TG322 – Mechanical Drive Steam Turbine Maintenance

TG322 – Mechanical Drive Steam Turbine Maintenance

2 days - 14 PDH Credits Awarded



This two-day course was developed to provide the attendee with a thorough understanding of the fundamentals of maintenance of small and intermediate sized steam turbines. These STG sets are used in industrial plant powerhouses to provide process steam at various pressures and to produce electricity for plant power consumption, in utility power plants as the drive unit for boiler feed pumps, and the drive device for gas compressors. Industrial plant powerhouse and utility power plant, supervisors, operators, engineers, and maintenance personnel who are concerned with increasing the effectiveness and reducing the cost of steam turbine maintenance outages should attend this course. Attendees will learn the differences between large utility turbine maintenance and maintenance on mechanical drive turbines. Topical Outline includes: Planning, Scheduling and Decision Making; Maintenance of Shells, Casings & Rotors; Journal and Thrust Bearings; Couplings; Steam Valves; Steam Path Alignment; and Job Wrap Up.


At the completion of this course the participant will 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 Dates / Location / Fee

TG322 is offered on-site only.

Course Outline

  1. Introduction
  2. Turbine Fundamentals: Turbine Cycle, Steam Flow, Nozzles and Expansion, Turbine Blading, Impulse Turbines, Reaction Turbines, Comparisons of Impulse vs. Reaction Turbines
  3. Turbine Component Construction: Shells, Casings, Cylinders, Nozzles/Diaphragms, Stationary Blades, Turbine Seals, Turbine Rotors/Spindles, Blades/Buckets, Standards/Pedestals, Bearings, Turning Gear, Main/Auxiliary Steam Valves, Trip Throttle Valves, Control/Governor Valves
  4. Turbine Maintenance:
    1. Disassembly: Shutdown/Cooldown, Lagging, Disassembly Checks, Shell/Cylinder Bolting, Outer/Inner Shell Cylinder Removal, Rotor/Spindle Removal, L/H Removal
    2. Component Cleaning: Grit Blasting, Solvents, Scraping, Stoning/Honing, Strap Lapping, Wire Brushing
    3. Inspection Techniques: Visual, Dye Penetrant, Magnetic Particle, Ultrasonic Testing, Eddy Current Testing
    4. Component Inspections: Rotor/Spindle, Blade/Bucket, Shell/Cylinder, Diaphragm/Stationary Blades, Steam Packing, Bolting
    5. Steam Path Audits: Items to Measure, Procedures, Economic Factors, Repair Decision, Computer Programs
    6. Reassembly: Lubricants, HP Section, Bolt Tightening
  5. Bearing/Coupling Maintenance: Journal Bearings, Thrust Bearing, Couplings
  6. Steam Valve Maintenance: Safety Considerations, Valve Disassembly, Trip/ThrottleValve, Control Valves, Cleaning/Inspection, Valve Assembly
  7. Alignment: Provisions, Alignment Checks, Rotor Position, Joint Opening, Coupling Alignment, Rotor Clearance, Internal Alignment, Internal Alignment Methods, Tight Wire, Mandrel, Laser, Coupling Alignment, Types of Misalignment, Taking Data, Interpretation, Realignment, Making the Move
  8. Course Conclusion: Questions/Answers, Final Exam as Required, Course Critique

Frequently Asked Questions

  • Will HPC Technical Services bring this course to our location for our personnel only? YES, call or email Stephen Parker, for a price quotation.
  • Will HPC Technical Services customize the presentation at our site to suit our particular needs?
  • Is HPC Technical Services' textbook available for purchase as a reference document? No, not at this time.
  • Can HPC Technical Services provide "Technical Assistance" in outage support to include planning, technical direction, procedure writing, etc.? Yes we can.  Call or contact Stephen Parker, for our rate sheets and any further information required.

What you will receive

  1. 1 copy of HPC Technical Services' textbook, TG322, Mechanical Drive Steam Turbine Maintenance,
  2. A "Certificate of Completion" with 14 PDH awarded.