... the API(API5L, API5CT) and ISO Certificates .Used for oil pipeline, oil natural gas, gas, water transportation ... the API(API5L, API5CT) and ISO Certificates .Used for oil pipeline, oil natural gas, gas, water transportationoil ... ASTM,DIN,APIUsageUsed For Liquid Or Structure PIPE SurfaceBared , copper coated , Galvanized Or With OiledInspectionWith Hydraulic Testing, Eddy Current , Infrared ...