080



Audit Results: Unit #4 Steam Path Audit Results 3-07: Interstage Packings : LP Casing



Stage 1 0 0.000 0.000 0.000 0.00 0.00 0Stage 2 2153 0.041 0.041 0.026 0.10 0.15 387Stage 3 1931 0.044 0.044 0.029 0.09 0.15 401Stage 4 1436 0.039 0.039 0.024 0.06 0.11 297Stage 5 4066 0.049 0.049 0.024 0.11 0.23 618Stage 6 4313 0.051 0.051 0.026 0.40 0.92 2445Stage 7 2611 0.050 0.050 0.025 0.24 0.67 1764Stage 8 1312 0.036 0.036 0.011 0.07 0.57 1509Stage 9 537 0.055 0.055 0.030 0.06 0.67 1786Total 3.48 9210

Audit Results: Unit #4 Steam Path Audit Results 3-07: Balance Holes : IP Casing

LeakageFlow

Description lb/hStage 13 2294Stage 12 5300Stage 11 5578Stage 10 5891



Audit Results: Unit #4 Steam Path Audit Results 3-07: Balance Holes : HP Casing

LeakageFlow

Description lb/hStage 1 0Stage 2 37928Stage 3 32252Stage 4 28764Stage 5 23299Stage 6 17016Stage 7 7157Stage 8 6739Stage 9 4637

Audit Results Unit #4 Steam Path Audit Results 3-07: Balance Holes : LP Casing

LeakageFlow

Description lb/hStage 1 8491Stage 2 8841Stage 3 7817Stage 4 6627Stage 5 7303

Audit Results Unit #4 Steam Path Audit Results 3-07: Root Spill Strips : IP Casing

No results to report.

eSTPE™ 7.7 3/31/2007 11:57AM Page 6 S.T.E.E.A.M., INC.


Audit Results: Unit #4 Steam Path Audit Results 3-07: Root Spill Strips : HP Casing

CorrectedLeakage Average Average

Description Flow Clearance Clearance Wearlb/h in. in. in.

Stage 1 34221 0.070 0.070 0.030Stage 2 8084 0.070 0.070 0.030Stage 3 19188 0.070 0.070 0.030Stage 4 11476 0.070 0.070 0.030Stage 5 2142 0.070 0.070 0.030Stage 6 9420 0.070 0.070 0.030Stage 7 11474 0.070 0.070 0.030Stage 8 14036 0.070 0.070 0.030Stage 9 12231 0.070 0.070 0.030

Audit Results: Unit #4 Steam Path Audit Results 3-07: Root Spill Strips : LP Casing

No results to report.

Audit Results: Unit #4 Steam Path Audit Results 3-07: Tip Spill Strips : Totals


Btu/kWh $IP Casing 11.9 31489.55HP Casing 21.2 56282.73LP Casing 9.5 25097.62Turbine Total 42.80 113387



Audit Results: Unit #4 Steam Path Audit Results 3-07: Tip Spill Strips : IP Casing



Stage 13 20850 0.072 0.072 0.022 0.92 1.96 5183Stage 12 19292 0.057 0.057 0.007 0.43 0.82 2159Stage 11 10712 0.029 0.029 -0.021 -0.86 -1.51 -3992Stage 10 72090 0.160 0.160 0.110 6.64 10.62 28132Total 11.89 31490

Audit Results: Unit #4 Steam Path Audit Results 3-07: Tip Spill Strips : HP Casing



Stage 1 83492 0.053 0.053 0.013 1.97 3.71 9829Stage 2 49824 0.029 0.029 -0.011 -1.20 -2.05 -5441Stage 3 81603 0.054 0.054 0.014 1.89 3.46 9162Stage 4 63342 0.047 0.047 0.007 1.00 1.98 5248Stage 5 79013 0.068 0.068 0.028 2.69 5.78 15305Stage 6 67172 0.068 0.068 0.028 2.30 5.39 14288Stage 7 35710 0.054 0.054 0.014 1.04 1.42 3754Stage 8 31177 0.051 0.051 0.011 0.78 1.15 3039Stage 9 22260 0.042 0.042 0.002 0.21 0.33 882Total 21.25 56283



