GAS TURBINE CASE STUDY Case Study 2 Gas Turbine Control Valve Varnishing Plant Description: 2 x GE Frame 9FA Gas Turbines 790MW CCGT Power Station (2 x GT / 1 x ST Configuration) 1. Problem Two GE Frame 9FA gas turbines installed in a 790MW Combined Cycle Gas Turbine Power Station were suffering poor reliability and availability due to malfunction and failure of the Moog servo control valves. Sticking servo-valves were causing frequent trips

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