TIL 1214-3R3

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TIL 1214-3R3GE ENERGY SERVICES TECHNOLOGYCUSTOMER TECHNOLOGY SERVICES

19 MAY 2005

Compliance Category - C

Timing Code - 5

TECHNICAL INFORMATION LETTER

COPYRIGHT 2005 GEThe information published in this Technical Information Letter is offered to you by GE in consideration of its ongoing sales and service relationshipwith your organization. However, since the operation of your plant involves many factors not within our knowledge, and since operation of the plantis in your control and ultimate responsibility for its continuing successful operation rests with you, GE specifically disclaims any responsibility forliability based on claims for damage of any type, i.e. direct, consequential or special that may be alleged to have been incurred as result of applyingthis information regardless of whether it is claimed that GE is strictly liable, in breach of contract, in breach of warranty, negligent, or is in other

respects responsible for any alleged injury or damage sustained by your organization as a result of applying this information.

6B, 6C, 6FA, 6FA+E, 7F, 7FA, 7FA+, 7FA+E, 7FB, 7H, 9F, 9FA, 9FA+, 9FA+E, 9FB, AND 9HBUCKET LOCKWIRE DOWEL PIN ASSEMBLY PROCEDURE AND LOCKWIRE INSPECTION

APPLICATION6B, 6C, 6FA, 6FA+e, 7F, 7FA, 7FA+, 7FA+e, 7FB, 7H, 9F, 9FA, 9FA+, 9FA+e, 9FB, and 9H units

PURPOSETo provide assembly procedure for bucket lockwire dowel pins and recommend inspection of bucket lockwires

REASON FOR REVISION

To include the 6C, 6FA+e, 7FA+e, 7FB, 7H, 9FA+e, 9FB, and 9H and update the affected units list (AUL)

GLOSSARY OF TERMSCompliance Category

O - Optional Identifies changes that may be beneficial to some, but not necessarily all,operators. Accomplishment is at customer's discretion.

M - Maintenance Identifies maintenance guidelines or best practices for reliable equipmentoperation.

C - Compliance Required Identifies the need for action to correct a condition that, if left uncorrected,may result in reduced equipment reliability, efficiency, or safety.

Compliance may be required within a specific operating time.

A - Alert / Safety Failure to comply with the TIL could result in equipment damage, facilitydamage, or personal injury. Compliance is mandated within a specificoperating time.

Timing Code

1 Prior to Unit Startup / Prior to Continued Operation (forced outage condition)

2 At First Opportunity (next shutdown)

3 Prior to Operation of Affected System

4 At First Exposure of Component

5 At Scheduled Component Part Repair or Replacement

6 Next Scheduled Outage

7 Optional

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BACKGROUND DISCUSSIONThe function of the hot gas path section of a gasturbine is to provide the power required to drive thecompressor and the generator or mechanical drive.The power is generated through two (2), three (3), orfour (4) stages of turbine buckets depending on theparticular machine.

Turbine buckets in stages one (1) and two (2) of 6Bunits, all three (3) stages of 6C units, all three (3) stagesof F class units, and all four (4) stages of H class unitsare positioned and retained axially by snap-ring typelockwires. These lockwires are held in the proper radialposition by dowel pins assembled in the turbine wheeldovetail hooks (see Figure 1). The turbine wheeldovetail hook is staked to retain the dowel pin.

Figure 1: Dowel pin assembly illustration

Recently, a forced outage was caused by improperstaking of a dowel pin. The pin fell out during normaloperation, which allowed the lockwire to fall from thelockwire groove. A portion of the buckets was nolonger constrained axially and the buckets movedforward on the turbine wheel during low speedoperation. This forward motion resulted in the damageas seen in Figure 2.

Figure 2: Damage Resulting from ImproperlyStaked Dowel Pin

Similar damage can occur to the turbine section if thelockwire is not the proper shape prior to installation.Lockwires must be inspected for any defects prior tobucket installation.

RECOMMENDATIONS

Following the recommendations in this TIL can preventbucket damage and/or a force outage due to improperdowel pin assembly. Perform the following duringoutages where turbine buckets are being installed.

Lockwire Inspection1. Inspect lockwires by laying them flat on the floor.Make sure there are no obstacles that distort themanufactured curves.

2. Check to confirm the lockwire is smoothly curvedfrom end to end. Make sure that there are no sharpbends or kinks.

3. Carefully turn the lockwire over and look again forany bending damage. Lockwires with bends or kinksshould be replaced.

For the distance from the end of the lockwire specifiedbelow, each end of the lockwire should show a sharperradius of curvature.

• 6B – Not Applicable

• 6C

• 15 inches 1st and 2nd stage

• 13 inches 3rd stage

• 6FA and 6FA+e – 14 inches

• 7F, 7FA, 7FA+, 7FA+e, and 7FB – 20 inches

• 7H – 24 inches

• 9F, 9FA, 9FA+, 9FA+e, 9FB – 24 inches

• 9H – 24 inches

Dowel Pin AssemblyTable 1 identifies the part number and quantity ofdowel pins to be used for the various frame sizes. Afterthe buckets are assembled onto the turbine wheel andthe lockwire is pressed into the groove, install the

dowel pins. Install the dowel pins around the turbinewheel relative to the lockwire overlap positions (seeFigures 3 through 9). Ensure that the dowel pins areseated below the lockwire and the turbine wheeldovetail hook is staked properly to retain the dowel pin(see Figure 1).

