TG302 - Turbine-Generator Alignment Workshop

3 days - 1.9 Continuing Education Units Awarded

Proper alignment of turbine-generator components can be achieved when one has a thorough understanding of the necessary skills and procedures. Improper alignment causes outage extensions, forced outages, loss of efficiency, and in the worst-case catastrophic failure. The person responsible for the turbine outage may have to completely depend on the contractor or OEM representative's recommendations concerning turbine-generator alignment.

This three-day course was developed to provide the attendee with a thorough understanding of the concepts and procedures involved in TG alignment. The course will provide the attendee with the knowledge and practical hands on skills to properly plan, schedule, and administer a TG alignment program. The attendee will also have the skills and knowledge necessary to evaluate alignment recommendations provided by others. Steam turbine generator facility maintenance supervisors, mechanics, engineers, and all other plant personnel who are responsible for turbine-generator maintenance should attend.

Technical content of this course covers material similar to that covered in our Steam Turbine Generator Maintenance course, TG301.  This course, however, utilizes extensive "Hands-On" laboratory exercises on actual turbine components and simulators to reinforce the knowledge gained in the classroom exercises. Alignment methods demonstrated are, tight wire and rim and face method for couplings.  Mandrels and lasers are discussed.

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

1. Describe the impact of various alignment problems on turbine efficiency and reliability.
2. Determine the correct alignment for your turbine-generator.
3. Describe the procedures for collecting and recording critical internal alignment data.
4. Describe the process of evaluating the collected internal alignment data.
5. Calculate and move internal stationary or rotating components to correct for misalignment.
6. Describe the procedure for collecting and recording critical shaft alignment data
7. Describe the process of evaluating the collected shaft alignment data.
8. Calculate and move shafts to correct for misalignment.
9. Describe the advantages and disadvantages of tight-wire, laser, and mandrel alignment.

COURSE OUTLINE

• Day One
  • Introduction
  • Provisions for Alignment: Reference Data, Support Structures, Locating Structures, and Expansion
  • Alignment Checks (Disassembly): Rotor Position, Coupling Alignment, Joint Opening, Shell Arm Loading, Rotor Clearance Measurement (Charting), Shell/Casing Charting (For Tops-Off Alignment), and Diaphragm/Blade Ring Position
  • Diaphragm/Blade Ring Alignment: Tight-Wire Alignment, Wire Set up, Taking Data, Normalized Readings,True Position, Determine Misalignment, Making the Move, Tops On Corrections, Elliptical Bore Corrections, Laser Alignment, Mandrel Alignment, Diaphragm Preliminary Checks, Diaphragm/Blade Ring Moves
• Day Two
  • Internal Alignment Workshop: Hands-On Tight-Wire Alignment Problems, Hands-On Laser Alignment Problems
  • Shaft/Coupling Alignment: Types of Misalignment, Taking Coupling Alignment Data, Data Interpretation, and Diagramming, Calculating Corrections, Making the Move, Calculating Bearing Shim Changes
• Day Three
  • Shaft Alignment Workshop - Hands-On Shaft Alignment Problems
  • Tops-Off Alignment
  • Special Alignment Cases: Sling Checks, Bearing Reaction Checks
  • Course Conclusion