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Local Buckling Behavior of 48″, X80 High-Strain Line Pipes

[+] Author Affiliations
Nobuhisa Suzuki, Hisakazu Tajika

JFE Steel Corporation, Kawasaki, Japan

Satoshi Igi

JFE Steel Corporation, Chiba, Japan

Mitsuru Okatsu

JFE Steel Corporation, Kurashiki, Japan

Joe Kondo

JFE Steel Corporation, Fukuyama, Japan

Takekazu Arakawa

JFE Steel Corporation, Tokyo, Japan

Paper No. IPC2010-31637, pp. 347-354; 8 pages
  • 2010 8th International Pipeline Conference
  • 2010 8th International Pipeline Conference, Volume 4
  • Calgary, Alberta, Canada, September 27–October 1, 2010
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4423-6 | eISBN: 978-0-7918-3885-3
  • Copyright © 2010 by ASME


Two bending tests of X80-grade, 48″ high-strain line pipes pressurized to 60% SMYS were conducted to investigate local buckling behavior. The thickness and D/t ratio of the line pipes were 22.0 mm and 55.4, respectively. The mean Y/T ratio of the high-strain pipes was 0.82. A full-scale bending test apparatus was constructed to conduct the bending tests. The bending test results clarified that the pipes have the 2D average critical compressive strain of 1.51 and 1.67%, which satisfy the strain demand of 1.35%. Validation of FEA is conducted taking into account geometric properties of the pipes in terms of outside diameter and thickness and longitudinal flatness. The FEA results coincide with the test results with respect to peak load, critical displacement, critical rotation and critical compressive strain. The FEA results about the load and displacement relationship also show good agreement with the test results during post-buckling deformation. One developed wrinkle and some small wrinkles were observed on the pipe surface during post-buckling deformation, whose cross sections were fairly captured considering the geometric properties.

Copyright © 2010 by ASME
Topics: Pipes , Buckling



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