TG507 – (GE) Steam Turbine Mechanical Hydraulic Controls

TG507 – (GE) Steam Turbine Mechanical Hydraulic Controls

5 days - 35 PDH Credits Awarded



Note:  Course is applicable to GE units as well as non-USA manufacturers (Hitachi and Toshiba) of GE designed steam turbines with mechanical hydraulic controls. The Mechanical Hydraulic Control System supplied with GE Steam Turbines has many hundreds of thousands of reliable operating hours. It has been a very effective means of controlling steam turbine speed and load. It has provided years of trouble free operation and will continue to provide reliable service, if it is properly adjusted and maintained. If not maintained properly, it can be the leading cause of forced outages for the steam turbine.  This one-week course was developed to provide the attendee with a thorough understanding of the design, operation, and maintenance of the GE MHC System. Steam turbine-generator facility supervisors, mechanics, engineers, and all other plant personnel who are concerned with proper operation and maintenance of the GE MHC System should attend.
  • "Great Class. The class met my expectations, gave me a much better understanding and working knowledge."
  • "Instructor was excellent. Course was very smooth and paced appropriately."
  • "Helped with better understanding what was going on with this system."
  • "Instructor was knowledgeable about factory and field conditions."
  • "This training is exactly what TGS had in mind when we identified the knowledge deficiency. Experience along with this training will improve our performance on U-1 turbine controls and lower our almost total dependency on the OEM for MHC work.  Goal was to get enough knowledge to supervise the OEM and know why we are doing the things in the calibration procedure."
Typical Topics:  System Overview, MHC Amplifiers and Related Components, Oil System, Overview of Steam Turbine Controls, Speed/Load Control, Reheat Controls, Pressure Control, Protective and Overspeed Systems, Lever Diagrams and Setting Instructions, Troubleshooting.


Upon successful completion of this course the participant should be able to:
  1. Describe the purpose or function of the entire Hydraulic Control System and the features it must have to safely control turbine operation.
  2. Name the major components and sub-systems.
  3. Describe the purpose of each major component and /or sub-system.
  4. Describe how each major component functions within the control system and/or sub-system.
  5. Name and describe the kinds of tools, instructions, drawings, etc. that are required to maintain a particular system.
  6. Describe the general methods and techniques for inspecting, testing, adjusting, and troubleshooting the hydraulic control systems.
  7. Participants will be able to demonstrate the knowledge needed to evaluate the OEM Line-Up procedures to evaluate and recalibrate the various systems.

Course Dates / Location / Fee

See for detail on the course dates / locations / and registration fees. HPC’s 3-4-2 policy applies:  Sign up 3 for the same course/date, pay in advance, and pay for only 2 (the 3rd participant is free)! HPC Technical Services reserves the right to cancel any course/seminar within 10-working days of the scheduled date.  Fees are 100% refunded or credited to another Seminar (clients' choice) if HPC should cancel any Seminar.  HPC is not responsible for non-refundable airline tickets or other travel expenses under any circumstance.

Course Outline


  • MHC System Overview: Control Fundamentals including the Control Loop, Low Value Gate, and Fail Safe Operation.   Steam Turbine MHC System including System Function/ Description and Design Considerations
  • MHC System Components: MHC Amplifiers  --  Function/Description and Design Considerations.   Component Details including Single Acting Integrator, Double Acting Relay, Pilot Valves Principles, Pilot Valve Over-travel, Pilot Valve Balancing, Fully Balanced Double-Acting Pilot Valves, Bleeding Pilot Valve   Limiters and Stops, including Mechanical Stops, Flow Limiters and Dashpots.  Trip-Latch Mechanism, Function Generator


  • Oil Systems: System Function/ Description and Design Considerations, Major Components or Sub-systems to include Booster Pump, Oil Pumps, Oil Coolers, Relief Valve, Oil Reservoir, Vapor Extractor, Bearing Header System Operations (On Turning Gear, At Speed and Shutdown)
  • Overview of Steam Turbine Controls
  • Speed/Load Control: System Function/Description and Design Considerations, Operating Speed Control, Speed Governor and Speed Relay (Design Clearance and Regulation), CV Positioning (Valves on Shell), CV Positioning (Separate Valve Chest), Speed/Load Changer, Load Limit Control, Stop Valve Bypass.  Discussions include upgrade considerations.


  • Reheat Turbine Controls: System Function/Description and Design Considerations, First Line of Defense, Second Line of Defense, Separate Intercept Valves, Shell Mounted Intercept Valves, Separate Reheat Stop Valves, Combined Reheat Valves, Two Speed Governing Systems including Pre-Emergency Governor and Regulation, Single Speed Governing System, Dashpot Breakdown Link, Intercept Valve Transmittal/Receiver Relays, Trip Anticipator
  • BWR Turbine Controls:  Mechanical Pressure Regulator, Electric Pressure Regulator, and Bypass Valves


  • Overspeed Protection and Emergency Trip System: System: System Function/Description, Overspeed Control, Normal Overspeed Operation, Emergency Overspeed, Second Line of Defense, Stop Valves, Emergency Trip Valves, Emergency Governor, Emergency Governor Control, Trip Valves, Manual and Solenoid Trip, Sequential Tripping, Trip Testing System, Vacuum Trip
  • Lever Diagrams and Setting Instructions


  • Adjustments and Problem Solving: Keeping Out of Control Trouble, Control System Trouble-Shooting, Safety Rules of MHC Work, Basic Rules for Adjusting
  • Certification Examination

What you will receive

  1. 1 copy of HPC Technical Services' textbook, (GE) MHC Steam Turbine Controls, a $295 value, as written by Harold Parker. This text contains a significant number of equipment photographs, graphics and data tables.  It is a valuable desktop reference in addition to being able to enhance the learning process.  (This valuable text is available for purchase if you cannot attend – US$295).
  2. A "Certificate of Completion"

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?   $195 + S&H.
  • What is the cost for HPC Technical Service to deliver this course at our location? Well, of course that can vary, but generally speaking, if you're planning on having 6+ attend, when considering your T&L, it is to your advantage to perform the course at your plant (office).  You gain from the customization and price.
  • Can HPC Technical Services perform a functional checkout and calibration of your control system during the upcoming outage OR provide troubleshooting support should it be required? Yes we can.  Call or contact Stephen Parker, for our rate sheets and any further information required.
  • Can HPC Technical Services provide recommendations and support upgrade considerations?   Call or contact Stephen Parker,, for discussion.

Steam Turbine I&C Maintenance Certification

Those who attend this course are automatically qualified to take HPC Technical Services' Certification Examination.  This examination is offered at no additional expense to the participant.  An 80% passing grade is required.  The examination length will not exceed 2-hours.  Those who complete this examination will receive a revised "certificate of completion" that recognizes this accomplishment along with two-copies of a "To Whom It May Concern" letter that states their accomplishment.  (Two copies are provided, one for the participants' employer and one for the participants' personal file.)  Consult HPC's website,, for detail on this certification program.