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Research Papers: Fluid-Structure Interaction

Investigation on Redesigning 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,
Sfax 3038, Tunisia;
Mechanics, Modeling, Energy and
Materials M2EM,
Department of Mechanics,
National Engineering School of Gabès,
University of Gabès,
Zrig, Gabès 6029, Tunisia

Ali Triki

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

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 5, 2017; final manuscript received April 28, 2018; published online February 21, 2019. Assoc. Editor: Tomomichi Nakamura.

J. Pressure Vessel Technol 141(2), 021301 (Feb 21, 2019) (10 pages) Paper No: PVT-17-1103; doi: 10.1115/1.4040136 History: Received June 05, 2017; Revised April 28, 2018

This paper explored and compared the effectiveness of the inline and the branching redesign strategies used to control water-hammer surges initiated into 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 (HDPE or LDPE) 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.

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References

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Figures

Grahic Jump Location
Fig. 1

Comparison of measured and computed downstream pressure-head signals using the (1D) unconventional water-hammer solver based upon the Ramos formulation and the Vitovsky and Kelvin–Voigt formulations

Grahic Jump Location
Fig. 2

Schematic illustration of the hydraulic system for the up-surge control test-case: (a) the nonprotected system, (b) the protected system using the inline, and (c) the protected system using the branching technique

Grahic Jump Location
Fig. 3

Comparison of the downstream pressure heads for the nonprotected hydraulic system along with the inline and branching protected systems employing HDPE or LDPE short-sections

Grahic Jump Location
Fig. 4

Variation of first-cycle pressure-head peaks and period at the downstream valve section depending on the: (a) short-section diameter and (b) short-section length

Grahic Jump Location
Fig. 5

Schematic illustration of the hydraulic system for the down-surge control test-case: (a) the nonprotected system, (b) the protected system using the inline, and (c) the protected system using the branching technique

Grahic Jump Location
Fig. 6

Comparison of the upstream pressure-heads for the nonprotected hydraulic system along with the branching- and inline-protected systems employing HDPE or LDPE short-sections

Grahic Jump Location
Fig. 7

Variation of first-cycle pressure-head crests and period at the upstream valve section, depending on the: (a) short-section diameter and (b) short-section length

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