1.process :Butt-welded&Overlap 2.cold or hot water,gas series 3.ISO,CE,AENOR ... aluminum and plastic .1.process :Butt-welded&Overlap2.cold or hot water,gas series3.ISO,CE,AENOR, EMI certificate4 ... cooling fluid;8. Pipes used for sleeve of wire or cable;9. Pipe/tube used for oxygen input ... hospital;10. Pipes used for irrigation project in agriculture or garden;11. Pipes used for gas suction under condition ...