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RESEARCH PAPERS

Probabilistic Integrity Assessment of Corroded Gas Pipelines

[+] Author and Article Information
Sang-Min Lee, Yoon-Suk Chang, Jae-Boong Choi

SAFE Research Center, School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyonggi-do 440-746, Korea

Young-Jin Kim1

SAFE Research Center, School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyonggi-do 440-746, Koreayjkim50@skku.edu

1

Corresponding author.

J. Pressure Vessel Technol 128(4), 547-555 (Feb 20, 2006) (9 pages) doi:10.1115/1.2349566 History: Received May 12, 2005; Revised February 20, 2006

Pressurized gas pipelines are subject to harmful effects from both the surrounding environments and the materials passing through them. Reliable assessment procedures, including fracture mechanics analyses, are required to maintain their integrity. Currently, integrity assessments are performed using conventional deterministic approaches, even though there are many uncertainties to hinder rational evaluations. Therefore, in this study, a probabilistic approach was considered for gas pipeline evaluations. The objectives are to estimate the failure probability of corroded pipelines in the gas and oil industries and to propose operating limit conditions for different types of loadings. To achieve these objectives, a probabilistic assessment program was developed using reliability index method and simulation techniques, and applied to estimate the failure probabilities of corroded API-5L-X52/X60 gas pipelines subjected to internal pressure, bending moment, and combined loading. The operating limit conditions as well as prototypal evaluation and sensitivity analysis results showed a promising applicability of the probabilistic integrity assessment program.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Flowchart of the corroded gas pipeline assessment program

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Figure 2

Failure probability results for an API-5L-X52 gas pipeline with d=3.0mm. (a) Internal pressure; (b) Bending moment.

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Figure 3

Comparison of failure probability evaluation results for an API-5L-X52 gas pipeline with d=3.0mm. (a) Internal pressure vs combined loading; (b) Bending moment vs combined loading.

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Figure 5

Operating limit conditions of combined loadings for an API-5L-X52 gas pipeline with d=3.0mm. (a) Internal pressure vs combined loading; (b) Bending moment vs combined loading.

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Figure 6

Operating limit conditions of combined loadings for an API-5L-X60 gas pipeline with d=3.0mm. (a) Internal pressure vs combined loading; (b) Bending moment vs combined loading.

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Figure 7

Comparison of failure probability results for an API-5L-X52 gas pipeline for different operation times. (a) Internal pressure; (b) Bending moment.

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Figure 8

Comparison of failure probability results for an API-5L-X60 gas pipeline for different operation times. (a) Internal pressure; (b) Bending moment.

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Figure 9

Comparison of failure probability results for an API-5L-X52 gas pipeline for different defect growth rates. (a) Internal pressure; (b) Bending moment.

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Figure 10

Comparison of failure probability results for an API-5L-X60 gas pipeline for different defect growth rates. (a) Internal pressure; (b) Bending moment.

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