Design and Test of a Large Two-Shaft Gas Turbine

The largest two-shaft gas turbine in the United States has been operated in combined cycle service at the Oklahoma Gas and Electric Company Horseshoe Lake Station since May 1963. The same design unit has been operated in peaking and stand-by service at Public Service Electric and Gas (Essex, N. J.) station since December 1963. The O.G & E. unit has a NEMA rating of 25 Mw base load. The PSEG unit has a NEMA peaking rating of 29 Mw. The paper describes the design features of this unit and a method of testing the high-pressure set and variable second-stage nozzle under full-load conditions without actually loading the load turbine.