Study on design pressure of in-service welding pipes

作     者：XUE Xiaolong1, ZHU Jiagui2 & SANG Zhifu1 1. College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China 2. Nanjing Yangzi Petrochemical Maintenance and Installation Co. Ltd., Nanjing 210048, China 

作者机构：College of Mechanical and Power Engineering Nanjing University of Technology Nanjing Yangzi Petrochemical Maintenance and Installation Co. Ltd. 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2006年第49卷第4期

页      面：434-444页

核心收录：

学科分类：0810[工学-信息与通信工程] 080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 080201[工学-机械制造及其自动化] 

基　　金：Nanjing Tech University,NJTECH: BSCX200511 SINOPEC Petroleum Exploration and Production Research Institute,PEPRIS: 304001 

主　　题：in-service welding, heat input, flow rate, pipe wall thickness, design pressure. 

摘      要：A method of predicting design pressure and burn-through of in-service welding pipes was established. Temperature distributions of in-service welding under variable parameters were simulated by FEM. The effect of flowing of internal media was regarded as forced convection. Based on the numerical results, design pressure of the pipe can be obtained and burn-through can be predicted. It can be concluded that the design pressure decreases with the increasing of heat input. RSF and design pressure of the pipe increase with the increasing of flow rate. There is a range in which the increase changes greatly. For in-service welding, the range should be considered adequately to determine operating condition optimally. RSF increases with the increasing of pipe wall thickness. While the thickness increases to an extent, RSF shows little increase. Accord- ing to the curves of design pressure versus different parameters, safe working pressure can be achieved.