Which system can produce up to Φ4000mm diameter pipes.According to different working conditions, this operating system can produce Grade 1-4pipes, rigidity: max.16KN/㎡. HWC pipes are nontoxic, corrosion-resistant, aging resistance and weather resistance(-70℃-+ 80℃), it can be landfilled above or underground, it has been widely applying in agricultural and industrial water conveyance areas.