TAILIEUCHUNG - Heavy-Duty Gas Turbine Operating and Maintenance Considerations

The wedge surfaces between the parallel face disk halves are caused to press together under stem thrust and spread apart the disks to seal against the seats. The tapered wedges may be part of the disk halves or they may be separate elements. The lower wedge may bottom out on a rib at the valve bottom so that the stem can develop seating force. In one version, the wedge contact surfaces are curved to keep the point of contact close to the optimum. In other parallel disk gates, the two halves do not move apart under wedge action. Instead, the upstream pressure holds the downstream disk. | GER-3620J GE Power Systems Heavy-Duty Gas Turbine Operating and Maintenance Considerations Robert Hoeft Jamison Janawitz and Richard Keck GE Energy Services Atlanta GA Heavy-Duty Gas Turbine Operating and Maintenance Considerations Contents Maintenance Gas Turbine Design Maintenance Borescope Major Factors Influencing Maintenance and Equipment Starts and Hours Service Firing Steam Water Cyclic Hot Gas Path Rotor Combustion Off Frequency Air Inlet Maintenance Standby Running Load vs. Exhaust Vibration Fuel Flow and Exhaust Temperature and Spread Start-Up Coast-Down Combustion Inspection .24 Hot-Gas-Path Inspection .25 Major Parts Planning .30 Inspection Intervals .31 Manpower References .37 Acknowledgments .37 Appendix .38 List of GE Power Systems GER-3620J 01 03

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