Break-away coupling is a key equipment to prevent the leakage caused by the hose breaks unexpectedly. According to the filling permission rules for mobile pressure vessels, interlocking protection device shall be installed on the station to prevent pipeline pull-out. At present, there is little experience in application of break-away coupling in the loading arm, and the existing experiment is only for the individual of the break-away coupling. There are doubts about its safety and reliability, while the field testing with arm and liquid may cause damage to equipment and large-scale leakage, as well as the economic and security costs. In response to this situation, taking certaion domestic LNG load-arm break-away coupling as an example, the finite element model of break-away coupling is established by LS-DYNA, and the simulation results under the design parameters and actual working conditions are given. Several recommendations are made for the design and application of break-away coupling.%紧急拉断阀(紧急脱离装置)是防止鹤管和软管意外断裂造成泄漏事故的关键设备.根据移动式压力容器充装许可规则,装卸台要有防止装卸用管拉脱的连锁保护装置.目前装车臂安装拉断阀的应用经验较少,且现有实验仅是针对拉断阀个体进行的,人们对其安全可靠性存在疑虑,而带臂带液实地测试则冒着损坏设备以及大规模泄漏的风险,经济及安全成本较大.针对这一现状,以国产某LNG装车臂为例,利用LS-DYNA建立装车臂拉断阀的有限元模型,结合设计参数和实际工况进行仿真计算,得到了拉断阀的作用情形和规律,对拉断阀的设计及使用提出了若干建议.
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