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classes of heavy duty machines, there are both high speed gear-drive machines and synchronous speed direct-drive machines. In the largest frame sizes, most manufacturers deliberately design 3600 rpm single-shaft machines suitable only for direct-drive 60 Hz duty (e.g. GE Frame 7 and Westinghouse W501). Then they may produce a "scaled-up" 3000 rpm direct-drive variation solely for 50 Hz duty (e.g. GE Frame 9 and Westinghouse W701). Or vice versa for European manufacturers. j) The Turbine Inlet Temperature at the base load rating is the average combustor exit temperature into the first stage of the turbine section. The various manufacturers report this number differently, sometimes at the inlet to the 1st stage stationary blade, sometimes at the inlet to the 1st stage rotating blade, or sometimes it is not reported at all (ABB). In general, the higher this temperature, the more efficient the machine, and the more NOx will be produced (in unabated form). k) The Exhaust Temperature together with the mass flow, can be used to calculate the exhaust heat energy available for production of steam from the exhaust gas by an HRSG. The higher this temperature, the higher the steam temperature which can be achieved, without additional supplementary firing. l) Watch the Approximate Weight information given. Some weights will be for the gas turbine engine alone, and some will be for a complete package installation. m) The information in the Approximate L x W x H column similarly must be considered carefully as to whether it is for a complete package or only the gas turbine. n) The Comments column typically lists information about model variants or, for packagers, the manufacturer of the gas turbine. Some manufacturers will provide additional information on steam injected or liquid fuel variations. UNDERSTANDING GAS TURBINE PERFORMANCE © Gryphon International Engineering Services Inc. St. Catharines, Ontario, Canada GTPerf_0900 Page 4PDF Image | UNDERSTANDING GAS TURBINE PERFORMANCE
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