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中俄东线OD 1 422 mm 埋地管道的断裂控制设计
The fracture control design of the OD 1 422 mm buried pipeline in China-Russia Eastern Gas Pipeline
China-Russia Eastern Gas Pipeline
; OD 1 422 mm; failure mode; fracture control; girth weld; crack initiation toughness; crack arrest toughness; index
中俄东线天然气管道是国内首条大口径OD 1 422 mm 输气管道,途径东北严寒地区,气温较低,钢级为X80、设计压力为12 MPa,其断裂控制设计是难点。结合断裂失效模式,明确了该工程断裂失效的控制原则。根据中俄东线管输天然气组份、管道壁厚、流变应力、运行温度及管沟回填等参数,采用断裂力学理论及相关模型计算了钢管焊缝和热影响区的起裂韧性、钢管管体止裂韧性以及环焊缝的起裂韧性,制定了中俄管道的钢管和环焊缝韧性指标。从工程推荐采用的指标来看,在符合计算需求量的基础上,均有一定的裕量,能够满足管道的断裂控制要求。同时为了确保管道吊装
下沟时环焊缝安全,对管道的韧脆转变温度和下沟温度下限值提出了建议。
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