Damping Analysis of Hydraulic Transients in Pump-Rising Main Systems
Publication: Journal of Hydraulic Engineering
Volume 139, Issue 2
Abstract
This paper focuses on the analysis of unsteady pipe flows caused by a pump trip in a water pipeline system. Field experiments have been carried out to collect transient pressure and steady-state flow rate data in the Prado–Instituto Politécnico da Guarda (IPG) pumping system located in Guarda, Portugal. Observed transient pressures were compared with numerical results. Results obtained were excellent both in terms of damping and phase shift of the transient pressure signal, provided that unsteady friction effects were taken into account and an appropriate downstream end boundary condition was considered. The downstream end boundary condition was described by small tanks with variable level and with free discharge into the storage tank; the variation of water level in these small tanks results in the relief of extreme transient pressures (conversely to what is observed in the line-packing effect) and changes the shape of transient pressure waves. This analysis has shown that classical water hammer theory (neglecting unsteady friction) and the consideration of a constant-level reservoir at the downstream end do not accurately describe the observed transient behavior of pressurized pipe systems.
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Acknowledgments
The authors gratefully acknowledge the financial support of Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) and the Portuguese Foundation for Science and Technology (FCT), which provided a postdoctoral scholarship to the first author. The authors would also to thank Zêzere and Côa Water utility and Dr. Fábio Gonçalves and Nuno Melo for support in the development of field tests.
References
Almeida, A. B., and Koelle, E. (1992). Fluid transients in pipe networks, Computational Mechanics Publications, Elsevier Applied Science, Southampton, UK.
Brunone, B., Golia, U. M., and Greco, M. (1991). “Modelling of fast transients by numerical methods.” Proc., Int. Meeting on Hydraulic Transients and Water Column Separation, E. Cabrera and M. Fanelli, eds., IAHR, Valencia, Spain, 273–280.
Chaudhry, M. H. (1987). Applied hydraulic transients, 2nd Ed., Litton Educational, Van Nostrand Reinhold, New York.
Covas, D. I. C. (2003). “Inverse transient analysis for leak detection and calibration of water pipe systems–modelling special dynamic effects.” Ph.D. thesis, Univ. of London, London.
Covas, D. I. C., and Ramos, H. (2010). “Case studies of leak detection and location in water pipe systems by inverse transient analysis.” J. Water Resour. Plann. Manage., 136(2), 248–257.
Covas, D. I. C., Stoianov, I., Mano, J., Ramos, H., Graham, N., and Maksimovic, C. (2005). “The dynamic effect of pipe-wall viscoelasticity in hydraulic transients. Part II—model development, calibration and verification.” J. Hydraul. Res., 43(1), 56–70.
Di Santo, A. R., Fratino, U., Iacobellis, V., and Piccinni, A. F. (2002). “Effects of free outflow in rising mains with air chamber.” J. Hydraul. Eng., 128(11), 992–1001.
Ramos, H., Almeida, A. B., Borga, A., and Anderson, A. (2005). “Simulation of severe hydraulic transient conditions in hydro and pump systems.” Water Resour., 26(2), 7–16.
Ramos, H., Borga, A., Covas, D. I. C., and Loureiro, D. (2004). “Surge damping analysis in pipe systems: Modelling and experiments.” J. Hydraul. Res., 42(4), 413–425.
Savic, D. A., Kapelan, Z. S., and Jonkergouw, P. M. R. (2009). “Quo vadis water distribution model calibration?” Urban Water J., 6(1), 3–22.
Soares, A. K., Covas, D. I. C., and Reis, L. F. R. (2008). “Analysis of PVC pipe-wall viscoelasticity during water hammer.” J. Hydraul. Eng., 134(9), 1389–1394.
Stephens, M., Lambert, M. F., Simpson, A. R., and Vítkovský, J. P. (2011). “Calibrating the water-hammer response of a field pipe network by using a mechanical damping model.” J. Hydraul. Eng., 137(10), 1225–1237.
Stephens, M., Lambert, M. F., Simpson, A. R., Vítkovský, J. P., and Nixon, J. (2004). “Field tests for leakage, air pocket, and discrete blockage detection using inverse transient analysis in water distribution pipes.” Proc., 6th Water Distribution Systems Analysis Symp., 2004 World Water and Environmental Resources Congress, ASCE, Salt Lake City.
Stephens, M., Simpson, A. R., Lambert, M. F., and Vítkovský, J. P. (2005). “Field measurements of unsteady friction effects in a trunk transmission pipeline.” Proc., 7th Annual Symp. on Water Distribution Systems Analysis, ASCE, Anchorage, AK.
Swamee, P. K. (1993). “Design of a submarine pipeline.” J. Transp. Eng., 119(1), 159–170.
Thorley, A. R. D., and Faithfull, E. M. (1992). “Inertias of pumps and their driving motors.” Proc., Int. Conf. on Unsteady Flow and Fluid Transients, R. Bettess and J. Watts, eds., Balkema, Rotterdam, Netherlands, 285–289.
Vardy, A. E., and Brown, J. M. (2007). “Approximation of turbulent wall shear stresses in highly transient pipe flows.” J. Hydraul. Eng., 133(11), 1219–1228.
Vítkovský, J. P., Lambert, M. F., and Simpson, A. R. (2000). “Advances in unsteady friction modelling in transient pipe flow.” Proc., 8th Int. Conf. on Pressure Surges—Safe Design and Operation of Industrial Pipe Systems, A. Anderson, ed., Publication No. 39, BHR Group, Suffolk, UK, 471–498.
Vítkovský, J. P., Lambert, M. F., Simpson, A. R., and Liggett, J. A. (2007). “Experimental observation and analysis of inverse transients for pipeline leak detection.” J. Water Resour. Plann. Manage., 133(6), 519–530.
Wylie, E. B., and Streeter, V. L. (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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Information
Published In
Journal of Hydraulic Engineering
Volume 139 • Issue 2 • February 2013
Pages: 233 - 243
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Mar 3, 2009
Accepted: Jul 18, 2012
Published online: Jul 21, 2012
Published in print: Feb 1, 2013
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