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Research Papers: Pipeline Systems

Experimental and Numerical Study on Pressure Pulsations Under Various Acoustic Boundary Conditions in Piping Systems

[+] Author and Article Information
Akira Maekawa

Institute of Nuclear Safety System, Inc.,
64 Sata, Mihama-cho,
Mikata-gun, Fukui 919-1205, Japan
e-mails: maekawa@inss.co.jp;
maekawa.akira@e3.kepco.co.jp

Takashi Tsuji

The Kansai Electric Power Co., Inc.,
13-8 Goichi, Mihama-cho,
Mikata-gun, Fukui 919-1141, Japan
e-mail: tsuji.takashi@e4.kepco.co.jp

Michiyasu Noda

The Kansai Electric Power Co., Inc.,
13-8 Goichi, Mihama-cho,
Mikata-gun, Fukui 919-1141, Japan
e-mail: noda.michiyasu@c4.kepco.co.jp

Tsuneo Takahashi

Institute of Nuclear Safety System, Inc.,
64 Sata, Mihama-cho,
Mikata-gun, Fukui 919-1205, Japan
e-mails: takahashi.tsuneo@inss.co.jp;
takahashi_tsuneo@khi.co.jp

Minoru Kato

Kobelco Research Institute, Inc.,
1-5-5 Takatsukadai,
Nishi-ku, Kobe 651-2271, Japan
e-mail: kato.minoru@kki.kobelco.com

Katsuhisa Fujita

Department of Mechanical Engineering,
Osaka City University,
3-3-138 Sugimoto,
Sumiyoshi-ku, Osaka 558-8585, Japan
e-mail: fujita@mech.eng.osaka-cu.ac.jp

1Corresponding author.

2Present address: The Kansai Electric Power Co., Inc., 13-8 Goichi, Mihama-cho, Mikata-gun, Fukui 919-1141, Japan.

3Present address: Kawasaki Heavy Industries, Ltd., 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe 650-8670, Japan.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received May 21, 2016; final manuscript received December 24, 2016; published online February 3, 2017. Assoc. Editor: Reza Adibiasl.

J. Pressure Vessel Technol 139(2), 021703 (Feb 03, 2017) (10 pages) Paper No: PVT-16-1082; doi: 10.1115/1.4035698 History: Received May 21, 2016; Revised December 24, 2016

To improve design and troubleshooting techniques of piping systems for operating power plants, it is necessary to investigate, by experiment and simulation, the behavior of fluid inside the piping system in detail. This study was conducted using full-scale piping system under conditions that could seriously threaten the plant operation, by matching pressure pulsations, acoustic resonance, and piping natural frequency. Although piping vibration is reported to influence fluid pressure pulsations, there were no such examples of influence in this experiment. Knowing that the opening ratio of the pressure control valve affects the boundary condition for acoustic resonance, experiment and simulation at different opening ratios were conducted. It has been suggested that the cases in which a valve partially open at 25% or less should not be taken as a closed end. This finding conflicts with such a widespread design assumption.

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References

Figures

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Fig. 1

Photograph of actual size mock-up piping

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Fig. 2

Outline of actual size mock-up piping

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Fig. 4

FFT analysis results of impact testing at bend B1 in three different directions: (a) the X direction, (b) the Y direction, and (c) the Z direction

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Fig. 5

Peak-hold analysis results of response acceleration in (a) the X direction, (b) the Y direction, and (c) the Z direction in sweep mode of pump rotation speed from 150 rpm to 450 rpm (Pressure, 1.09 MPa; Location, B1)

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Fig. 6

Pressure pulsations behavior in sweep mode test (Pressure, 1.09 MPa; Location, P1): (a) waterfall plots and (b) peak-hold plots

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Fig. 7

Pressure pulsations behavior in sweep mode test (Pressure, 3.08 MPa; Location, P1): (a) waterfall plots and (b) peak-hold plots

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Fig. 8

Experiment and simulation of pressure pulsations in constant rotation speed test (pressure, 1.09 MPa; rotation speed, 150 rpm)

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Fig. 9

Experiment and simulation of pressure pulsations in constant rotation speed test (pressure, 1.50 MPa; rotation speed, 342 rpm)

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Fig. 10

Experiment and simulation of pressure pulsations in constant rotation speed test (pressure, 1.74 MPa; rotation speed, 450 rpm)

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Fig. 11

Experiment and simulation of pressure pulsations in constant rotation speed test (pressure, 3.08 MPa; rotation speed, 150 rpm)

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Fig. 12

Experiment and simulation of pressure pulsations in constant rotation speed test (pressure, 3.37 MPa; rotation speed, 342 rpm)

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Fig. 13

Experiment and simulation of pressure pulsations in constant rotation speed test (pressure, 3.48 MPa; rotation speed, 450 rpm)

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Fig. 14

Comparison of experiment and simulation on acoustic resonance frequency in sweep mode test (rotation speed, 150 rpm; location, P1)

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Fig. 15

Pressure pulsation distribution obtained by numerical simulation (rotation speed, 342 rpm)

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Fig. 16

Relationship between pressure change and valve opening ratio obtained by experiment and simulation (rotation speed, 342 rpm; location, P1)

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