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How to distinguish between flat weld flange and butt weld flange?

Flat welding and butt welding is the flange and pipe connection when the welding method, the flat welding flange welding when only one side welding does not need to weld the pipe and flange connection of the inner mouth, butt welding flange welding installation needs flange double-sided welding. So the flat welding flange is generally used for low, medium pressure pipe, butt welding flange for medium and high pressure pipe connection, butt welding flange is generally at least pn2.5ppa, using butt welding is to reduce stress concentration, the general butt welding Farrando for neck flange is also called nipple flange. Therefore, the installation of welding flange costs, labor and ancillary costs to high, because more than a process.

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