文献类型：期刊文献

英文题名：High-Temperature Defect Assessment for a P91 Reheat Elbow Using FAD and TDFAD Methods

作者：Li, Y.X.[1]; Wen, J.F.[1]; Wang, W.[2]; Zhong, W.L.[2]; Chen, J.[3]

机构：[1] Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou, 510080, China; [3] School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha, 410076, China

年份：2015

卷号：130

起止页码：1371

外文期刊名：Procedia Engineering

收录：EI(收录号：20161502237269)

语种：英文

外文关键词：Outages - Chemical industry - Risk assessment - Creep - Fracture - Damage detection

摘要：Components like elbows operating at high temperature in power and petro-chemical industry are vulnerable to failure of crack growth or net section rupture due to a change in geometry or in mode of loading. In this paper, a P91 reheat elbow subjected to internal pressure of 4.63 MPa at 569 °C for 62,952 h in service with a part-through-wall crack located at the outer surface is considered. Prediction of whether the elbow can be used for the next ten years is made. First, the procedure provided by Annex U of BS7910-2005 is employed to conduct the high-temperature defect assessment. And in this assessment, the margin against creep damage, margin against fast fracture evaluated by failure assessment diagram (FAD) and the concept of creep crack propagation are employed to estimate its safety in service. Then, a simplified assessment based on the concept of time dependent failure assessment diagram (TDFAD) is conducted. The advantage of TDFAD method is that the risk of creep rupture can be demonstrated directly by the location of assessment point on the diagram avoiding the calculation of C?. Results obtained by using the two methods are compared with each other and have both indicated that the elbow with particular crack defect can be safely operated for another ten years after the crack was discovered. ? 2015 The Authors.