摘要
长输管道弯头、弯管的预制和安装存在着错边量大、切割弯头角度偏差过大、因弯头切割下合理而造成焊接时使母材机械性能变化、使用后弯头变形或破裂等问题。为此,提出了如下改进意见:从设计到施工,对管道每一转折点应认真测量,预制厂按实测数据弯制;预制时要在弯头、弯管两端留有一定长变的直管段;在安装中,打弯头、弯管下刀割,按编号“对号入座”;直缝钢管弯制时,应将焊缝置于中性轴线上;用有环向焊缝的直缝管弯制时,其直焊缝应相互交错且与中性轴成30°错开。
Prefabrication and installation of elbows and bends for long distance pipeline may encounter such problems as considerable offset.big deviation of bending angle,variation of material properties during welding due to improper bend cutting,and deformation or damage undertaking during service. It is pointed out that care shall be taken from design to construction to every turning point over the line and elbows and bends prefabricated accodingly. Straight sections of proper length shall be reserved during prefabrication at both ends of the elbows and bends. Every elbow or bend shall be installed in its own place with no need for cutting. When bending pipes of longitudinal weld,the weld shall be positioned along the natural axial line,or,if the pipe has a girth weld,with a 30?cross angle with the natural axial.
出处
《油气储运》
CAS
北大核心
1996年第3期23-24,共2页
Oil & Gas Storage and Transportation
关键词
长输管道
弯接头
弯管
预制
安装
油气管
long distance pipeline,bent sub,elbow,prefabrication,installation
