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首页> 外文会议>PVP-vol.493; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >On-Line Remaining Life Assessment of Hot Reheat Pipe Bend
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On-Line Remaining Life Assessment of Hot Reheat Pipe Bend

机译：热再热管弯曲在线剩余寿命评估

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摘要

An ageing in-service Hot Reheat (HRH) pipe bend before Intermediate Pressure (IP) Stop/Control Valve of a Utility was identified for real-time creep-fatigue damage assessment. A data acquisition system has been installed to record thermal hydraulic parameters, such as pressure, temperature and flow on real time basis. The HRH piping including low pressure bypass line incorporating various supports such as directional restraints, constant weight hangers and spring hangers, was modeled using straight and bend elements. Static stress analysis was performed to find out the forces and moments at either ends of the pipe-bend for sustained and expansion loadings using piping analysis program CAESAR-II. A detailed 3-D Finite Element Model of the pipe bend was also developed using 20-noded brick elements. The 3-D FE model along with material parameters and loading are used by code BOSSES for on-line monitoring of damage. The nodal temperatures (obtained by temperature transient analysis), recorded internal pressure, associated piping loads, etc. are then used in a stress analysis module to calculate stresses at different gauss points of the pipe bend. The temperatures and stresses at different time are then used to compute fatigue and creep damage and to assess growth of different postulated cracks at various locations of pipe bend, as well as remaining life. All the information are upgraded and restart files are saved for successive computation. The real-time process data of the pipe bend are made available to the Researcher's Desk through Client-Server Network.
机译：在公用事业的中压（IP）截止/控制阀之前，已老化的运行中的热再热（HRH）弯管已被识别出来，用于实时蠕变疲劳损伤评估。已安装一个数据采集系统来实时记录热工液压参数，例如压力，温度和流量。 HRH管道包括低压旁路管线，该管线结合了各种支撑，例如方向性约束，恒重吊架和弹簧吊架，使用直线和弯曲元素进行建模。使用管道分析程序CAESAR-II进行了静应力分析，以求出弯管两端的力和弯矩，以承受持续载荷和膨胀载荷。还使用20节点砖元素开发了弯管的详细3-D有限元模型。代码BOSSES使用3-D FE模型以及材料参数和载荷对损坏进行在线监控。然后在应力分析模块中使用节点温度（通过温度瞬态分析获得），记录的内部压力，关联的管道负载等，以计算弯管在不同高斯点处的应力。然后使用不同时间的温度和应力来计算疲劳和蠕变损伤，并评估弯管在各个位置的不同假定裂纹的扩展以及剩余寿命。所有信息都将升级，并保存重新启动文件以进行后续计算。弯管的实时过程数据可通过客户端-服务器网络提供给研究人员办公桌。

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