Audit Results: Unit #4 Steam Path Audit Results 3-07: Tip Spill Strips : LP Casing



Stage 1 31363 0.128 0.128 0.028 0.85 1.16 3078Stage 2 25690 0.111 0.111 0.010 0.30 0.45 1196Stage 3 23133 0.107 0.107 0.007 0.20 0.32 855Stage 4 25391 0.131 0.131 0.031 0.74 1.33 3521Stage 5 27453 0.144 0.144 0.044 1.04 2.11 5579Stage 6 24093 0.137 0.137 0.037 0.81 1.86 4927Stage 7 23602 0.139 0.139 0.039 0.82 2.29 6068Stage 8 7087 0.110 0.110 -0.000 -0.00 -0.02 -50Stage 9 1604 0.100 0.100 -0.000 -0.00 -0.04 -102Total 9.47 25098

Audit Results: Unit #4 Steam Path Audit Results 3-07: Shaft End Packings : Totals


Btu/kWh $IP Casing 3.16 8361HP Casing 37.01 98044LP Casing 3.27 8654Turbine Total 43.53 115305

Audit Results: Unit #4 Steam Path Audit Results 3-07: Shaft End Packings : IP Casing

CorrectedPacking Leakage Average Average Change In First YearDescription Seal Flow Clearance Clearance Wear G.T.H.R. Fuel Cost

lb/h in. in. in. Btu/kWh $IP Exhaust (N1) 1 1566 0.047 0.047 0.032 3.04 8046

2 250 0.032 0.032 0.017 0.12 314Total 3.16 8361

Total 3.16 8361



Audit Results: Unit #4 Steam Path Audit Results 3-07: Shaft End Packings : HP Casing


lb/h in. in. in. Btu/kWh $HP Inlet (N2) 1 34671 0.040 0.040 0.025 27.97 74099

Total 27.97 74099HP Exhaust (N3) 1 6955 0.046 0.046 0.031 7.81 20683

2 1102 0.044 0.044 0.029 1.11 2940Total 8.92 23630

Total 37.01 98044

Audit Results: Unit #4 Steam Path Audit Results 3-07: Shaft End Packings : LP Casing


lb/h in. in. in. Btu/kWh $LP Inlet (N4) 2 1608 0.031 0.031 0.006 1.67 4418

1 1936 0.034 0.034 0.009 0.39 1043Total 2.06 5462

LP Exhaust (N5) 1 -925 0.055 0.055 0.030 0.63 16812 832 0.038 0.038 0.013 0.57 1509Total 1.20 3191

Total 3.27 8654



Audit Results: Unit #4 Steam Path Audit Results 3-07: Steam Seal System :

LeakageFlow

Description lb/hHP Casing HP Exhaust (N3) 1102IP Casing IP Exhaust (N1) 1316LP Casing LP Inlet (N4) 1608LP Casing LP Exhaust (N5) -1757Additional Flow (User Input) 0Steam Seal System Net Flow 2269

Change In First YearG.T.H.R. Fuel CostBtu/kWh $

SSS Supplemental Flow Loss 0.00 0

Audit Results: Unit #4 Steam Path Audit Results 3-07: Solid Particle Erosion : IP Casing

Stationary Blade Rotating BladeArea Leading Edge Area

Description Change Coefficient Change% 0.0-1.0 %

Stage 13 0.0 0.000 0.0Stage 12 0.0 0.000 0.0Stage 11 0.0 0.000 0.0Stage 10 0.0 0.000 0.0



Audit Results: Unit #4 Steam Path Audit Results 3-07: Solid Particle Erosion : HP Casing



Stage 1 0.0 0.000 0.0Stage 2 0.0 0.038 0.0Stage 3 0.0 0.000 0.0Stage 4 0.0 0.000 0.0Stage 5 0.0 0.000 0.0Stage 6 0.0 0.000 0.0Stage 7 0.0 0.000 0.0Stage 8 0.0 0.000 0.0Stage 9 0.0 0.000 0.0

