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In order to ensure the safe operation of gas pipeline networks and to enable the overall reliability assessment of pipeline systems, a three-level reliability evaluation model "component-segment-pipeline network" was proposed for natural gas pipeline networks. First, the state equations of steel pipe and weld units under different failure modes were established by analyzing the composition of the pipe network line system. Combined with the Monte Carlo algorithm, the failure probability under different failure modes was calculated. Based on fault tree analysis and the minimal cut set theory, a "component-segment" level reliability model was developed, enabling the hierarchical reliability evaluation from components to pipeline segments. Next, the GO method was applied to analyze the topological structure of the pipeline network, and a structural reliability model at "segment-pipeline networ" level was established. The structural reliability of the entire pipeline network was calculated and weak segments in terms of reliability were identified rapidly. Finally, a case study was conducted to verify the accuracy and applicability of the proposed model. The results show that the reliability of pipeline network systems is positively correlated with pipe material strength and wall thickness, and negatively correlated with the diameter-to-thickness ratio and internal pressure. Compared to high-grade pipelines represented by X80, networks composed of lower-grade pipelines exhibit higher sensitivity to external factors, with their reliability being more significantly affected by external disturbances.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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