Abstract: A ship will be subjected to the comprehensive effect of dynamic load, static load and sudden load (such as collision load) during the operation, resulting in the extremely complicated force distribution of the saddle of the LNG fuel tank. The determination of the force distribution of the saddle is therefore critical for the design and installation of the saddle of the LNG fuel tank. A calculation method for the saddle load superposition has been proposed by studying of the force between the C-type independent fuel tank and the saddle for the dual fuel ships, combing of IGF rules and the "Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk" of CCS. This method solves the design problem of the saddle and the surrounding structure. The key points for installation are given to provide technical references for the design and the installation of this type of spherical tank's saddle.

Key words: LNG fuel tank, saddle design, load distribution, calculation method

摘要： 船舶在营运过程中会受动载荷、静载荷以及突发载荷（如碰撞载荷）的综合作用, 导致LNG燃料罐鞍座的受力分布极为复杂,所以确定鞍座的受力分布,成为LNG燃料罐鞍座设计及其安装的关键。该文通过研究双燃料船C型独立燃料罐与鞍座之间的受力方式,结合《使用气体或其他低闪点燃料船舶国际安全规则》（IGF规则）和CCS《散装运输液化气体船舶构造与设备规范》,提出了一种鞍座载荷叠加的计算方法,解决了鞍座及周边结构的设计问题。并给出了安装的注意要点。为此类球罐鞍座设计及安装提供一定的技术参考。

关键词: LNG燃料罐, 鞍座设计, 载荷分布, 计算方法