Evaluation of Leak-Before-Break (LBB) Behavior For Axially Notched X65 and X80 Line Pipes
Author:
Kawaguchi Shinobu1, Hagiwara Naoto1, Masuda Tomoki1, Toyoda Masao2
Affiliation:
1. Pipeline Technology Center, Tokyo Gas Co., Ltd., 1-7-7, Suehiro-cho, Tsurumi-ku, Yokohama, Japan 2. Dept. of Manufacturing Science, Osaka Univ. 2-1, Yamada-oka, Suita, Osaka, Japan
Abstract
Leak-before-break (LBB) behavior was evaluated for two series of API 5L X65 line pipes and three series of X80 line pipes with various levels of Charpy V-notch (CVN) absorbed energy. Full-scale hydrostatic burst tests were conducted for the line pipes with an axial through-wall (TW) notch to determine LBB criteria, that is, the relationship between the axial TW notch length and hoop stress for LBB. The determined LBB criteria were verified by full-scale partial gas burst tests for line pipes with an axial part-through-wall (PTW) notch and were then compared to the estimation using the CVN energy-based equation that Kiefner et al. have proposed. The present study demonstrated that the estimation using the CVN-based equation was in good agreement with the experimental results for the pipes with a relatively low CVN energy of less than 130 J. On the contrary, the equation was not applicable to the pipes with a relatively high CVN energy of more than 130 J. The results of instrumented Charpy tests clarified that the load versus load-point displacement curves for Charpy specimens from the high CVN energy pipes were different from those from the low CVN energy pipes. Therefore, the applicability of the CVN-based equation was dependent on the load versus load-point displacement curve for a Charpy specimen.
Publisher
ASME International
Subject
Mechanical Engineering,Ocean Engineering
Reference16 articles.
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