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.
Evaluation of Leak-Before-Break (LBB) Behavior For Axially Notched X65 and X80 Line Pipes
Contributed by the OOAE Division for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received March 2003; final revision, March 2004. Associate Editor: Chon Tsai.
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Kawaguchi , S., Hagiwara , N., Masuda, T., and Toyoda, M. (March 7, 2005). "Evaluation of Leak-Before-Break (LBB) Behavior For Axially Notched X65 and X80 Line Pipes ." ASME. J. Offshore Mech. Arct. Eng. November 2004; 126(4): 350–357. https://doi.org/10.1115/1.1834619
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