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Spiral Steel Pipe Erw Pipe Coating Pipe Thermal Insulation Steel Pipe

Spiral Welded Pipe For Heating

Taxonomy:Spiral Steel Pipe

Product number:A008

Shelf time:2014-07-08

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Product introduction

Product Name: spiral welded pipe for heat supply






Standard: CJT 3022-1993






Steel grade: Q235B






Specifications: 820 x 12 x 12000mm






Technical requirements:






Outer diameter deviation: tube body is less than or equal to 0.75%D; pipe ends are less than or equal to 0.50%D or 3.5mm, take a small value.






The thickness deviation is less than or equal to 0.1t.






Ellipticity: the maximum outer diameter is less than 1%D, and the minimum outer diameter is less than 1%D in the 1000mm length range of the pipe ends.






Length deviation: +/- 50mm;






Straightness: the full length of the steel pipe is less than 0.2%L.






Slant: less than 2mm;






Groove angle: 30 degree -35 degrees;






Blunt edge: 1.6 + /-0.8mm;






Outer weld height: less than 4.0mm;






Internal weld height: less than 4.0mm;






The hydrostatic test pressure is more than 4.1MPa, the time of stabilizing is more than 20s.






NDT: 100% weld length RT.


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JingLan(Tianjin) Technology Co., Ltd.