Online Monitoring of Steel-Lined Pressure Shafts by Using Pressure Transient Signals under Normal Operation Conditions
Publication: Journal of Hydraulic Engineering
Volume 138, Issue 12
Abstract
The local deterioration of the mechanical properties of steel-lined pressure shafts and tunnels induces a decrease of the celerity and an increase of the energy attenuation of water hammer waves. This deterioration may arise from the weakening of the backfill concrete and the surrounding rock mass, which provide the radial support of the steel liner. A new online monitoring system implemented and tested at the Grimsel II pumped-storage shaft in Switzerland is presented. The difficulties encountered during the in situ measurements are outlined. The new monitoring approach is based on acquiring and analyzing the dynamic pressure data generated by the normal operation of pumps and turbines. The wave celerity and the exponential attenuation coefficient of water hammer waves are estimated based on pressure records. Monitoring charts for these indicators are established using the statistical quality control method. The results show a stable monitoring scheme that needs longer acquisition data series to consolidate its control limits.
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Acknowledgments
The study presented here is part of the research project HydroNet (modern methodologies for the design, manufacture, and operation of pumped-storage plants) funded by the Swiss Competence Center for Energy and Mobility (CCEM-CH), Swisselectric research, and the Swiss Office for Energy. The authors wish to acknowledge the technical support of Kraftwerke Oberhasli AG (KWO).
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 138 • Issue 12 • December 2012
Pages: 1110 - 1118
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Sep 26, 2011
Accepted: May 21, 2012
Published online: May 23, 2012
Published in print: Dec 1, 2012
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