TS-96 Operating Factors of Gas Turbine Components Total Equivalent Operating Hours (TEOH)(Session D-4 Maintenance and Control 1)
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概要
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The amount of damage accumulated in gas turbine components can be measured by the amount of activities performed by the units in a given environment. In order to reuse the parts after proper refurbishments and extend the lifetime, it is essential to control the amount of accumulated damage under certain levels before the inspections and refurbishments. This control of damage can be accomplished by controlling the accumulated amount of activities of the units which have been represented primarily by operating hours or number of startups. For instance, the hot gas path inspection point is recommended by the original equipment manufacturers (OEM) in terms of the limit of either operating hours or starts as shown in Table 1. The OEMs believe that the recommended inspection interval gives the optimum timing to inspect and refurbish the components for the recycling and lifetime extension. Gas turbines in general run in various duties and modes. Some of these are the base load (>100hrs/start), peaking (<5hrs/start) and cycling (daily 10 to 20 hrs). To those different unit duties, the limit of operating hour method may well represent the amount of operating activities of the base load units, while the limit of number of starts may well represent the amount of operating activities of the peaking units. For the cycling units, which mostly run as frequently as peaking units and as many hours as base load units, the combined effect of operating hours and number of starts should be taken into account. It is vitally important to establish a device to measure the amount of the gas turbine activities accurately and predict the parts degradations safely in widely various cases. This device requires to be comprehensive, consistent and objective. In this paper, a single parameter representation of Total Equivalent Operating Hours (TEOH) is proposed to he used to serve the purposes. In developing TEOH, the theory of interaction between the creep and fatigue damages (linear fraction rule of life) to consider the combined effect of operating hours and number of starts.
- 社団法人日本ガスタービン学会の論文
- 1999-11-14