Research Papers: Materials Technology

Effect of Operating Pressure and Dent Depth on Burst Strength of NPS30 Linepipe With Dent–Crack Defect

[+] Author and Article Information
Hossein Ghaednia

Centre for Engineering Research
in Pipelines (CERP),
University of Windsor,
Windsor, ON N9B 3P4, Canada

Sreekanta Das

Associate Professor
Centre for Engineering Research
in Pipelines (CERP),
University of Windsor,
Windsor, ON N9B 3P4, Canada

Rick Wang, Richard Kania

TransCanada Pipelines Limited,
Calgary, AB T2P 5H1, Canada

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 18, 2014; final manuscript received February 10, 2015; published online March 16, 2015. Assoc. Editor: Xin Sun.

J. Offshore Mech. Arct. Eng 137(3), 031402 (Jun 01, 2015) (8 pages) Paper No: OMAE-14-1045; doi: 10.1115/1.4029895 History: Received April 18, 2014; Revised February 10, 2015; Online March 16, 2015

Buried linepipe can be exposed to various external interferences and corrosive environment and as a result, damage in the form of dent or corrosion or crack or gouge or combination of any of these damages can form in the pipe wall. A defect combining dent and crack, often known as dent–crack defect, which may lead to a rupture or leak in the pipe wall and hence, the pipeline operator becomes concerned about the performance and safety of the pipeline. A research was recently completed at the Centre for Engineering Research in Pipelines (CERP), University of Windsor to study the influence of dent depth and operating line pressure on the pressure capacity (burst strength) of 30 in. diameter and X70 grade linepipe. This study found that the dent depth of 12% with crack depth of 4 mm or more can reduce the pressure capacity by 38%. This paper discusses the test specimens, test setup, test procedure, test results, and data obtained from finite element analyses.

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Fig. 1

Rectangular indenter used to create dent

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Fig. 2

EDM cut V-notch on pipe wall. (a) Pipe wall section showing V-notch and crack and (b) sample's location on the V-notch.

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Fig. 3

Picture taken after fatigue and burst test by SEM at different locations of the V-notch. (a) V-notch, fatigue crack, and ductile fracture area under SEM in sample's location 3 and (b) sample's location 4 under SEM.

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Fig. 4

Schematic and photo of fatigue load test setup. (a) Schematic and (b) real test setup.

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Fig. 5

Schematic and photo of denting test setup. (a) Schematic and (b) real test setup.

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Fig. 7

Load–deformation behaviors. (a) Specimens SP2, SP3, and SP4 and (b) specimens SP3 and SP5.

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Fig. 8

Burst pressure of test specimens

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Fig. 9

Fracture area after burst test on pipe specimens. (a) Fracture area in SP1-P00-D0, (b) fracture area in SP3-P00-D4, (c) fracture area in SP4-P00-D6, and (d) fracture area in SP5-P30-D4.

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Fig. 10

Meshed pipe and notch area. (a) Pipe, (b) crack, (c) end support, and (d) indenter.

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Fig. 11

Stress–strain relationship for pipe material

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Fig. 12

The load–deformation of tests and FEA models. (a) Comparison of SP3-P00-D4 and FEA model and (b) Comparison of SP5-P30-D4 and FEA model.

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Fig. 13

The longitudinal strain of the tests and FEA models. (a) Comparison of SP3-P00-D4 and FEA model and (b) comparison of SP5-P30-D4 and FEA model.

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Fig. 14

Effect of dent depth and internal pressure on burst pressure of pipe specimens




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