Online Monitoring of Steel-Lined Pressure Shafts by Using Pressure Transient Signals under Normal Operation Conditions

AbstractThe 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 roc...

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Bibliographic Details
Published inJournal of hydraulic engineering (New York, N.Y.) Vol. 138; no. 12; pp. 1110 - 1118
Main Authors Hachem, F. E, Schleiss, A. J
Format Journal Article
LanguageEnglish
Published Reston, VA American Society of Civil Engineers 01.12.2012
Subjects
Applied sciences
Attenuation coefficients
Deterioration
Dynamical systems
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Hydroelectric power plants
Installations for energy generation and conversion: thermal and electrical energy
Monitoring
Pressure shafts
Rock
Technical Papers
Water hammer
Wave attenuation
Switzerland
Europe
Hydroelectric power plant
Wave attenuation
Mechanical properties
Shielding
Fluid structure interaction
Steel
Experimental study
Pressure sensor
Statistics
Shafts
Statistical quality control
Water hammer
Quality control
Rocks
Concrete
Stiffness
Steel-lined pressure shafts and tunnels
Wave celerity
Monitoring
Crack
Tunnels
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Summary:AbstractThe 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.
Bibliography:ObjectType-Article-1
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ISSN:0733-9429
1943-7900
DOI:10.1061/(ASCE)HY.1943-7900.0000636