双层管道锚固件有限元分析及校核

Pipe-in-pipe Bulkhead Finite Element Analysis and Check

对于有保温要求的油气输送管道通常采用双层管型式,内外管之间设置锚固件进行连接,预防泄漏扩散的同时更有利于内外管之间的载荷传递。针对某16英寸油砂项目双层保温管道,通过结构设计、有限元设计,建立锚固件、内管、外管和保温套管的有限元模型,通过有限元分析,分别计算水压试验工况、操作工况、停产工况和事故工况下的锚固件最大应力值。计算结果显示,4种工况下的锚固件最大应力值均小于ASME规范规定的许用应力值,满足规范和应用要求。

Pipe-in-pipe are usually used for oil and gas transmission pipeline with insulation requirements. The carrier pipe and casing pipe are connected with bulkhead. It can prevent leakage from spreading and at the same time, it is conducive to the load transfer between the carrier pipe and casing pipe. Aiming at the 16 inch insulation pipe-in-pipe for oil sands project, through structural design and finite element design, the finite element model of bulkhead, carrier pipe, casing pipe and insulating sleeve were established. Through the finite element analysis, the maximum stress value of the bulkhead under the conditions of hydro test, operation, shutdown and accident were calculated. The calculation results show that the maximum stress values of bulkhead under the four working conditions are less than the allowable stress values of ASME code, which meet the requirements of the code and application.