摘要
管道打孔现象作为第三方破坏的主要形式威胁着油气输送管道的安全运行。焊接接管是一种常见的管道盗孔修复补强方法,但焊接接管导致管道几何形状突变,破坏了原有的应力分布。建立管道盗孔接管修复结构的有限元模型,运用非线性有限元方法对管道在内压载荷作用下的应力分布进行了计算。研究结果表明:焊接接管导致了管道开孔附近区域局部应力集中,且随内压增加应力集中面积逐渐加大;最大应力点出现在管道开孔0o处(管道开孔内壁轴向位置);在保证焊接工艺的情况下,较小的接管管径、与管道主体壁厚相近的接管壁厚具有更好的修复效果。
The safe operation of oil and gas pipeline has been threatened by drilled hole phenomenon as the main form of third party damage. Welding nozzle is a common repair and reinforcement method of pipeline with drilled hole. But this method causes the geometry mutation of pipeline and destroys the stress distribution. The finite element model of nozzle repair structure for pipeline with drilled hole was established. Furthermore,the stress distribution of pipeline under internal pressure load was also calculated by using the nonlinear finite element method.The results showed that the welding nozzle caused the local stress concentration near the area of opening hole,and the area of stress concentration increased with the increase of internal pressure. The maximum stress occurs at 0o position of the opening hole（ axial position in the internal wall of opening hole）. The smaller diameter of nozzle and the wall thickness of nozzle similar to the main pipeline can acquire the better repair effect under the condition of ensuring the welding process.
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2015年第7期18-22,共5页
Journal of Safety Science and Technology
关键词
管道开孔
接管
应力集中
最优尺寸
有限元方法
pipeline opening hole
nozzle
stress concentration
optimal size
finite element method