Audit Results: Unit #4 Steam Path Audit Results 3-07: Solid Particle Erosion : LP Casing



Stage 1 0.0 0.000 0.0Stage 2 0.0 0.000 0.0Stage 3 0.0 0.000 0.0Stage 4 0.0 0.000 0.0Stage 5 0.0 0.000 0.0Stage 6 0.0 0.000 0.0Stage 7 0.0 0.000 0.0Stage 8 0.0 0.000 0.0Stage 9 0.0 0.000 0.0



Audit Results: Unit #4 Steam Path Audit Results 3-07: Blade Deposits : IP Casing

Stationary Blade Rotating BladeDescription Area Change Area Change

% %Stage 13 0.0 0.0Stage 12 0.0 0.0Stage 11 0.0 0.0Stage 10 0.0 0.0

Audit Results: Unit #4 Steam Path Audit Results 3-07: Blade Deposits : HP Casing


% %Stage 1 -4.2 -7.5Stage 2 -21.9 -7.9Stage 3 -11.6 -10.5Stage 4 -17.6 -10.5Stage 5 -15.3 -7.9Stage 6 -13.7 -6.8Stage 7 -14.9 -6.8Stage 8 0.0 0.0Stage 9 -12.8 -6.7

Audit Results: Unit #4 Steam Path Audit Results 3-07: Blade Deposits : LP Casing


% %Stage 1 -2.1 -2.2Stage 2 -1.6 -1.8Stage 3 -1.1 -4.3Stage 4 -1.6 -4.4Stage 5 -1.6 -5.8Stage 6 -1.8 -2.9Stage 7 -1.9 -3.0Stage 8 -2.2 -4.8Stage 9 -1.9 -0.3



Audit Results: Unit #4 Steam Path Audit Results 3-07: Foreign Object Damage : IP Casing


% %Stage 13 0.0 0.0Stage 12 0.0 0.0Stage 11 0.0 0.0Stage 10 0.0 0.0

Audit Results: Unit #4 Steam Path Audit Results 3-07: Foreign Object Damage : HP Casing


% %Stage 1 0.0 0.0Stage 2 0.0 0.0Stage 3 0.0 0.0Stage 4 0.0 0.0Stage 5 0.0 0.0Stage 6 0.0 0.0Stage 7 0.0 0.0Stage 8 0.0 0.0Stage 9 0.0 0.0

Audit Results: Unit #4 Steam Path Audit Results 3-07: Foreign Object Damage : LP Casing


% %Stage 1 0.0 0.0Stage 2 0.0 0.0Stage 3 0.0 0.0Stage 4 0.0 0.0Stage 5 0.0 0.0Stage 6 0.0 0.0Stage 7 0.0 0.0Stage 8 0.0 0.0Stage 9 0.0 0.0



Audit Results: Unit #4 Steam Path Audit Results 3-07: Flow Path Damages : Totals


Btu/kWh $IP Casing 0.00 0HP Casing 52.86 140022LP Casing 21.19 56140

Flow Change Impact 0.00 0Turbine Total 83.08 220091

Audit Results: Unit #4 Steam Path Audit Results 3-07: Flow Path Damages : IP Casing

Stationary Blade Rotating Blade StageArea Damage Leading Area Damage Efficiency Change In First Year

Description Change Coefficient Coefficient Change Coefficient Loss G.T.H.R. Fuel Cost% 0.0-1.0 0.0-1.0 % 0.0-1.0 % Btu/kWh $

Stage 13 0.0 0.00 0.000 0.0 0.00 0.00 0.00 0Stage 12 0.0 0.00 0.000 0.0 0.00 0.00 0.00 0Stage 11 0.0 0.00 0.000 0.0 0.00 0.00 0.00 0Stage 10 0.0 0.00 0.000 0.0 0.00 0.00 0.00 0Total 0.00 0

Audit Results: Unit #4 Steam Path Audit Results 3-07: Flow Path Damages : HP Casing



