Abstract: In order to improve the energy utilization rate and prolong the life cycle of Xinjiang Mahe Gas Field，its processing plant has switched to adopt the cryogenic technology of "refrigeration by expander + RSV" to recover ethane. This is the first natural gas processing plant that produces liquid ethane in China. At present，there is no guidance specification on the storage of liquid ethane available in China. By drawing on the engineering experience in designing cryogenic tanks of LNG plant，and integrating actual engineering conditions，the key design points of mother/daughter tank process flow is justified and analyzed，and a series of engineering issues such as the cold insulation materials and indicators of mother/daughter tank and piping，and the calculation of safety radius for the plan layout of mother/daughter tank are made clear. Moreover，design framework is summarized，and practical engineering problems are solved effectively. This study provides guidance and reference for the application of medium-small-sized cryogenic tanks in the development construction of gas fields. 

Key words: liquid ethane, storage technology, ethane tank, mother/daughter tank, vapor cloud explosion, southern margin of Junggar Basin

摘要： 新疆玛河气田为了提高能源利用率，延长生命周期，处理厂调整为“膨胀机制冷+RSV（部分干气再循环）”深冷工艺回收乙烷，是国内第一座生产液态乙烷的天然气处理厂。目前国内对于液态乙烷存储尚无指导规范，工程借鉴LNG（液化天然气）工厂低温储罐经验，结合工程条件，着重论证分析子母罐流程设计要点，明确子母罐罐体及管路保冷材料和保冷指标、储罐平面布局安全半径计算方法等工程问题，总结提炼出设计框架，能够切实有效地解决工程中的实际问题。同时也为中、小型低温储罐在气田开发建设中的应用提供指导和借鉴。

关键词: 液态乙烷, 存储工艺, 乙烷储罐, 子母罐, 蒸汽云爆炸, 准噶尔盆地南缘