1. Hot water and cold water pipe for production and domestic use; 2. Heating pipe, pipes used for heating installation on floor and wall, snow-melting devices for buildings in northern, park, airport, and so on; 3. Pipe used for solar energy water heater; 4. Coal gas and natural gas pipe; 5. Drinking water within a certain district, pipe used for reclaimed water project; 6. Piped used for central air conditioner, fan coil; 7. Industrial pipes used for oil transportation and cooling fluid; 8. Pipes used for sleeve of wire or cable; 9. Pipe/tube used for oxygen input in hospital; 10. Pipes used for irrigation project in agriculture or garden; 11. Pipes used for gas suction under condition of vacuum; 12. Tubes used in beverage factory for edible fluid