Stage 1 -2.2 0.23 0.000 -7.5 0.10 0.67 1.71 4536Stage 2 -19.9 0.13 0.038 -7.9 0.10 4.65 10.45 27694Stage 3 -9.6 0.16 0.000 -10.5 0.10 1.56 3.60 9548Stage 4 -15.6 0.14 0.000 -10.5 0.10 3.72 9.03 23909Stage 5 -13.3 0.15 0.000 -7.9 0.10 3.11 7.79 20637Stage 6 -11.8 0.15 0.000 -6.8 0.10 3.07 8.02 21246Stage 7 -12.9 0.15 0.000 -6.8 0.10 3.76 5.54 14677Stage 8 2.0 0.50 0.000 0.0 0.00 1.29 1.98 5245Stage 9 -12.8 0.10 0.000 -6.7 0.10 2.63 4.17 11050Total 52.86 140022



Audit Results: Unit #4 Steam Path Audit Results 3-07: Flow Path Damages : LP Casing



Stage 1 -2.1 0.10 0.000 -2.2 0.10 0.21 0.29 775Stage 2 -1.6 0.10 0.000 -1.8 0.10 0.21 0.32 843Stage 3 -1.1 0.10 0.000 -4.3 0.10 0.21 0.33 885Stage 4 -1.6 0.10 0.000 -4.4 0.10 0.12 0.20 543Stage 5 -1.6 0.10 0.000 -5.8 0.10 0.13 0.23 598Stage 6 -1.8 0.10 0.000 -2.9 0.10 0.18 0.34 910Stage 7 -1.9 0.10 0.000 -3.0 0.10 0.26 0.56 1478Stage 8 -2.2 0.10 0.000 -4.8 0.10 1.18 5.78 15316Stage 9 -1.9 0.10 0.000 -0.3 0.10 1.96 13.08 34641Total 21.19 56140

Audit Results: Unit #4 Steam Path Audit Results 3-07: Surface Roughness : Totals


Description Btu/kWh $IP Casing 7.50 19879HP Casing 111.28 294796LP Casing 30.20 79995Turbine Total 150.59 398929

Audit Results: Unit #4 Steam Path Audit Results 3-07: Surface Roughness : IP Casing

StageEfficiency Change In First Year

Description Loss G.T.H.R. Fuel Cost% Btu/kWh $

Stage 13 0.84 1.80 4762Stage 12 0.84 1.62 4280Stage 11 0.89 1.56 4124Stage 10 1.58 2.53 6699Total 7.50 19879



Audit Results: Unit #4 Steam Path Audit Results 3-07: Surface Roughness : HP Casing



Stage 1 5.32 10.04 26595Stage 2 9.97 17.08 45240Stage 3 7.54 13.80 36564Stage 4 5.60 11.16 29576Stage 5 6.86 14.76 39103Stage 6 7.10 16.67 44150Stage 7 6.60 9.04 23956Stage 8 7.37 10.91 28909Stage 9 3.34 5.32 14081Total 111.28 294796

Audit Results: Unit #4 Steam Path Audit Results 3-07: Surface Roughness : LP Casing



Stage 1 -0.00 -0.00 -0Stage 2 0.14 0.20 536Stage 3 0.47 0.77 2031Stage 4 1.06 1.90 5027Stage 5 2.32 4.72 12500Stage 6 1.50 3.44 9123Stage 7 0.92 2.57 6803Stage 8 1.50 12.10 32053Stage 9 0.36 4.41 11682Total 30.20 79995



Audit Results: Unit #4 Steam Path Audit Results 3-07: Trailing Edge Thickness : Totals



Audit Results: Unit #4 Steam Path Audit Results 3-07: Trailing Edge Thickness : IP Casing



Stage 13 -0.00 -0.00 -0Stage 12 0.51 0.98 2588Stage 11 0.54 0.95 2508Stage 10 1.42 2.27 6015Total 4.20 11114

Audit Results: Unit #4 Steam Path Audit Results 3-07: Trailing Edge Thickness : HP Casing