The lockwire inspection and dowel pin assembly arepart of normal bucket installation process and will notadd additional time to the outage. Contact yourEnergy Services Representative for further assistance,if necessary.

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Table 1: Lockwire and Dowel Pin Part Numbers

4

10

12

14

14

14

14

10

Dowel Pins

(8 Total)

Wire Overlap

Bucket dovetailspacing between

dowel pins

Figure 3: 6B Dowel Pin Diagram

5

5

5

5

5

5

5

5

Dowel Pins

(12 Total)

Wire Overlap


dowel pins

5

5

5

5

Figure 4: 6C Stage One (1) and Two (2) Dowel PinDiagram

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8

8

8

8

10

8

8

Dowel Pins(11 Total)

Wire Overlap

Bucket dovetail

spacing betweendowel pins

8

8

8

8

Figure 5: 6C Stage Three (3) Dowel Pin Diagram

4

8

12

12

12

12

12

8

Dowel Pins(9 Total)

Wire Overlap


dowel pins

12

4

6

6

8

8

8

6

6

Dowel Pins(13 Total)

Wire Overlap

Bucket dovetail


8

8

8

8

8

Figure 7: 7F, 7FA, 7FA+, 7FA+e, 7FB, 9F, 9FA, 9FA+,9FA+e, and 9FB Dowel Pin Diagram

4

X

X

N

N

N

X

X

Dowel Pins

Wire Overlap


dowel pins

N

N

N

N

N

13863

111064

10642

9861

# of

Pins

NXStage

#

13863

111064

10642

9861

# of

Pins

NXStage

#

Figure 6: 6FA and 6FA+e Dowel Pin Diagram Figure 8: 7H Dowel Pin Diagram

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4

X

N

N

N

N

N

X

Dowel Pins

Wire Overlap

Bucket dovetail


N

N

N

N

N

13843

15664

11642

11641

# of

Pins

NXStage

#

13843

15664

11642

11641

# of

Pins

NXStage

#

Figure 9: 9H Dowel Pin Diagram

PLANNING INFORMATION

Compliance

• Compliance Category: C • Timing Code: 5

Manpower SkillsBucket technician

Parts

Refer to Table 1.

Special Tooling

• Proper staking tools• Proper lockwire installation tools

Reference DocumentsNone

Previous ModificationsNone

Scope of Work

The recommendations in this TIL are within the scopeof the normal bucket installation procedures. Noadditional time is needed.

Contact your local GE Energy Services representativefor assistance or for additional information.

NOTE: If you would like to receive future TILs by email,contact your local GE Energy Services representative forassistance.

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TIL COMPLIANCE RECORDCompliance with this TIL must be entered in local records. GE requests that the customer notify GE upon compliance ofthis TIL.

Complete the following TIL Compliance Record and FAX it to:

TIL Compliance

FAX: (678) 844-3451Toll free FAX: 1-888-896-TILS (1-888-896-8457)

TIL COMPLIANCE RECORD For Internal Records Only #

Site Name: Customer Name:

Customer Contact Information GE Contact Information

Contact Name: Contact Name:

Address: Address:

Email: Email:

Phone: Phone:

FAX: FAX:

Turbine Serial Number(s):

INSTALLED EQUIPMENT TIL Completed Date:

100% TIL Completed:

Description:

Unit Numbers: Part Description: Part Number MLI Number

Comments:

NOTE: If there are any redlined drawings that pertain to this TIL implementation, please FAX the drawings along withthis TIL Compliance Record.

FAX this form to: TIL ComplianceFAX: (678) 844-3451Toll free FAX: 1-888-896-TILS (1-888-896-8457)

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USER SATISFACTION SURVEYGE values your opinions and comments.

GE requests that you complete the User Satisfaction Survey below to help us better serve you with accurate and timelyinformation on your equipment.

Complete the following TIL Compliance Record and FAX it to:

TIL SurveyGE Customer Technology ServicesFAX: (678) 844-6737Toll free FAX: 1-866-604-2668

USER SATISFACTION SURVEY

Serial Number: Date:

1. How many days after TIL issue date did you receive this TIL?

1 - 5 days 6 - 10 days + 10 daysNOTE: If you would like to receive future TILs by email, contact your local GE Energy Services representative for assistance.

Rate the following based on a scale of 1 to 5, where 1 is Excellent and 5 is Poor.

2. Please rate how well this document informed you of the technical issue.

1 2 3 4 5

3. Please rate the overall effectiveness of this TIL.

1 2 3 4 5

Comments / Suggestions:

FAX this form to: TIL SurveyGE Customer Technology ServicesFAX: (678) 844-6737Toll free FAX: 1-866-604-2668

TIL 1214-3R3

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