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Permanent link (DOI): https://doi.org/10.7939/R3599Z78H

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INITIAL IMPERFECTIONS OF HIGH STRENGTH UOE MANUFACTURED STEEL PIPES AND THEIR EFFECTS ON PIPE BUCKLING Open Access

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Other title
Subject/Keyword
High Strength Steel
UOE
3D Metrology
Pipe Buckling
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Kainat, Muntaseer S
Supervisor and department
Adeeb, Samer (Civil and Environmental Engineering)
Examining committee member and department
Cheng, J. J. Roger (Civil and Environmental Engineering)
Mohareb, Magdi (Civil Engineering, University of Ottawa)
Mohammed, Yasser (Civil and Environmental Engineering)
El-Rich, Marwan (Civil and Environmental Engineering)
Duke, Kajsa (Mechanical Engineering)
Chen, Weixing (Chemical and Materials Engineering)
Department
Department of Civil and Environmental Engineering
Specialization
STRUCTURAL ENGINEERING
Date accepted
2014-08-11T09:48:35Z
Graduation date
2014-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
The use of high strength steel pipes in the pipeline industry is increasing due to its cost reduction benefits. The development of high steel grades has enabled the manufacturing of line pipes with large diameter to thickness ratios. The high strength large diameter pipes are commonly manufactured by the UOE forming process, during which, thin steel plates are deformed using mechanical presses and expansion. The plastic deformation of pipe material induced during the UOE forming process is likely to result in initial geometric imperfections in the manufactured pipes. This research introduces a new imperfection measurement technique that employs a high resolution surface profiler for geometric data acquisition, and a reverse engineering software for the geometric analysis of line pipes. The measurements reveal that the geometric imperfections in UOE pipes follow certain patterns in terms of outside radii and pipe wall thickness deviations with respect to the location of the longitudinal seam weld. The outside radii are less than the nominal value at locations opposite to the longitudinal seam weld in a pipe cross section. The pipe wall thickness values are lower at locations near the longitudinal seam weld compared to the thickness at locations opposite to the longitudinal seam weld. These patterns can be expressed in a cylindrical coordinate system with respect to the longitudinal seam weld's location. The sources of the observed patterns can be traced back to the UOE manufacturing process itself. A finite element analysis further confirms that the thickness deviation imperfection observed in the scanned pipes has significant effects on the buckling capacity of line pipes. Critical buckling capacity was reduced up to 27% in unpressurized pipes modelled with the observed thickness deviation compared to the ideal case. This reduction occurred for the case when compressive strain develops in the regions near the location of the longitudinal seam weld. Similarly, for pressurized pipes, the thickness deviation imperfection observed in the scanned pipes reduced the peak moment compared to the ideal pipe by up to 20%. The dimensional tolerances for wall thickness specified in the ASTM codes may not be reliable in this regard. These tolerances need to be revisited for the cases where the critical strain capacity governs the design of pipeline. A higher quality control for UOE manufacturing process is required. The observed imperfection patterns will aid towards improving the quality control of UOE manufactured pipes.
Language
English
DOI
doi:10.7939/R3599Z78H
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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