... /4",1 1/2",2",2 1/2",3",3 1/2",4",5",6",8",10",12", ... and middle pressure fluid transportation pipeline 2. Casing Tube 3. Boiler Pipe 4. Petroleunm and natural gas industry ... 6. Electric industry Package 1. Inner package -- plain plastic bags 2. outer package -- several tubes are bundled in ... one plastic weaving bag 3. Marking: Base on your requirments 4. As ...