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Research Papers: Design and Analysis

Effects of the Initial Geometric Imperfections on the Buckling Behavior of High-Strength UOE Manufactured Steel Pipes

[+] Author and Article Information
Muntaseer Kainat

4-110 Markin/CNRL Natural Resources
Engineering Facility,
University of Alberta,
9105 116th Street,
Edmonton, AB T6G 2W2, Canada
e-mail: kainat@ualberta.ca

Meng Lin

Markin/CNRL Natural Resources
Engineering Facility,
University of Alberta,
9105 116th Street,
Edmonton, AB T6G 2W2, Canada
e-mail: lin4@ualberta.ca

J. J. Roger Cheng

3-029 Markin/CNRL Natural Resources
Engineering Facility,
University of Alberta,
9105 116th Street,
Edmonton, AB T6G 2W2, Canada
e-mail: roger.cheng@ualberta.ca

Michael Martens

TRansCanada PipeLines Ltd.,
301 450-1st Street SW,
Calgary, AB T2P 5H1, Canada
e-mail: michael_martens@transcanada.com

Samer Adeeb

3-025 Markin/CNRL Natural Resources
Engineering Facility,
University of Alberta,
9105 116th Street,
Edmonton, AB T6G 2W2, Canada
e-mail: adeeb@ualberta.ca

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 26, 2015; final manuscript received March 3, 2016; published online April 29, 2016. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 138(5), 051206 (Apr 29, 2016) (15 pages) Paper No: PVT-15-1233; doi: 10.1115/1.4032990 History: Received October 26, 2015; Revised March 03, 2016

The effects of the initial geometric imperfections on the buckling response of grade X-100 UOE manufactured pipes are studied through finite element analysis (FEA). The initial geometric imperfections had been previously measured and quantified in terms of deviations in outside radius (OR) and wall thickness. The measurement results are used to develop imperfection models to be incorporated into buckling analysis. The OR deviation is seen to have insignificant effects on the buckling behavior, while the effects of thickness deviation are seen to be profound for both unpressurized and pressurized pipes. The geometric imperfection models are further investigated through a sensitivity study to isolate the most influential imperfection aspects on the buckling resistance of UOE pipes. A parametric study is carried out using these models and shows that excluding geometric imperfections will always result in overprediction of buckling capacity irrespective of D/t ratios.

Copyright © 2016 by ASME
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References

Kainat, M. , 2014, “ Initial Imperfections of High Strength UOE Manufactured Steel Pipes and Their Effects on Pipe Buckling,” Ph.D. thesis, University of Alberta, Edmonton, AB, Canada.
Kainat, M. , Adeeb, S. , Cheng, J. J. R. , Ferguson, J. , and Martens, M. , 2012, “ Measurement of Initial Imperfection of Energy Pipelines Using 3D Laser Scanner,” 3rd International Structural Specialty Conference, CSCE, Edmonton, AB, Canada.
Kainat, M. , Adeeb, S. , Cheng, J. J. R. , Ferguson, J. , and Martens, M. , 2012, “ Identifying Initial Imperfection Patterns of Energy Pipes Using a 3D Laser Scanner,” ASME Paper No. IPC2012-90201.
Kainat, M. , Cheng, J. J. R. , Martens, M. , and Adeeb, S. , 2015, “ Measurement and Characterization of the Initial Geometric Imperfections in High Strength UOE Manufactured Steel Pipes,” ASME J. Pressure Vessel Technol., 138(2), p. 021201. [CrossRef]
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Figures

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Fig. 1

(a) OR deviation pattern of NPS 42 B pipe and (b) ellipse/ovalization approximation of OR deviation

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Fig. 2

(a) Wall thickness deviation pattern of NPS 34 B against the angles around perimeter and (b) schematic representation of thickness deviation pattern

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Fig. 3

(a) OR deviation model 1 and (b) OR deviation model 2

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Fig. 4

(a) Thickness deviation model fitted to the measured deviation through regression analysis and (b) thickness deviation model manually fitted to the measured deviation

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Fig. 5

(a) Cylindrical coordinate system adopted for assigning the thickness deviation model and (b) shell thickness deviation spectrum and its orientation

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Fig. 6

Sign conventions for the applied end rotation

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Fig. 11

(a) M-R response of an NPS 42 in. ideal pipe with 14.275 mm wall thickness and (b) deformed mesh of the pipe models with and without internal pressure

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Fig. 12

M-R responses of (a) unpressurized pipe with OR deviation model 1, (b) pressurized pipe with OR deviation model 1, (c) unpressurized pipe with OR deviation model 2, and (d) pressurized pipe with OR deviation model 2

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Fig. 13

(a) M-R responses of unpressurized pipe with thickness deviation and (b) M-R responses of pressurized pipe with thickness

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Fig. 14

For three combinations of Dmax and Dmin: (a) variations of peak moments of unpressurized pipe, (b) variations of peak moments of pressurized pipe, (c) variations of CER of unpressurized pipe, and (d) variations of CER of pressurized pipe

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Fig. 15

(a) Buckling response of unpressurized pipe with varying locations of maximum wall thickness, (b) buckling responses of pressurized pipes with varying locations of maximum wall thickness, (c) variations in peak moment with changes in the location of maximum thickness, and (d) variations in CER with changes in the location of maximum thickness

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Fig. 16

(a) Variations in peak moment with θneg dev from 120 to 200 deg, (b) variations in CER with θneg dev from 120 to 200 deg, (c) buckling responses of unpressurized pipes with the original and the symmetric thickness deviation models, and (d) buckling responses of pressurized pipes with the original and the symmetric thickness deviation models

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Fig. 17

(a) Buckling responses of unpressurized pipes with the maximum thickness deviation decreasing from 30% to 15% and (b) buckling responses of pressurized pipes with the maximum thickness deviation decreasing from 30% to 15%

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Fig. 18

(a) Buckling responses of unpressurized pipes with longitudinal variations and (b) buckling responses of pressurized pipes with longitudinal variations

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Fig. 19

(a) Changes in peak moments of unpressurized and pressurized pipes with increasing thickness deviation amplitudes and (b) changes in CER of unpressurized and pressurized pipes with increasing thickness deviation amplitudes

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