天然气输送管道热弯钢管腐蚀缺陷的完整性评价-《焊管》

文章信息/Info

Title:: Integrality Assessment for Corrosion Defects in Hot-bend Pipe for Natural Gas Transmission Pipelines

作者:: 张忠秀¹; 安立芬¹; 陶爱莲²; 陈利华³ 编译; （1.中国石油集团渤海装备华油钢管设计研究院，河北青县062658；
2.中国石油集团渤海装备巨龙钢管有限公司，河北青县062658；
3. 中国石油集团渤海装备第一机械厂，河北青县062658）

Author(s):: Edited and Translated by ZHANG Zhong-xiu¹; AN Li-fen¹; TAO Ai-lian²; CHEN Li-hua³; (1. Huayou Steel Pipe Design and Research Institute of CNPC Bohai Equipment Manufacturing Co.,Ltd.,Qingxian 062658,Hebei,China;
2. Jvlong Steel Pipe Co.,Ltd.of CNPC Bohai Equipment Manufacturing Co.,Ltd.,Qingxian 062658,Hebei,China;
3. 1st Machinery Works of CNPC Bohai Equipment Manufacturing Co.,Ltd.,Qingxian 062658,Hebei,China)

Keywords:: hot-bend steel pipe; structural integrity assessment; corrosion defect; finite element analysis (FEA); PCORRC equation; bursting pressure

摘要:: 为了评价天然气输送管道热弯钢管腐蚀缺陷的完整性，分别对热弯钢管及含腐蚀热弯钢管进行了有限元分析（FEA）。对热弯钢管有限元分析的结果表明，应变在拉伸区域轴向为正值，在压缩区域轴向为负值，而径向应变分布却与此相反，且钢管的壁厚和应变与弯曲角无关。通过对不同壁厚、平均壁厚、含对称腐蚀缺陷以及含非对称腐蚀缺陷热弯钢管爆破压力的预测及对比，得出了将弯曲系数和平均壁厚引入用于直钢管完整性评价的PCORRC方程，可以合理预测出有腐蚀缺陷热弯钢管的爆破压力的结论。

Abstract:: In order to assess integrality of hot-bend pipe corrosion defects for natural gas transmission pipeline,finite element analysis (FEA) was separately performed to hotbend pipe and corrosive hot-bend pipe.The results showed that strain value is positive in axial tensile area,it is negative in axial compress area,while longitudinal strain distribution is in contrast,and thickness is not relevant to strain and bending angle.Through prediction and contrast to 4 kinds of bursting pressure of hot-bend pipe,different thickness,average thickness,symmetry corrosive defects and asymmetry corrosive defects,it can obtain PCORRC equation which applied bend coefficient and average wall thickness to straight steel pipe structural integrity assessment,and can get bursting pressure through reasonable prediction.