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Research Papers: Pipeline Systems

Finite-Element Evaluation of Burst Pressure Models for Corroded Pipelines

[+] Author and Article Information
Bipul Chandra Mondal

Department of Civil Engineering,
Memorial University of Newfoundland,
St. John's, NL A1B 3X5, Canada
e-mail: bm6080@mun.ca

Ashutosh Sutra Dhar

Assistant Professor
Department of Civil Engineering,
Memorial University of Newfoundland,
St. John's, NL A1B 3X5, Canada
e-mail: asdhar@mun.ca

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 4, 2016; final manuscript received July 21, 2016; published online September 28, 2016. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 139(2), 021702 (Sep 28, 2016) (8 pages) Paper No: PVT-16-1001; doi: 10.1115/1.4034408 History: Received January 04, 2016; Revised July 21, 2016

Codes/standards have been developed to calculate accurately the burst pressure for corroded pipelines. Five burst pressure models are evaluated in this paper using three-dimensional finite-element (FE) analysis. The finite-element models are validated using burst test results available in the literature. The design codes/standards are found to calculate variable burst pressures with respect to the finite-element calculations and the laboratory test results. The variability in the calculated burst pressures is attributed to the use of different flow stresses for the material and different burst pressure reduction factors for the corroded geometry. The Folias factor is considered as the major parameter contributing to the burst pressure reduction factor. Three different equations are currently used to calculate the Folias factor in the design codes that are expressed in terms of l2/(Dt). However, the finite-element evaluation presented here reveals that the Folias factor also depends on other parameters such as the defect depth.

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References

Figures

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Fig. 1

Idealization of corrosion: (a) corrosion on pipe surface, (b) cross section across the center of corrosion, and (c) longitudinal section (X–X)

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Fig. 2

Finite-element mesh: (a) full pipe and (b) zone around corroded area

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Fig. 3

Stress–strain relations for pipe materials (pipe A, C, and D): (a) pipe A, D (API 5L X60) and (b) pipe C (API 5L X65)

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Fig. 4

Burst pressure calculation using FEM (pipe A1)

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Fig. 5

Effect of the edge shape of corrosion (D = 324 mm, d/t = 0.40, and l = 528 mm)

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Fig. 6

Deformation of cross section at the midsection of corroded area (deformation is exaggerated by 50 times)

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Fig. 7

Contours of von Mises stress and principal plastic strain (D = 324 mm, d/t = 0.70, l/D = 1.63, and internal pressure = 0.66Pburst): (a) von Mises stress (N/m2) and (b) maximum principal plastic strain

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Fig. 8

Comparison of burst pressures

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Fig. 9

Comparison of burst pressure reduction factors

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