insulation steel pipe 1.STANDARD: API 5L. ASTM 2.OD: 32MM- 1220MM 3.WT :0.7MM-20MM 4.INSULATION LAYER THICKNESS: 32MM Detailed Product Description heat insulation steel pipe 1.STANDARD: API 5L. ASTM 2.OD: 32MM- 1220MM 3.WT :0.7MM-20MM 4.INSULATION LAYER THICKNESS: 32MM Typeheat insulation steel pipesize1/2-26 inches (diameter)Wall thickness1.8mm-30mmstandardAPI5L,API5CT,ASTM-A106,ASTM-A53,SY5037- ...