摘要
FAC造成二回路管道的壁厚减薄,致使管道的强度降低,当管道减薄到一定程度时,管道会发生破裂,容易引起严重的安全事故。本文针对管道FAC壁厚减薄问题,建立了完整的分析评定路线。重点介绍以API579指导实现的壁厚减薄Level 3评定方法:利用有限元软件ANSYS的APDL参数化建模功能,建立了直管、弯头、大小头的参数化模型,该方法可方便定义管道的几何参数和材料参数、管端载荷和约束,通过直接调用在役检测的壁厚检测数据,自动建立管道的FAC壁厚减薄的真实壁厚模型。并利用极限载荷法评定壁厚减薄管道的强度,实现了API579壁厚减薄体积型缺陷的Level 3评定。
Background： Flow Accelerated Corrosion （FAC） leads to wall thinning （metal lose） and strength reduction of steel piping. Piping degradation due to FAC can affect plant reliability and may cause serious accident. Purpose： This paper sets up the analysis and assessment method for the wall thinning due to FAC. Methods： This method mainly bases on local metal loss Level 3 of API 579. Using FEA software ANSYS develop parameterized models, including straight pipe, elbow, reducer, etc. The models can be expediently defined geometry and material parameter, load and constraint condition. Furthermore, the real thickness model of the pipe can be established by using the data of in-service inspection. Results： With the limit-load analysis method to assessment the strength of piping, the method achieved local metal loss Level 3 assessment effectively. Conclusions： Using this method to establish the true model of pipe wall thickness, can improve the accuracy of analysis of pipe wall thickness thinning evaluation.
出处
《核技术》
CAS
CSCD
北大核心
2013年第4期287-291,共5页
Nuclear Techniques
