首页>
外国专利>
RENEWAL CONSTRUCTION METHOD FOR GAS FEED SERVICE PIPE
RENEWAL CONSTRUCTION METHOD FOR GAS FEED SERVICE PIPE
展开▼
机译:煤气给水管道的更新施工方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
PURPOSE:To perform airtightness test at a time and dispense with air purge before and after exchanging new and old pipes. CONSTITUTION:Gas pressure is applied on a secondary side piping 5 by utilizing a gas bomb 14, at exchanging new and old pipes gas pressure is applied on the secondary side piping 5 and gas is continued to flow little by little, simultaneously gas is continued to flow little by little from a primary side piping to the old pipe side, and changeover and joint of the new pipe 4 and the secondary side piping 5 is performed.
展开▼