Research Papers: Pipeline Systems

Improved Folias Factor and 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

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

1Corresponding authors.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received May 12, 2017; final manuscript received November 14, 2017; published online December 22, 2017. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 140(1), 011702 (Dec 22, 2017) (9 pages) Paper No: PVT-17-1086; doi: 10.1115/1.4038720 History: Received May 12, 2017; Revised November 14, 2017

Burst pressure models are used for the fitness-for-purpose assessment of energy pipelines. Existing burst pressure models for corroded pipelines are unable to predict the pipe capacity correctly. In this paper, an improved burst pressure model is developed for corroded pipelines considering the burst pressure of flawless pipes and a reduction factor due to corrosion separately. The equation for the burst pressure of flawless pipe is revised based on the theory of the thick wall cylinder. A new model for the Folias factor is proposed for calculating the reduction factor. The new model for the Folias factor incorporates the depth of corrosion defect, whereas the existing models do not account for the effect of the defect depth. The authors' earlier work revealed that the Folias factor depends on the depth of defect. The proposed burst model reasonably predicts the burst pressures obtained from finite element (FE) analysis conducted in this study and the burst test results available in the published literature.

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Fig. 1

Comparison of Folias factors obtained from FE analysis and design codes (after Mondal and Dhar [6])

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Fig. 2

Typical finite element mesh: (a) full pipe and (b) zone around corroded area

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Fig. 3

von Mises stress and the location of failure

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Fig. 4

Variations of the Folias factor

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Fig. 5

Comparison of Folias factors

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Fig. 6

Folias factors with depth of corrosion defect

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Fig. 7

Comparison of burst pressure predicted using the proposed model and FE results

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Fig. 8

Comparison of burst pressure obtained from different models

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Fig. 9

Comparison of proposed burst pressure model with test results



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