Horizontal directional drilling is a kind of pull-tube non-excavation technology widely used in China. In order to better serve the construction of underground pipeline infrastructure in China's cities, in 2012, Saint-Gobain Musong Bridge China introduced the Yandun® horizontal directional drilling non-excavation ductile iron pipe system to China. The pipe system is composed of a ductile iron pipe, a PE sleeve and a metal sleeve coated with a fiber cement protective layer.