城镇燃气管道和炼油、化工等企业厂区内管道的保护，不适用本法。
This Law does not apply to the protection of urban gas pipelines, and pipelines within the factory areas of oil refining, petro-chemical and other enterprises.
论述了城镇埋地燃气管道外防腐层的综合检测方法与分级评价方法。
The comprehensive detection method and the classification evaluation method for external anticorrosion coating of municipal buried gas pipeline are discussed.
分析了城镇地下燃气管道遭受第三方影响所致事故，建立了相应事故树模型。
Faults caused by third party effect on city underground gas pipeline are analyzed, and the relevant fault tree model is established.
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