Verifying Computations for Advanced Problems in Power Piping with in Situ Measurement
The paper presents two cases in which in situ measurement in a power plant helped to produce reliable computational estimates for advanced problems in power piping systems. In both cases — a transient and a steady-state vibration problem — the objective was to identify the effects of flow-induced piping vibration with minimal expenditure of time and money. Both cases belong into the category of unanticipated vibration problems, which could cause piping failure.
In the first case transient effects of loss of power to operating pumps in a service water piping have been investigated computationally. The measurement was used to prove the suitability of the model used for hydraulic and structural analysis. The paper describes the models used and compares measured time histories with computational estimates.
In the second case during preoperational testing a steady-state vibration problem has been analysed by combining test and computation. A comprehensive numerical treatment of the phenomenon in this case would have been prohibitively expensive, if possible at all. The paper describes the procedure followed and compares measured values with computational estimates.
The paper highlights how relatively simple measurements can provide important information for experimental verification of sophisticated computations in the engineering praxis.
KeywordsMode Shape Response Spectrum Cooling Water System Computational Estimate Modal Superposition
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