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Research Papers: Pipeline Systems

A Simple Measurement Method of Pressure Pulsations Using Outer Surface Strain 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

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

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 January 25, 2015; final manuscript received February 6, 2016; published online March 11, 2016. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 138(3), 031702 (Mar 11, 2016) (10 pages) Paper No: PVT-15-1012; doi: 10.1115/1.4032785 History: Received January 25, 2015; Revised February 06, 2016

This study proposes a method to measure pressure pulsations in piping systems easily and directly for their accurate evaluation of occurrence location and pressure amplitude. In the proposed method, the pulsations were estimated by combining the strain measurement result on the pipe outer surface with the calculated formula result for thick-walled cylinders. The proposed method was validated experimentally using a mock-up piping system. It was demonstrated that the method could measure the amplitudes and behavior of pressure pulsations with a practical accuracy. The factors influencing the measurement accuracy of the method were also discussed. The method is expected to contribute to more efficient plant maintenance to prevent fatigue failure of piping and plant components because the pulsations that the method measures are the main cause of vibration fatigue and acoustic noise in piping systems.

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References

Figures

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Fig. 4

Waterfall analysis results for pump pulsations in the sweep tests. (a) Internal pressure, 1 MPa; position of pressure measurement, P5. (b) Internal pressure, 3 MPa; position of pressure measurement, P5.

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Fig. 5

Peak-hold analysis results for pump pulsations in the sweep tests. (a) Internal pressure, 1 MPa; position of pressure measurement, P5. (b) Internal pressure, 3 MPa; position of pressure measurement, P5.

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Fig. 3

Locations for pressure and strain measurements

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Fig. 2

Schematic view of the mock-up piping system [25]

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Fig. 1

Photograph of the mock-up piping system

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Fig. 6

Time histories of pressure pulsations measured at the P5 position, strain measured at the S2 position, and pressure pulsations calculated from the strain at 3 MPa and pump rotation speed: (a) 150 rpm, (b) 342 rpm, and (c) 450 rpm

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Fig. 7

Frequency analysis results of pressure pulsations measured at the P5 position and strain measured at the S2 position at 3 MPa and pump rotation speed: (a) 150 rpm, (b) 342 rpm, and (c) 450 rpm

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Fig. 8

Pressure pulsation modes at 3 MPa and pump rotation speed: (a) 150 rpm, (b) 342 rpm, and (c) 450 rpm

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Fig. 9

Comparison of pressure measured by the pressure gauge and pressure measured by the strain gauge when using the thin-walled cylinder formula

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Fig. 10

Comparison of pressure measured using the pressure gauge and pressure measured by the strain gauge when using the thick-walled cylinder formula

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Fig. 11

Waterfall analysis results for strain response at the S1 position at internal pressure of 3 MPa in the sweep tests for (a) the mock-up not reinforced and (b) the mock-up reinforced

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Fig. 12

Time histories of pressure pulsations measured at the P4 position, strain measured at the S1 position, and pressure pulsations calculated from the strain at 3 MPa and 450 rpm

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