海南中油深南LNG 储备库及 配套码头项目 2X20000m3LNG 储罐 置换、预冷 施 工 方 案 编制人: 审核人: 批准人: 海南中油深南LNG 储备库项目 EPC 项目经理部 2014 年 06 月 15 日 目 录 1、编制依据(Basis of compilation) ........................................................................ 1 2、工程概况(Project profile)................................................................................... 1 3、置换、预冷的目的(The purpose of displacement and precooling) .................. 1 4、氮气置换(Nitrogen displacement) .................................................................. 2 4.1 氮气置换启动前准备及检查工作(Before starting the nitrogen replacement preparation and inspection work) ......................................................................... 2 4.2 氮气质量要求(Quality of nitrogen gas)..................................................... 2 4.3 专用工具(Special tools and instruments)................................................... 3 4.4 内罐置换(The inner pot replacement) ....................................................... 3 4.5 内、外罐夹层的置换(Interlayer displacement) ........................................ 4 4.6 置换结果要求(The displacement results) .................................................. 5 5、储罐的置换与冷却(Displacement and cooling of the tank) .............................. 6 5.1 置换冷却启动前准备及检查工作(Before starting the replacement cooling preparation and inspection work) ......................................................................... 6 5.2 内罐的置换冷却(Replacement of cooling of the inner pot) ...................... 6 5.3 置换冷却结果要求(Replacement of cooling results) ................................ 9 1 1、编制依据(Basis of compilation) ➢ 《现场组装立式圆筒平底钢质液化天燃气储罐的设计与建造》GBT26978-2011 ➢ 《大型焊接低压储罐设计与建造》AP...