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The various columns provide the following information: a) The manufacturer’s model number and/or series designation. b) The first year the unit was available for purchase. c) The ISO Base Load rating, the rating at which it can be operated for at least 6000 hours a year without causing a reduction in the interval between overhauls. d) The gas turbine Heat Rate in btu/kw.hr at the Base Load rating, stated in terms of the lower heating value (LHV) of the fuel e) The ISO Peak Load rating, the output power rating at which it can be operated for up to 2000 hours a year. When considering operation at this rating, consult the OEM carefully to determine what effect this operation would have on the overhaul interval. It is quite possible that a considerable reduction in the period between overhauls would occur. f) The gas turbine Heat Rate in btu/kw.hr at the peak load rating, again stated in terms of the lower heating value (LHV) of the fuel g) The nominal Pressure Ratio across the compressor section of the gas turbine. In general, the higher the pressure ratio, the higher the thermal efficiency of the engine. h) The Mass Flow through the engine at the base load rating. The higher the mass flow, the greater the amount of energy available to be extracted from the exhaust gas by a Heat Recovery Steam Generator (HRSG) to generate steam. i) The Turbine Speed data indicates the speed of the turbine's power output shaft and helps you to deduce more about the package design. In general, most aero-derivative machines will require speed-reduction gearboxes, since they operate at speeds higher than 2-pole or 4-pole generator synchronous speeds (3600 and 1800 rpm respectively for 60 Hz duty, 3000 and 1500 rpm respectively for 50 Hz duty). There are exceptions, including larger aero-derivative machines where the nominal speed of the LP section of the original turbo-fan engine was close enough to 3600 rpm to be used as-is with "minor" modifications, or where the design speed of the power turbine fitted to an industrialized jet engine is deliberately selected to be 3600 rpm. The smaller heavy-duty industrial gas turbines also generally operate above synchronous speeds, and require speed reduction gearboxes. In the larger UNDERSTANDING GAS TURBINE PERFORMANCE © Gryphon International Engineering Services Inc. St. Catharines, Ontario, Canada GTPerf_0900 Page 3PDF Image | UNDERSTANDING GAS TURBINE PERFORMANCE
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