Stage 1 0.00 0.00 0Stage 2 0.34 0.59 1550Stage 3 0.19 0.35 932Stage 4 0.00 0.00 0Stage 5 0.30 0.65 1709Stage 6 0.00 0.00 0Stage 7 -0.00 -0.00 -0Stage 8 -0.00 -0.00 -0Stage 9 0.37 0.59 1551Total 2.17 5744



Audit Results: Unit #4 Steam Path Audit Results 3-07: Trailing Edge Thickness : LP Casing



Stage 1 1.06 1.45 3847Stage 2 -0.00 -0.00 -0Stage 3 0.36 0.59 1560Stage 4 0.31 0.56 1494Stage 5 0.00 0.00 0Stage 6 0.00 0.00 0Stage 7 0.16 0.44 1176Stage 8 -0.14 -1.10 -2911Stage 9 0.00 0.00 0Total 1.95 5166

Audit Results: Unit #4 Steam Path Audit Results 3-07: Cover Deposits : Totals



Audit Results: Unit #4 Steam Path Audit Results 3-07: Cover Deposits : IP Casing



Stage 13 0.40 0.85 2244Stage 12 0.97 1.85 4910Stage 11 0.76 1.33 3525Stage 10 0.00 0.00 0Total 4.03 10682



Audit Results: Unit #4 Steam Path Audit Results 3-07: Cover Deposits : HP Casing




Audit Results: Unit #4 Steam Path Audit Results 3-07: Cover Deposits : LP Casing






Audit Results: Unit #4 Steam Path Audit Results 3-07: Interstage Packings: Graphs : IP Casing

IP Casing Average ClearanceLegendDes Avg Clr

Clearance (in.)

Stage

10Sta

ge 11

Stage

12Sta

ge 13

0.000

0.100

0.020

0.040

0.060

0.080

Meas Avg Clr

IP Casing Horizontal ClearanceLegendDesign Clr

Clearance (in.)

Stage

10Sta

ge 11

Stage

12Sta

ge 13

0.000

0.100

0.020

0.040

0.060

0.080

Left ClrRight Clr

IP Casing Vertical ClearanceLegendDesign Clr

Clearance (in.)

Stage

10Sta

ge 11

Stage

12Sta

ge 13

0.000

0.100

0.020

0.040

0.060

0.080

Top ClrBottom Clr

LegendDesignMeas Variance

IP Casing Horizontal Gap Variance

Right (in.) Left

Stage

10Sta

ge 11

Stage

12Sta

ge 13

-0.050

0.050

0.000

-0.025

0.025

eSTPE™ 7.7 3/31/2007 12:00PM Page 1 S.T.E.A.M., INC.


Audit Results: Unit #4 Steam Path Audit Results 3-07: Interstage Packings: Graphs : HP Casing

HP Casing Average ClearanceLegendDes Avg Clr

Clearance (in.)

Stage

2Sta

ge 3

Stage

4Sta

ge 5

Stage

6Sta

ge 7

Stage

8Sta

ge 9

0.000

0.100

0.020

0.040

0.060

0.080

Meas Avg Clr

HP Casing Horizontal ClearanceLegendDesign Clr

Clearance (in.)

Stage

2Sta

ge 3

Stage

4Sta

ge 5

Stage

6Sta

ge 7

Stage

8Sta

ge 9

0.000

0.100

0.020

0.040

0.060

0.080

Left ClrRight Clr

HP Casing Vertical ClearanceLegendDesign Clr

Clearance (in.)

Stage

2Sta

ge 3

Stage

4Sta

ge 5

Stage

6Sta

ge 7

Stage

8Sta

ge 9

0.000

0.100

0.020

0.040

0.060

0.080

Top ClrBottom Clr


HP Casing Horizontal Gap Variance

Right (in.) Left

Stage

2Sta

ge 3

Stage

4Sta

ge 5

Stage

6Sta

ge 7

Stage

8Sta

ge 9

-0.100

0.100

0.000

-0.050

0.050



Audit Results: Unit #4 Steam Path Audit Results 3-07: Interstage Packings: Graphs : LP Casing

LP Casing Average ClearanceLegendDes Avg Clr

Clearance (in.)

