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。