In-Line Pipe Device Checking by Short-Period Analysis of Transient Tests
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 7
Abstract
In this paper, the results of laboratory transient tests concerning the interaction between a pressure wave and an in-line device are discussed. Transients are generated by means of a fast and complete closing of an end valve, and pressure measurements are carried out just upstream of the maneuver valve. The main effect of the device on the pressure time-history—hereafter referred to as pressure signal—is a sharp increase caused by the pressure wave reflection. Three experimental setups are considered, in which different in-line devices are installed (i.e., a ball valve, a butterfly valve, and different-sized orifices). The pressure signal is analyzed in the time domain, and a reliable evaluation of the device location is obtained by means of wavelet functions. Furthermore, on the basis of the value of the pressure increase, the status of the device can be determined; experimental results are synthesized in a dimensionless diagram. Finally, criteria for using the obtained results in other pipe systems are discussed.
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Acknowledgments
We want to thank the associate editor and the three anonymous reviewers not only for the attention they paid to our work but also for the very precious suggestions they gave us. This research has been jointly supported by the Italian Ministry of Education, University, and Research (MIUR) under the Project of Relevant National Interest “Innovative criteria for the sustainable management of water resources in the water distribution systems” and by Fondazione Cassa Risparmio Perugia. The support of A. Cirimbilli in the laboratory activity is highly appreciated.
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Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 7 • July 2011
Pages: 713 - 722
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Feb 13, 2009
Accepted: Jul 29, 2010
Published online: Aug 20, 2010
Published in print: Jul 1, 2011
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