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由于失效评定图能反映油气管道断裂的不同形态，所以基于失效评定图的可靠性分析能确定油气管道的弹塑性断裂失效概率。文章介绍了采用可靠性指标评定管线的安全状况，提出了可靠性指标的计算方法，研究了可靠性指标的影响因素及变化规律。提出了失效评定图中的等可靠性指标线的概念，并根据油气管线工程的目标安全性水平，在失效评定图中作出了相应的等可靠性指标线，从而可以根据评定点在失效评定图中的位置，迅速确定管线的安全水平。

Reliability Analysis of Oil and Gas Pipelines on the Basis of Failure Assessment Diagram

Because the failure assessment diagram can reflect various oil and gas pipeline fracture shapes,the elastoplastic fracture failure probability of oil and gas pipelines can be determined through reliability analysis on the basis of the diagram.In the paper,adopting reliability index to assess pipeline safety condition is introduced;the calculation method of the raliability index is proposed;the influence factors and change law of the reliability index are discussed;and a concept of equal-reliability index curve on the failure assessment diagram is put forward.According to the target safety levels of pipeline engineering,relevant equal-reliability index curves may be plotted on the failure assessment diagram,thus determining rapidly the safety level of a pipeline in light of the position of assessed point on the failure assessment diagram.