... the API(API5L, API5CT) and ISO Certificates .Used for oil pipeline, oil natural gas, gas, water ... Standard. Other Material Can Be Ordered)StandardBS, GB, ASTM,DIN,APIUsageUsed For Liquid Or Structure PIPE SurfaceBared , copper coated , ... TestSection ShapeRoundCharacteristicWith good finish ,high corrosion resistance and pressure-withstanding capacityPackingconventional package or as per to the buyer ...