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Importance of Block Valves in Natural Gas Pipelines

Zeng Liangquan,Fu Heping(China Petroleum Engineering Co.,Ltd.Southwest Company,Chengdu,Sichuan,610017,China)  
Analyzed is the importance of block valves equipped in natural gas pipelines entering and leaving gas treatment plants and stations,described are relative regulations in some standards and specifications at home and abroad and specific practices in domestic engineering designs,and analyzed are some reasonable design cases.
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