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TECHNICAL BRIEFS

An Attempt to Scale the Vibrations of Water Pipes

[+] Author and Article Information
P. Moussou

 LaMSID, UMR CNRS EDF 2832, 1, avenue du Général de Gaulle, 92141 Clamart Cedex, France

J. Pressure Vessel Technol 128(4), 670-676 (Feb 10, 2006) (7 pages) doi:10.1115/1.2349583 History: Received December 19, 2005; Revised February 10, 2006

The goal of the paper is to provide an estimation of the vibrations of a water pipe subjected to standard turbulent excitations. Firstly, a simplified expression of the acoustic pressure generated by a standard valve or orifice is proposed. It is based on the hydraulic pressure drop and a Strouhal number. Secondly, a theoretical analysis of fluid-structure interaction yields a screening expression of the structure velocity power spectral density (PSD), as a function of the acoustic pressure source. Field data are used for validation. It is shown that cavitation-induced vibration can be directly identified by plotting the structure velocity PSD in dimensionless form.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Pressure PSD generated by an orifice

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Figure 2

Dimensionless pressure source for an orifice with a d∕D ratio equal to 0.4

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Figure 3

Dimensionless pressure source for an orifice with a d∕D ratio equal to 0.5

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Figure 4

Dimensionless pressure source for a cavitating orifice with a d∕D ratio equal to 0.4

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Figure 5

Dimensionless pressure source for a cavitating orifice with a d∕D ratio equal to 0.5

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Figure 6

Dimensionless pressure source for a cavitating butterfly valve with an opening of 80%, a flow equal to 594m3∕h and a pressure drop equal to 1.8bar

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Figure 7

Comparison of acoustic and structural velocities of an industrial piping system

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Figure 8

Dimensionless velocity PSD for a pipe subjected to an orifice noise

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Figure 9

Dimensionless velocity PSD for a pipe with a cavitating butterfly valve

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Figure 10

Cosine combination of pressure PSD

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