... .process :Butt-welded&Overlap 2.cold or hot water,gas series 3.ISO,CE,AENOR, EMI certificate 4.high quality,favourable ... devices for buildings in northern, park, airport,and so on;3. Pipe used for solar energy water heater;4. Coal gas and ... certain district, pipe used for reclaimedwater project;6. Piped used for central air conditioner, fan coil;7. Industrial pipes used for oil transportation and ...