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    GE Frame 7 Turbine VIGV issue

    Good Day, There is an issue with our GE frame 7 gas turbine. The VIGV goes fully open at (84 deg) at 66 MW's. The machine is rated for 75 MW's . We are in the tropics so on a hot day we normally get 71 MW's (at 84degF) and 74 MW's (77degF) at night. What cause the VIGV to go fully open at...