Our introduction of a new national standard "GB13295-2008 water and gas pipes with ductile iron pipe,pipe fittings and accessories","GB50028X2006City Gas Design Code'.the product can be used not only cities and towns of the pressure of natural gas and gas transmission and distribution underground pipe network,but also widely used in water,oil pipelines,as well as food,pharmaceutical and chemical industry production process pipe network. Companies in strict accordance with the ISO9001 quality system standard to build the product quality system,using advanced equipment and latest technology to provide users with reliaable quality assurance.