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Application of vacuum technology in direct buried steam pipe with steel jacket

By Yang Fan , Ye Yong and Wang Songtao China University of Mining and Technology (Beijing), Beijing, China  
Describes the advantages of vacuum technology. Presents the pipe structure, pipe welding, sealing method of divided section, valves, tees etc., the requirement of pipe vacuum and pipe installation. Takes a project as an example to illuminate that using vacuum technology in the steel jacket pipe can reduce the heat loss and the surface temperature of pipe.
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