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Ca1istrat,M.M.,""Meta1 .iaphragm Coup1ingPerformance, '' Proceedings ofthe 5th TurbomachinerySymposium,Texas A&M.niversity,pp. 117.123, October 1976.
Campbe11,A.J.,""Optica1 A1ignment ofTurbomachinery, '' Proceedings of the2nd TurbomachinerySymposium,Texas A&M.niv.,pp. 8.12,1973.
.odd,R.N.,""Tota1 A1ignment Can Reduce Maintenance and Increase Re1i-abi1ity,''Proceedings of the 9th TurbomachinerySymposium, Texas A&M.niversity,pp. 123.126,1980.
.ssinger,J.N.,""Benchmark Gauges for Hot A1ignment ofTurbomachinery, ''Proceedings of the 9th TurbomachinerySymposium,Texas A&M.niversity,pp. 127.133,1980.
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Control Systems and Instrumentation
Gas turbines operate over a large range of power and in many applica-tions primarily as the driver for generators in a power complex or the driverfor large compressors and pumps in petrochemical complexes, and off-shore platforms. The power and the process requirements control the operations of the plant. In the case of power plants they are usually part of a major gridand they supply the needs to meet the demand ofthegrid, both in power and frequency. Control systems are also closely tied up with the Distributed Control Systems (D-CS) and Condition Monitoring Systems (C-MS) with plant optimization software.
The traditional concept of maintenance in the petrochemical and the utilities industry has been undergoing a major change to ensure that equip-ment not only has the best availability but also is operating at its maximum efficiency. There is a consistent trend in these industries throughout the world to improve maintenance strategy from fix-as-fail to total performancebased planned maintenance. Inpractice, this calls for on-line monitoring and condition management of all major equipment in the plant. To reach the Utopian goal of just-in-time maintenance with minor disruption in the operation of the plant requires a very close understanding of the thermo-dynamic and mechanical aspects of plant equipment to be able to implement predictive maintenance programs.
The benefits of total performance-based planned maintenance not only ensure the best and lowest cost maintenance program but also that the plant is operated at its most efficient point. An important supplementary effect is that the plant will be operating consistently within its environmental constraints.
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