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change in exhaust backpressure due to exhaust system/HRSG fouling. A gas turbine in the "new and clean" condition will produce the maximum power, at the best efficiency. Manufacturers and vendors will usually contractually define a gas turbine as "new and clean" for only the first 100~250 hours of operation, usually long enough to complete the initial site commissioning and to perform the on-site performance test. After initial installation and testing, the closest that an installation with considerable operating hours will come back to "new and clean" is immediately after a complete major overhaul and cleaning. 2.2.2 ExpectedPerformance When a vendor states that they are supplying "expected" performance for a gas turbine or GTG package, they generally mean the data represents the average or mean of the many production line models they have produced. Depending upon the stackup of tolerances during manufacturing, the purchaser may actually get an engine which performs better or worse than the "expected" performance. 2.2.3 GuaranteedPerformance When a contract for a GTG package is executed, the Vendor will guarantee the performance of the "new and clean" package at a specific set of "Guarantee Reference Conditions", including barometric pressure (representing the site altitude), ambient temperature and humidity, inlet loss and exhaust loss, fuel temperature and composition. During the on-site performance test, the actual operating conditions may be significantly different than the "reference" conditions, and test results will be corrected back to "reference" by using pre-agreed test correction curves and/or computer models. Since the Purchaser's contract will include liquidated damages for any lack of performance, the Vendor's stated "Guarantee Performance" will always be lower than the "Expected Performance", in order to protect himself. The typical power output difference between a Vendor's expected and guaranteed performance, at a specific ambient temperature, may be 2% to 4% lower. 2.2.4 DegradedPerformance When a proponent conducts a detailed economic evaluation of a power plant, for a 20-year project life, he must ensure that the economic performance (power sales UNDERSTANDING GAS TURBINE PERFORMANCE © Gryphon International Engineering Services Inc. St. Catharines, Ontario, Canada GTPerf_0900 Page 9PDF Image | UNDERSTANDING GAS TURBINE PERFORMANCE
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