... 3.Coating:PE; 3PE; FBE; Black Tube,API 5L,ERW Pipe's Black Tube,API 5L,ERW Pipe's Specifications:1.Gradl: GR.B ... , visual inspection, nondestructive inspection; SGS/BVBlack Tube,API 5L,ERW Pipe's Black Tube,API 5L,ERW Pipe's Available Designation: STANDARDGRADEAPPLICATIONAPI 5CTJ55,K55 ... GR.1/2/3 Black Tube,API 5L,ERW Pipe's Black Tube,API 5L,ERW Pipe's Prosessing Photo: Black Tube,API 5L,ERW ...