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1.2 NEMA Ratings Early on during the introduction of Industrial Gas Turbines into common use, the National Electrical Manufacturers Association (NEMA) in the United States introduced a Standard based generally on the use of the Gas Turbine as a prime mover driving electrical generators, thus within their sphere of interest. The common Standard used as a basis for the rating of Gas Turbines in the 1960’s was NEMA Standard SM 30-1959. Since NEMA was an American organization, the standard was not metric and had the following basis: A. Inlet air temperature B. Inlet pressure C. Exhaust pressure 80 °F 14.17 psia 14.17 psia The NEMA inlet and exhaust conditions were measured at the compressor inlet flange and the turbine exhaust flange, respectively. Fuel consumption and efficiency were based on the higher heating value (HHV) of the fuel. The above rating conditions essentially equated to a theoretical gas turbine installed at 1,000 feet AMSL, with no inlet air filtration, silencing or ducting, and with no exhaust plenum, heat recovery device, exhaust silencer or discharge stack. With the growing use of the Gas Turbine in the natural gas transportation business in the late 1960’s, and its increasing use outside North America, it became obvious to the industry that a more universal standard was required and it needed to be one which was metric. In April of 1971, all of the NEMA Standards then in use relative to the Industrial Gas Turbine were canceled and this rating system is now only of historical interest. 1.3 Gas Turbine World Ratings The most readily-available and complete listing of industrial gas turbine ratings are published annually in the Gas Turbine World (GTW) Handbook. Gas turbine manufacturers and packagers are invited to provide current data for all their machine configurations, in a form common to all. The GTW asks that the data be provided for natural gas fuel operation at 15 °C and sea level ISO conditions, with suitable account for gear losses and generator efficiencies, but no account for inlet and exhaust losses, nor for auxiliary power requirements, nor for NOx abatement via steam or water injection. For an example, refer to the attached typical listing of Electric Power Gas Turbines from the 1998-99 GTW Handbook. This particular example (page 54) shows both aero-derivative and heavy-duty industrial gas turbine generators. UNDERSTANDING GAS TURBINE PERFORMANCE © Gryphon International Engineering Services Inc. St. Catharines, Ontario, Canada GTPerf_0900 Page 2PDF Image | UNDERSTANDING GAS TURBINE PERFORMANCE
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