Thus, the safe operation and prolongation of the service life urgently motivate the research on the structural vibration analysis, health diagnosis and safe assessment for submarine pipelines.
因此，采用有效的技术手段对海底管道进行结构分析、监测诊断以及安全评价具有重要的理论意义和实用价值。
This paper evaluates the surplus service life of the liquefied natural gas tank by analysis of fracture mechanics, and offers the basis for the safety assessment of welding defects of the gas tank.
文对卧式液化储气罐的焊接缺陷用断裂力学的分析方法，评定了其剩余使用寿命，对大修中储气罐焊接缺陷的安全评定提供了依据。
This method can supply a basis for structural assessment and service life prediction.
这种方法可以提供一个基础结构评估和寿命预测。
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