Extended Blockage Detection in Pipes Using the System Frequency Response: Analytical Analysis and Experimental Verification
Publication: Journal of Hydraulic Engineering
Volume 139, Issue 7
Abstract
Extended blockages in a pipeline system are expected to impose changes onto the system resonant frequencies where the size and nature of the frequency shifts can be used to determine the blockage characteristics. Although a theoretical method for detecting and locating extended blockages in pipeline systems using these changes in the system frequency response (SFR) was developed by the authors in a previous paper, the impact of an extended blockage on SFR has yet been verified experimentally and is the topic of this paper. The impact of six different extended blockages under a range of different Reynolds numbers on the frequency response is used to confirm the theoretical behavior of an extended blockage. These experimental tests are conducted in the pipeline hydraulic laboratory at the University of Canterbury, New Zealand. An analytical simplification of the original SFR-based method is used to identify the key blockage parameters governing the frequency shifts and shows that the magnitude of the frequency shift increases with severity of blockages and is related to the changes in characteristic impedance and wave propagation coefficient of pipeline (pipe diameter, thickness, and/or wavespeed) imposed by the blockage. The experiments show that the length and location of potential extended blockages in the pipeline can be accurately predicted by the proposed method. Significant error exists, however, in the prediction of the pipe constriction diameter and is a result of the nonlinear operations in the experiments such as full valve closure in this study and the inability of existing models for perfectly replicating transient events in pipes with severe constrictions.
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Acknowledgments
This research is supported by the Research Grant Council (RGC) of Hong Kong under project numbers 612511 and 612910 and by the Marsden Grant project UOC-1103 from the Royal Society of New Zealand.
References
Brunone, B., Ferrante, M., and Meniconi, S. (2008). “Discussion of ‘detection of partial blockage in single pipelines’ by P. K. Mohapatra, M. H. Chaudhry, A. A. Kassem, and J. Moloo.” J. Hydraul. Eng., 134(6), 872–874.
Chaudhry, M. H. (1987). Applied hydraulic transients, 2nd Ed., Van Nostrand Reinhold, New York.
Duan, H. F., Lee, P. J., Ghidaoui, M. S., and Tung, Y. K. (2011a). “Leak detection in complex series pipelines by using system frequency response method.” J. Hydraul. Res., 49(2), 213–221.
Duan, H. F., Lee, P. J., Ghidaoui, M. S., and Tung, Y. K. (2012). “Extended blockage detection in pipelines by using the system frequency response analysis.” J. Water Resour. Plann. Manage., 138(1), 55–62.
Duan, H. F., Lu, J. L., Kolyshkin, A. A., and Ghidaoui, M. S. (2011b). “The effect of random inhomogeneities on wave propagation in pipes.” Proc. of the 34th IAHR Congress, Causal Productions Pty Ltd, South Australia.
Ferrante, M., and Brunone, B. (2003). “Pipe system diagnosis and leak detection by unsteady-state tests-1: Harmonic analysis.” Adv. Water Resour., 26(1), 95–105.
Hachem, F., and Schleiss, A. (2012). “Effect of drop in pipe wall stiffness on water-hammer speed and attenuation.” J. Hydraul. Res., 50(2), 218–227.
Kim, Y. I. (2008). “Advanced numerical and experimental transient modelling of water and gas pipeline flows incorporating distributed and local effects.” Ph.D. thesis, Univ. of Adelaide, Adelaide, South Australia.
Lee, P. J., Lambert, M. F., Simpson, A. R., Vítkovský, J. P., and Liggett J. (2006). “Experimental verification of the frequency response method for pipeline leak detection.” J. Hydraul. Res., 44(5), 693–707.
Lee, P. J., and Vítkovský, J. P. (2010). “Quantifying linearization error when modeling fluid pipeline transients using the frequency response method.” J. Hydraul. Eng., 136(10), 831–836.
Lee, P. J., Vítkovský, J. P., Lambert, M. F., Simpson, A. R., and Liggett J. (2004). “Experimental validation of frequency response coding for the location of leaks in single pipeline systems.” Proc., Practical Application of Surge Analysis for Design and Operation, 9th Int. Conf. on Pressure Surges, BHR Group, Bedford, UK, 239–253.
Lee, P. J., Vítkovský, J. P., Lambert, M. F., Simpson, A. R., and Liggett, J. (2008). “Discrete blockage detection in pipelines using the frequency response diagram: numerical study.” J. Hydraul. Eng., 134(5), 658–663.
Meniconi, S., Brunone, B., and Ferrante, M. (2011). “In-line pipe device checking by short period analysis of transient tests.” J. Hydraul. Eng., 137(7), 713–722.
Mohapatra, P. K., Chaudhry, M. H., Kassem, A. A., and Moloo, J. (2006). “Detection of partial blockage in single pipelines.” J. Hydraul. Eng., 132(2), 200–206.
Sattar, A. M., and Chaudhry, M. H. (2008). “Leak detection in pipelines by frequency response method.” J. Hydraul. Res., 46(E1), 138–151.
Sattar, A. M., Chaudhry, M. H., and Kassem, A. A. (2008). “Partial blockage detection in pipelines by frequency response method.” J. Hydraul. Eng., 134(1), 76–89.
Stephens, M. L. (2008). “Transient response analysis for fault detection and pipeline wall condition assessment in field water transmission and distribution pipelines and networks.” Ph.D. thesis, Univ. of Adelaide, Adelaide, South Australia.
Vardy, A. E., and Brown, J. M. B. (1996). “On turbulent, unsteady, smooth-pipe friction.” Proc., 7th Int. Conf. on Pressure Surges and Fluid Transients in Pipelines and Open Channels, BHR Group, Bedford, UK, 289–311.
Vítkovský, J. P., Lambert, M. F., Simpson, A. R., and Bergant A. (2003). “Frequency-domain transient pipe flow solution including unsteady friction.” Proc., Int. Conf. on Pumps, Electromechanical Devices and Systems Applied to Urban Water Management, Vol. 2, E. Cabrera and E. Cabrera Jr., eds., Swets and Zietlinger Publishers, Netherlands, 773–780.
Wang, X. J., Lambert, M. F., and Simpson, A. R. (2005). “Detection and location of a partial blockage in a pipeline using damping of fluid transients.” J. Water Resour. Plann. Manage., 131(3), 244–249.
Washio, S., Takahashi, S., Yu, Y., and Yamaguchi, S. (1996). “Study of unsteady orifice flow characteristics in hydraulic oil lines.” J. Fluids Eng., 118(4), 743–748.
Wylie, E. B., Streeter, V. L., and Suo, L. S. (1993). Fluid transients in systems, Prentice-Hall, Englewood Cliffs, NJ.
Zielke, W. (1968). “Frequency-dependent friction in transient pipe flow.” J. Basic Eng., 90(1), 109–115.
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© 2013 American Society of Civil Engineers.
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Received: May 16, 2012
Accepted: Jan 22, 2013
Published online: Jan 24, 2013
Published in print: Jul 1, 2013
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