If you need steel pipe with the strong strength to resist internal pressure, you are advised to use welded steel pipe. The high strength of steel will contribute to lightweight pipe to make it easier to resist internal pressure. When the steel pipe is not pressurized, it also can resist external pressure actually. The minimum yield strength of most pipe-grade steel is 290 MPa, while higher strength steels are available. Steel pressure pipe requires no thrust blocks at special sections, like elbows, tees and so forth since joints can be welded.http://www.navetc-group.com/valve/
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