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• W2488543067 abstract "Summary: The overall internal condition of a steam turbine can be evaluated using the Valves- Wide-Open test. If steam temperatures and pressures along the turbine steam expansion path are measured, an assessment is possible of the condition of blading sections between available measuring points. The information available from such tests requires high accuracy in taking the performance data, meaning special tests that are expensive. Permanent plant controls and instrumentation systems have not been sufficiently refined to show the often relatively small changes that nevertheless indicate significant changes in steam path condition. This paper shows a case study that shows comparable results between high accuracy tests and the DCS on the unit. Many of the same techniques can be used in troubleshooting when a problem is suspected or evident from normal operational indications. Given the importance of these machines and the condition monitoring possibilities, relatively little has been published over the years on this topic, although some must have been shared within industry associations and conferences. The major text covering this topic is Cotton (1993). Sanders (2002) provides guidance on steam path audits: the evaluation and justification of restoration once a machine is opened, while Lo and Abdullah (2001) describe modelling. This paper describes an application of one of the many types of thermal performance analysis method (Beebe, 1994). The principles described could well be adapted to other kinds of machine. The information should be useful to turbine owners in general when interpreting results from condition monitoring tests. In the case described here, sections of the desuperheater (temperature control device in the boiler steam piping) disintegrated, with metal pieces passing to the turbine. Fortuitously, this unit's first major outage for inspection, maintenance and modification works in its 9 years of operation had been scheduled for soon after the changes were apparent. The effects on measured parameters are shown before and after the outage. Useful consistency was obtained between the results from accurate tests and that from the plant's instrumentation system, suggesting that where systems allow, that regular tests using permanent systems should be conducted. Specialist services in testing, monitoring, cycle modelling and performance analysis are available from at least one turbine manufacturer (Albert, 2000)." @default.
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• W2488543067 date "2005-01-01" @default.
• W2488543067 modified "2023-09-26" @default.
• W2488543067 title "Steam turbine performance condition monitoring using plant instrumentation: case study" @default.
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