TG507 - (GE) MHC Steam Turbine Controls

4.5 days - 2.9 Continuing Education Units Awarded

The Mechanical Hydraulic Control System supplied with General Electric 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.

OBJECTIVES
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/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.

UNSOLICITED COMMENT RECEIVED ON RECENT COURSE DELIVERIES

"Great Class.  The class met my expectations, gave me a much better understanding and working knowledge." Aug'02.

"Instructor was excellent.  Course was very smooth and paced appropriately."  Aug'02.

"Helped with better understanding what was going on with this system."  Aug'02.

"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."  Sep'03.

"Instructor was knowledgeable about factory and field conditions."  Sep'03.

COURSE OUTLINE

1. Introduction
2. 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
3. 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
4. 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)
5. 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
6. 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, Trip Anticipator
7. BWR Turbine Controls:  Mechanical Pressure Regulator, Electric Pressure Regulator, Intercept Valve Transmittal/Receiver Relays
8. 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
9. Adjustments and Problem Solving: Keeping Out of Control Trouble, Control System Trouble-Shooting, Safety Rules of MHC Work, Basic Rules for Adjusting, Setting Instructions
10. Course Conclusion

Note:  Advanced special arrangements are required to include discussions on the Forced Restored Pressure Regulator and the Electric Pressure Regulator.

Satisfied Clients include: AmerGen (Oyster Creek Nuclear Station), Commonwealth Edison, Constellation Nuclear (9 Mile Point), Consumers Energy, Detroit Edison, Electric Energy (Joppa Station), Entergy Arkansas (Lake Catherine Plant), Entergy Nuclear Generation (Pilgrim Nuclear Station), Florida Power & Light, Ford Motor Company, Georgia Power, Great River Energy, GPU/Nuclear, New York State Electric & Gas, Niagara Mohawk Power, Ontario Hydro (Lennox and Lambton Stations), PSI Energy, PSE&G, Reliant Energy (Portland and Shawville Stations), Salt River Project, Tennessee Valley Authority (Kingston and Paradise Plants), United Power Associates, Vermont Yankee Nuclear Power.