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

90.000

0.150

0.030

0.060

0.090

0.120

Meas Avg Clr

LP Casing Horizontal ClearanceLegendDesign Clr

Clearance (in.)

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

90.000

0.150

0.030

0.060

0.090

0.120

Left ClrRight Clr

LP Casing Vertical ClearanceLegendDesign Clr

Clearance (in.)

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

90.000

0.150

0.030

0.060

0.090

0.120

Top ClrBottom Clr


LP Casing Horizontal Gap Variance

Right (in.) Left

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

9-0.050

0.050

0.000

-0.025

0.025



Audit Results: Unit #4 Steam Path Audit Results 3-07: Tip Spill Strips: Graphs : IP Casing


Clearance (in.)

Stage

10Sta

ge 11

Stage

12Sta

ge 13

0.000

0.300

0.060

0.120

0.180

0.240

Meas Avg Clr


Clearance (in.)

Stage

10Sta

ge 11

Stage

12Sta

ge 13

0.000

0.300

0.060

0.120

0.180

0.240

Left ClrRight Clr


Clearance (in.)

Stage

10Sta

ge 11

Stage

12Sta

ge 13

0.000

0.300

0.060

0.120

0.180

0.240

Top ClrBottom Clr



Right (in.) Left

Stage

10Sta

ge 11

Stage

12Sta

ge 13

-0.100

0.100

0.000

-0.050

0.050



Audit Results: Unit #4 Steam Path Audit Results 3-07: Tip Spill Strips: Graphs : HP Casing


Clearance (in.)

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

90.000

0.100

0.020

0.040

0.060

0.080

Meas Avg Clr


Clearance (in.)

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

90.000

0.100

0.020

0.040

0.060

0.080

Left ClrRight Clr


Clearance (in.)

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

90.000

0.100

0.020

0.040

0.060

0.080

Top ClrBottom Clr



Right (in.) Left

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

9-0.100

0.100

0.000

-0.050

0.050



Audit Results: Unit #4 Steam Path Audit Results 3-07: Tip Spill Strips: Graphs : LP Casing


Clearance (in.)

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

90.000

0.200

0.040

0.080

0.120

0.160

Meas Avg Clr


Clearance (in.)

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

90.000

0.200

0.040

0.080

0.120

0.160

Left ClrRight Clr


Clearance (in.)

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

90.000

0.200

0.040

0.080

0.120

0.160

Top ClrBottom Clr



Right (in.) Left

Stage

1Sta

ge 2

Stage

3Sta

ge 4

Stage

5Sta

ge 6

Stage

7Sta

ge 8

Stage

9-0.200

0.200

0.000

-0.100

0.100



Audit Results: Unit #4 Steam Path Audit Results 3-07: Shaft End Packings: Graphs : IP Casing


IP Exhaust (N1)

Clearance (in.)

S1R1

S1R2

S1R3

S1R4

S1R5

S2R1

0.000

0.100

0.020

0.040

0.060

0.080

Meas Avg Clr


IP Exhaust (N1)

Clearance (in.)

S1R1

S1R2

S1R3

S1R4

S1R5

S2R1

0.000

0.100

0.020

0.040

0.060

0.080

Left ClrRight Clr


IP Exhaust (N1)

Clearance (in.)

S1R1

S1R2

S1R3

S1R4

S1R5

S2R1

0.000

0.100

0.020

0.040

0.060

0.080

Top ClrBottom Clr



IP Exhaust (N1)

Right (in.) Left

S1R1

S1R2

S1R3

S1R4

S1R5

S2R1

-0.050

0.050

0.000

-0.025

0.025



Audit Results: Unit #4 Steam Path Audit Results 3-07: Shaft End Packings: Graphs : HP Casing


HP Inlet (N2) and HP Exhaust (N3)

Clearance (in.)

