Prefabricated directly-buried polyurethane foam plastic insulation pipes More information please contact us ! Type Insulation Spiral welded steel pipesize1/2-26 inches (diameter)Wall thickness1.8mm-30mmstandardAPI5L,API5CT,ASTM-A106,ASTM-A53,SY5037-2000,GB/T5711.1-1997MaterialX42,X52,X60,X65,X70,Q235,Q345,10#,20#,45#,12CrMo,15CrMo,SS304,SS321packagingPainting,Caps,Bevel (beveled edges),Bundles or ...