Changyi City, Shandong Province, the Yangtze River Foundry (www.changjiangzhuzao.com) is located in Weifang City, Shandong Province, eastern Shandong Changyi City Foundry, Contact: Zhang cast iron pipe fittings advantages: Because ductile iron pipe fittings with flexible joints, construction operation more convenient, improve construction efficiency, improve construction conditions, reduce construction costs, but the interface is mostly connected apron features cast iron pipe fittings, cast iron pipe fittings simple water can shorten the duration and reduce the construction cost. Ductile iron pipe fittings have to withstand high water pressure, resistance to external loads and adapt to changing geological conditions, the pipe has high strength, toughness, corrosion resistance, easy installation flexible interface, shock resistance, and low labor intensity, applied to geological poor location and across the road, without additional processing of steel, coupled with strong corrosion resistance, and can be applied to coastal saline zone. Cast iron pipe fittings embalmed 1. Asphalt bitumen paint coating lacquer coating is used to transport the gas pipeline. Preheating the pipe before painting can improve the adhesion of asphalt paint accelerate drying. 2 cement mortar lining + special anti-corrosion coating such measures applicable to the transfer of sewage pipes, can improve the corrosion resistance of the lining. 3 coal tar epoxy coating coal tar epoxy coating applied to both the gas pipeline, also applies to the sewers. It is a two component coating, the coating having a high adhesion and a very smooth surface.