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http://dx.doi.org/10.7842/kigas.2020.24.4.10

Failure Probability Assessment of Natural Gas Pipeline under Combined Stresses  

Baek, Jong-Hyun (KOGAS Research Institute)
Chang, Yun-Chan (KOGAS Research Institute)
Kim, Ik-Jung (KOGAS Research Institute)
Kim, Cheol-Man (KOGAS Research Institute)
Kim, Young-Pyo (KOGAS Research Institute)
Publication Information
Journal of the Korean Institute of Gas / v.24, no.4, 2020 , pp. 10-17 More about this Journal
Abstract
The structural reliability assessment can be used to improve the reliability in the asset integrity management of the pipeline by using a geometric variation, mechanical characteristics, load change and operating condition as evaluation factors. When evaluating structural reliability, the failure probability of the natural gas pipe is evaluated by the relationship of the resistance of the pipe material to external loads. The failure probability of the natural gas pipe due to the combined stresses such as the internal pressure, thermal stress and bending stress was evaluated by using COMREL program. When evaluating the failure probability of the natural gas pipe, a buried depth of 1.5 to 30 m, a wheel load of 2.5 to 20 ton, a temperature difference of 45℃, an operating pressure of 6.86MPa, and a soil density of 1.8 kN/㎥ were used. The failure probabilities of the natural gas pipe were evaluated by the Von-Mises stress criterion as the maximum allowable stress criterion under the combined stresses.
Keywords
combined stresses; failure probability; natural gas pipe; structural reliability;
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