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Research Papers: Codes and Standards

Assessment of Piping Field Failures and Burst Tests on Carbon Steel Pipes With Local Wall Thinning Using ASME Section XI Code Case N-597-2

[+] Author and Article Information
Kunio Hasegawa

 Japan Nuclear Energy Safety Organization (JNES), Toranomon 3-17-1, Minatoku, Tokyo 105-0001, Japanhasegawa-kunio@jnes.go.jp

Toshiyuki Meshii

Nuclear Power and Energy Safety Engineering Course, University of Fukui, Bunkyo 3-9-1, Fukui 910-8507, Japanmeshii@u-fukui.ac.jp

Douglas A. Scarth

 Kinectrics, Inc., 800 Kipling Avenue, Toronto, ON, M8Z 6C4, Canadadoug.scarth@kinectrics.com

J. Pressure Vessel Technol 133(3), 031101 (Apr 04, 2011) (10 pages) doi:10.1115/1.4002498 History: Received April 05, 2010; Revised July 14, 2010; Published April 04, 2011; Online April 04, 2011

One of the more common modes of degradation in power plant piping has been wall thinning due to erosion-corrosion or flow-accelerated corrosion. Extensive work has been performed to understand flow-accelerated corrosion mechanisms and develop fracture criteria of locally thinned pipes since the tragic events at Surry Unit 2 and Mihama Unit 3. A large number of tests have been performed on carbon steel pipes, elbows, and tees with local wall thinning. In addition, the American Society of Mechanical Engineers Boiler and Pressure Vessel Code provides procedures in Code Case N-597-2 for the evaluation of wall thinning in pipes. This paper provides validation of the evaluation procedures in Code Case N-597-2 by comparing with the field rupture data and pipe burst test data. The allowable wall thinning from the Code Case N-597-2 procedures is shown to maintain adequate margins against rupture.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 3

Pipe specimens with wall thinning performed by University of Fukui

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Figure 4

Wall thinning geometries for CS and F series pipe specimens

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Figure 1

Illustration of local wall thinning

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Figure 2

Flowchart of an evaluation of local wall thinning in accordance with Code Case N-597-2

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Figure 5

Margin of allowable wall thinning given by the Code Case N-597-2, based on pipe rupture data

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