Abstract：Welding slags, iron dusts and other foreign matter appear during liquefied natural gas (LNG) pipeline construction. Such materials need to be removed by cleaning or purging so as to meet the cleaning requirements. Through the use of air purge scheme during pipeline construction, we summarize the air source selection schemes. According to different air sources, different methods can be adopted to complete the cleaning of the main pipeline and branches. According to the theory of drag force, evaluation of air blowing effectiveness is demonstrated. Based on cleaning criteria, one can determine whether or not the pipeline achieves acceptance requirements. This research will provide reference for the pipeline construction using air purge scheme.
1 魏玉垒,庄阳,焦茗,等. LNG管道模块化建造中的清洁干燥［J］. 石油和化工设备, 2016, 19(11)： 65.
Wei Yu-lei, Zhuang Yang, Jiao Ming, et al. LNG pipeline Modular construction in the clean and dry ［J］. Petro & Chemical Equipment, 2016, 19(11)： 65.
2 迟省利,刘思,宁会朋,等. 管道试压后的清洁干燥及改进设计研究［J］. 中国造船, 2013, 54(S2)： 474.
Chi Sheng-li, Liu Si, Ning Hui-peng, et al. Study on cleaning, drying and improved design after pipeline ressure test ［J］. Shipbuilding of China, 2013, 54(S2)： 474.
3 Cranfield R R, Lawrence J. Pipework purging by water flushing ［J］. Proceedings of the Institution of Mechanical Engineers, 1973, 187(1)： 801.
4 常景龙,苏宏春,张黎霞,等. 新建天然气管道的除水与干燥技术［J］. 油气储运, 2001, 20(12)： 5.
Chang Jing-long, Su Hong-chun, Zhang Li-xia, et al. The pipeline drying and dewatering technology for precommissioning natural gas transmission pipeline ［J］. Oil & Gas Storage and Transportation, 2001, 20(12)： 5.
5 宋小琴,朱珊珊. 龙忠输气管道应用复合干燥法的可行性［J］. 油气储运, 2004, 23(6)： 35.
Song Xiao-qin, Zhu Shan-shan. The application of compound desiccation method in Longmen-Zhongxian natural gas pipeline ［J］. Oil & Gas Storage and Transportation, 2004, 23(6)： 35.
6 袁克峰,崔慧娟,叶树满,等. 变径清管器在西—联管线上的应用［J］. 管道技术与设备, 2005(2)： 42.
Yuan Ke-feng, Cui Hui-juan, Ye Shu-man, et al. Application of diameter-changing pig to the West-Union pipeline［J］. Pipeline Technique and Equipment, 2005(2)： 42.
