Leak detection, experimental and theoretical comparison of characteristics of transient flow in polyethylene pipelines

Document Type : Research Article

Authors

Department of Water Sciences Engineering, Shahid Chamran University

Abstract

Polyethylene pipes are widely used in pressurized water systems. In the design and interpretation of the ram-trapped signal for diagnostic purposes, viscoelastic behavior of polyethylene tubes should be taken into account. The aim of this study is to detect leakage, and experimental and theoretical comparison of pressure wave velocity and over pressure of transient flow in polyethylene pipes with different Reynolds number. To achieve the objectives of this paper, a physical model was developed in laboratory of the Faculty of Water Sciences Engineering of Shahid Chamran University of Ahwaz and developed two different models of control and a leakage system was and were conducted a number of water-hammer tests. The leakage accuracy in this model increased with increase of Reynolds number. The highest and the lowest percent of the relative error for computational and experimental leakage were estimated 48.8% and 2.02% through a leak hole of 5 mm for experiments with Reynolds numbers of 1283 and 12974, respectively. Also, this inaccurate study shows the relationship between the theory of compressive velocity and overpressure in the polyethylene transfer pipes, so that the compressive velocity obtained from theoretical relationships is less than its actual value, as well as the relative error of the overpressure in leakage experiments Increasing the Reynolds number increases between the amount of the laboratory and the theory.

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References

[1]     Misiunas, D. Vitkovsky´, J. P. Olsson, G. Simpson, A. R. & Lambert, M. F. (2005). Pipeline break detection using pressure transient monitoring. Journal of Water Resources Planning and Management, 131)4(, 316-325.
[2]     Haghighi, a. )1388( Development of pipeline leakage and calibration methods based on reverse transient current modeling. Ph.D. Department of Civil Engineering, Khaje Nasir Din Tusi University of Technology. (in Persian)
[3]     Colombo, A.F. Karney, B.W. 2002. Energy and costs of leaks: toward a comprehensive picture. Journal of Water Resources Planning and Management, ASCE 128 )6(, 441e450.
[4]   Streeter, V. L., and Wylie, E. B. )1978(. Fluid transients,McGraw–Hill International Books, New York.
[5]     Brunone, B., and Ferrante, M. (2001). “Detecting leaks in pressurised pipes by means of transients.” J. Hydraul. Res., 39)5(, 539–547.
[6]  Covas, D. I. C., Stoianov, I., Mano, J., Ramos, H. M., Gra- ham, N., and Maksimovic, C. (2004). “The dynamic effect of pipe-wall viscoelasticity in hydraulic transients. Part I—Experi- mental analysis and creep characterization.” J. Hydraul. Res., 42(5), 517–531.
[7]  Covas, D. I. C., Stoianov, I., Mano, J., Ramos, H. M., Gra- ham, N., and Maksimovic, C. (2005). “The dynamic effect of pipe-wall viscoelasticity in hydraulic transients. Part II—Mod- el development, calibration and verification.” J. Hydraul. Res., 43(1), 56–70.
[8]  Soares, A. K., Covas, D. I. C., and Reis, R. L. F. (2008). “Analysis of PVC pipe-wall viscoelasticity during water ham- mer.” J. Hydraul. Eng.,
10.1061/(ASCE)0733-9429(2008)134:9(1389), 1389–1394.
[9]  Vítkovský, J. P., Lambert, M. F., Simpson, A. R., & Liggett,
J. A. (2007). Experimental observation and analysis of inverse transients for pipeline leak detection. Journal of Water Resources Planning and Management, 133)6(, 519-530.
[10] Al-Khomairi A (2008) Leak detection in long pipelines using the least squares method. J Hydraul Res 46(3):392–401.
[11]  Ferrante, M., Massari, C., Brunone, B., and Meniconi, S. (2011). “Experimental evidence of hysteresis in the head dis-
charge relationship for a leak in a polyethylene pipe.” J. Hydraul. Eng., 10.1061/(ASCE)HY .1943-7900.0000360, 775–780.
[12] Keramat, A., Tijsseling, A. S., Hou, Q., and Ahmadi, A. (2012). “Fluid-structure interaction with pipe-wall viscoelasticity during water hammer.” J. Fluid. Struct., 28, 434–455.
[13] Duan, H., Ghidaoui, M., Lee, P. J., and Tung, Y. (2010). “Unsteady friction and visco-elasticity in pipe fluid transients.” J. Hydraul. Res., 48(3), 354–362.
[14] Lee, P. J., Duan, H. F., Ghidaoui, M., and Karney, B. )2014(. “Frequency domain analysis of pipe fluid transient behavior.” J. Hydraul. Res., 51(6), 609–622.
[15] Taebei, H., Fathi-Moghadam, M. (1393). Hydrolic Flow Measurement in Split Pipelines. Journal of (in Persian) Science and Engineering. Volume 37, number 4, pp. 55-62. Irrigation
[16] Huang, Y. C., Lin, C. C., & Yeh, H. D. (2015). An Opti- mization Approach to Leak Detection in Pipe Networks Using Simulated Annealing. Water Resources Management, 29(11), 4185-4201.
[17] Chaudhry M.H (1987) Applied Hydraulic Transients: sec- ond edition Van Nostrand Reinhold Co., New York.
[18] Wylie E. Benjamin, Streeter Victor L, Suo Lisheng (1993) Fluid Transients in Systems: Prentice Hall.
Amirkabir Journal of Civil Engineering
Volume 51, Issue 3
September and October 2019
Pages 547-556

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