부식기반 복합고장을 고려한 가스배관의 신뢰도 평가 = An Assesment of the Gas Pipeline Reliability Using Corrosion based Composite Failure

다국어 초록 (Multilingual Abstract)

Purpose: The purpose of this paper is to develop a reliability estimation procedure for the underground gas pipeline in the presence of corrosion defects.
Methods: Corrosion is one of the major causes of the gas pipeline failure. Several failure forms caused by corrosion have been studied. Among them, small leak and burst are considered in this paper. The composite failure of the two is defined by limit state function, and it is expressed with pipe parameters. Given a modified corrosion dataset, in order to obtain reliability estimations, the method of first order and second moment is adopted because of its simplicity. The computation processes are conducted with MATLAB coding.
Results: According to numerical results, the probability of composite failure is affected by both small leak and burst. In particular, when corrosion depth stays at low level, it is consistent with the probability of burst failure. On the contrary, it is more influenced by the small leak failure as corrosion depth is increasing. In such case, the probability of composite failure is fast approaching to the safety limit.
Conclusion: By considering the composite failure, more practical predictions of remaining life can be obtained.
The proposed method is useful for maintenance planning of the underground gas pipeline.

참고문헌 (Reference)

1 김성준, "인더스트리 4.0을 위한 고장예지 기술과 가스배관의 사용적합성 평가" 한국품질경영학회 45 (45): 649-664, 2017

2 Melchers, R., "Structural Reliability Analysis and Prediction" Wiley 2018

3 Bazan, F., "Stochastic process corrosion growth models for pipeline reliability" 74 : 50-58, 2013

4 Seo, S. K., "Reliability Engineering" Kyobo Books 2010

5 Hasan, S., "Probability assessment of burst limit state due to internal corrosion" 89 : 48-58, 2012

6 Ossai, C., "Pipeline failures in corrosive environments – A conceptual analysis of trends and effects" 53 : 36-58, 2015

7 "PENSPEN"

8 Gomes, W., "Optimal inspection planning for onshore pipelines subject to external corrosion" 118 : 18-27, 2013

9 Dundulis, G., "Integrated failure probability estimation based on structural integrity analysis and failure data : Natural gas pipeline case" 156 : 195-202, 2016

10 "ISO 16708-2006. Reliability-based limit state methods for pipeline transportation systems in petroleum and natural gas industries"

11 Zhang, P., "Failure probability of corroded pipeline considering the correlation of random variables" 99 : 34-45, 2019

12 "CSA Z662-2007, Oil and Gas Pipeline System"

13 Cosham, A., "Best practice for the assessment of defects in pipelines" 14 : 1245-1265, 2007

14 Caleyo, F., "A study on the reliability methodology for pipelines with active corrosion defects" 79 : 77-86, 2002