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research-article

Development of Measurement Methods for Vibration-Induced Stress of Small-Bore Piping

[+] Author and Article Information
Akira Maekawa

The Kansai Electric Power Co., Inc. 13-8 Goichi, Mihama-cho, Mikata-gun, Fukui 919-1141, Japan
maekawa.akira@e3.kepco.co.jp

Michiyasu Noda

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

Michiaki Suzuki

Kawasaki Heavy Industries, Ltd. 1-14-5, Kaigan, Minato-ku, Tokyo 105-8315, Japan
suzuki_m@khi.co.jp

Takeshi Suyama

The Kansai Electric Power Co., Inc. 13-8 Goichi, Mihama-cho, Mikata-gun, Fukui 919-1141, Japan
suyama.takeshi@b2.kepco.co.jp

Katsuhisa Fujita

Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
fujita@mech.eng.osaka-cu.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4036512 History: Received May 28, 2016; Revised April 15, 2017

Abstract

The vibration-induced fatigue failure of small-bore piping is one of the common causes of failure trouble at nuclear power plants. Therefore, the purpose of this study is to develop the measurement methods of vibration-induced stress for the screening to prevent from fatigue failure troubles of small-bore piping using portable vibrometers. Firstly, the validity of a measurement method using a single-mass model was conducted, and then a measurement method using a two-mass model developed as an improvement calculation model was conducted. Next, for small-bore piping with typical pattern configurations consisted of several masses and supports, the model considering the supports and the center of gravity being out of pipe centerline was developed and proposed. Finally, for the more complex small-bore piping with general piping configurations consisted of many bends, branches or joints, the method based on the finite element method analysis and using the values measured by a portable vibrometer was developed. In this method, the analytical model was optimized, and the stresses were obtained considering vibration modes as dynamically.

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