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research-article

Investigation on re-designing strategies for water-hammer control in pressurized-piping systems.

[+] Author and Article Information
Mohamed Fersi

Department of Mechanics, National Engineering school of Sfax, University of Sfax, B.P. 1173, 3038 Sfax, Tunisia; Research Unit: Mechanics, Modeling, Energy and Materials M2EM, Department of Mechanics, National Engineering School of Gabès, University of Gabès, Zrig 6029, Gabès, Tunisia
mohamedfersi@yahoo.com

Ali Triki

Research Unit: Mechanics, Modeling, Energy and Materials M2EM, Department of Mechanics, National Engineering School of Gabès, University of Gabès, Zrig 6029, Gabès, Tunisia
ali.triki@enis.rnu.tn

1Corresponding author.

ASME doi:10.1115/1.4040136 History: Received June 05, 2017; Revised April 28, 2018

Abstract

This paper explored and compared the effectiveness of the inline and the branching re-design strategies used to control water-hammer surges initiated into an existing steel piping systems. The piping system is handled, at its transient sensitive regions, by replacing an inline, or adding a branching, short-section made of high- or low-density polyethylene pipe-wall materials. The Ramos model was used to describe the transient flow, along with the Method of Characteristics implemented for numerical computations. The comparison of the numerical solution with experimental data available from the literature and alternative numerical solution evidenced that the proposed model could reproduce satisfactorily the magnitude and the phase shift of pressure head evolution. Further, the robustness of the proposed protection procedures was tested with regard to water-hammer up- and down-surge mechanisms, taken separately. Results demonstrated that both utilized techniques provided a useful tool to soften both water-hammer up- and down-surges. Additionally, the amortization of pressure-head -rise and -drop was sensitive to the short-section material and size. Moreover, the branching strategy illustrated several enhancements to the inline one in terms of period spread-out limitation, while providing acceptable pressure-head damping.

Copyright (c) 2018 by ASME
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