Abstract
Gas turbine functional understanding is limited among users in my opinion. I have always viewed the gas turbine as a driver (prime mover) consisting of an air compressor, combustor system, and an expansion turbine. Use the functional knowledge of each of these three components to achieve full functional understanding. Gas turbine classifications are industrial, aeroderivative, and hybrid. Industrial turbines have been known as heavy duty designs but in reality, aeroderivative and hybrid turbines have proven to be as reliable and are gaining acceptance in mechanical drive applications since they can be tested prior to installation and change out times are much lower. Hybrid designs consist of an aeroderivative gas generator (axial compressor, combustor, and high-pressure turbine) and a separate industrial power turbine to drive the load. Be aware that gas turbine technology has advanced rapidly, and unproven designs or extensions of proven designs are much more common than in other types of equipment. Pre-Bid “Cold Eyes” reviews are important to avoid unreliability and to achieve long run lengths. Since gas turbine casing temperatures are high, oil leaks can cause fires. Establish prestart connection check list to assure a restart with zero oil leaks.
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