S1R1

S1R2

S1R3

S1R4

S1R1

S1R2

S1R3

S1R4

S2R1

0.000

0.100

0.020

0.040

0.060

0.080

Meas Avg Clr



Clearance (in.)

S1R1

S1R2

S1R3

S1R4

S1R1

S1R2

S1R3

S1R4

S2R1

0.000

0.100

0.020

0.040

0.060

0.080

Left ClrRight Clr



Clearance (in.)

S1R1

S1R2

S1R3

S1R4

S1R1

S1R2

S1R3

S1R4

S2R1

0.000

0.100

0.020

0.040

0.060

0.080

Top ClrBottom Clr




Right (in.) Left

S1R1

S1R2

S1R3

S1R4

S1R1

S1R2

S1R3

S1R4

S2R1

-0.050

0.050

0.000

-0.025

0.025



Audit Results: Unit #4 Steam Path Audit Results 3-07: Shaft End Packings: Graphs : LP Casing


LP Inlet (N4) and LP Exhaust (N5)

Clearance (in.)

S1R1

S1R2

S1R3

S1R4

S1R5

S2R1

S1R1

S2R1

0.000

0.100

0.020

0.040

0.060

0.080

Meas Avg Clr



Clearance (in.)

S1R1

S1R2

S1R3

S1R4

S1R5

S2R1

S1R1

S2R1

0.000

0.100

0.020

0.040

0.060

0.080

Left ClrRight Clr



Clearance (in.)

S1R1

S1R2

S1R3

S1R4

S1R5

S2R1

S1R1

S2R1

0.000

0.100

0.020

0.040

0.060

0.080

Top ClrBottom Clr




Right (in.) Left

S1R1

S1R2

S1R3

S1R4

S1R5

S2R1

S1R1

S2R1

-0.050

0.050

0.000

-0.025

0.025


1st Stage HP Nozzle as Found.

1sr Stage HP Nozzle Showing Coating Buildup and Damaged Spill Strip.

2nd Stage HP Diaphragm as Found.

3rd Stage HP Diaphragm as Found.

4th Stage HP Diaphragm as Found.


9th Stage LP, Diaphragm as Found.

1st Stage HP Buckets, Admission Side of Vane Section. Note Coating Buildup.

1st Stage HP Bucket Outer Cover, Integral Cover and Tenons.

1st Stage HP Buckets, Exhaust Side of Vane Section. Note Coating Buildup.

2nd Stage HP Buckets, Ad. Side of Vane Section. Note Coating Buildup and FOD.

2nd Stage HP Bucket Covers and Tenons. Heavy FOD on Tenons and Cover OD.

2nd Stage HP Buckets, Exhaust Side of Vane Section. Note Coating Buildup.

3rd Stage HP Buckets, Admission Side of Vane Section. Note Coating Buildup.

3rd Stage HP Bucket Covers and Tenons. Moderate FOD on Tenons and Cover OD.

3rd Stage HP Buckets, Exhaust Side of Vane Section. Note Coating Buildup.

4th Stage HP Buckets, Admission Side of Vane Section. Note Coating Buildup.

4th Stage HP Bucket Covers and Tenons. Note heavy FOD.

4th Stage HP Buckets, Exhaust Side of Vane Section. Note Coating Buildup.

5th Stage HP Buckets, Admission Side of Vane Section. Note Coating Buildup and FOD.

6th Stage HP Buckets, Admission Side of Vane Section. Minor FOD.

6th Stage HP Bucket Covers and Tenons. Moderate FOD on Tenons and Cover OD.


7th Stage HP Buckets, Admission Side of Vane Section. Minor FOD, Coating Buildup.

8th Stage HP Buckets, Admission Side of Vane Section. Minor FOD and Light Coating.

8th Stage HP Bucket Covers and Tenons. Moderate FOD on Tenons and Cover OD.


9th Stage HP Buckets, Admission Side of Vane Section. Minor FOD.

9th Stage HP Bucket Covers and Tenons. FOD on Tenons and Cover OD.


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