TG316 - Steam Turbine Overhauls

3 days - 1.9 Continuing Education Units Awarded

We all want to improve the effectiveness of steam turbine maintenance activities. This course is an important step toward accomplishing this goal. Collectively, we want to:

• REDUCE: Outage Durations, Outage Extensions, Work Duplication, and Rework.
• INCREASE: Outage Intervals, Reliability, Availability, and Productivity.

Extensive "Hands-On" lab exercises are utilized during the entire three-day session. This course is only presented at our new Education/Lab facility in Sarasota, FL due to extensive uses of steam turbine components for practical exercises. We have a small turbine in our shop for this hands-on exercise. It may be small, but all the important variables are represented: disassembly, rigging, visual inspection, non-destructive examination, alignment evaluation, alignment of steam path components, and reassembly.

This course has been designed for steam turbine facility foremen, supervisors, mechanics, engineers, and all other plant personnel who are concerned with increasing the effectiveness and reducing the cost of steam turbine/generator maintenance outages. A thorough understanding of turbine fundamentals is a prerequisite for this course. This basic knowledge may be obtained by "On-Job" experience or by completion of a turbine fundamentals course. (Effective about June 1, 2006, we will have our eTraining Steam Turbine Fundamentals course on-line.)

OBJECTIVES
Upon successful completion of this course the participant should be able to:

1. Describe the major activities associated with turbine maintenance.
2. Identify and define the items of concern related to turbine maintenance activity.
3. Identify the types of defects encountered during turbine maintenance inspections.
4. Identify the relationship between operational effects and maintenance activity.
5. Describe the various inspections performed during disassembly of the turbine.
6. Describe the procedures for cleaning and inspecting the turbine components.
7. Describe the impact of the various types of defects on turbine efficiency and reliability.
8. Describe the criteria used to evaluate turbine component defects.
9. Describe the various repair methods for defective component condition.
10. Describe the details required for an effective steam path audit.
11. Describe the methods used to properly align turbine components.
12. Describe the criteria used to establish unit specific maintenance clearances.

COURSE OUTLINE

1. Introduction
   1. Definition of Maintenance
   2. Maintenance Concern
   3. Types of Defects
   4. Operational Effects
2. Turbine Overhaul
   1. Disassembly
   2. Component Cleaning
   3. Inspection Techniques
   4. Component Inspections
   5. Steam Path Audits
   6. Reassembly
3. Bearing/Coupling Maintenance
4. Steam Valve Maintenance
   1. Safety Considerations
   2. GE Valve Disassembly
   3. W Valve Disassembly
   4. Cleaning/Inspection
   5. Practical Lab Exercises
   6. Valve Assembly
5. Alignment
   1. Provisions
   2. Alignment Checks
   3. Internal Alignment Methods
   4. Special Cases
6. Course Conclusion